OBD systems are found in most vehicles in use today. OBD is an electronic system designed to control engine functions and diagnose engine problems or component failures, as well as minimize emissions. OBD-II, a new standard introduced in cars built after January 1, 1996, provides almost complete engine control and also monitors parts of the chassis, body and accessory components, as well as the diagnostic control network of the vehicle.

OBD-II equipped vehicles have a connector located in the passenger compartment, usually accessible from the driver's seat (under the dash above the hood release lever in the Grand Cherokee WJ). A cable is plugged into the OBD-II connector and connected to a scanning tool. This can range from a simple hand-held meter that provides a coded read-out of the various diagnostic functions, up to a large console computer-based unit costing thousands of dollars.

Fault codes usually appear after the "Check Engine" light has come on. The data provided by the OBD-II system can sometimes pinpoint the specific component that has malfunctioned, saving substantial service time and cost. Scanning OBD-II signals can also provide important information when purchasing a used vehicle. Recent introductions of less costly scanning devices have allowed home mechanics and small shops accessibility to OBD-II signals to use them for their own testing and repairs.

Malfunction Indicator Lamp (MIL)

In the Grand Cherokee WJ, the MIL gives an indication to the vehicle operator when the Powertrain Control Module (PCM) has recorded a Diagnostic Trouble Code (DTC) for an On-Board Diagnostics II (OBDII) emissions-related circuit or component malfunction. The MIL is controlled by a transistor on the instrument cluster circuit board based upon cluster programming and electronic messages received by the cluster from the PCM over the Programmable Communications Interface (PCI) data bus.

The MIL bulb is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the bulb will always be off when the ignition switch is in any position except On or Start. The bulb only illuminates when it is provided a path to ground by the instrument cluster transistor.

The instrument cluster will turn on the MIL for the following reasons:

BULB TEST - Each time the ignition switch is turned to the On position the MIL is illuminated for about three seconds as a bulb test.

MIL LAMP-ON MESSAGE - Each time the cluster receives a MIL lamp-on message from the PCM, the indicator will be illuminated. The indicator can be flashed on and off, or illuminated solid, as dictated by the PCM message. For some DTC�s, if a problem does not recur, the PCM will send a lamp-off message automatically. Other DTC�s may require that a fault be repaired and the PCM be reset before a lamp-off message will be sent.

COMMUNICATIONS ERROR - If the cluster receives no lamp-on or lamp-off messages from the PCM for twenty consecutive seconds, the MIL is illuminated by the instrument cluster. The indicator remains controlled and illuminated by the cluster until a valid lamp-on or lamp-off message is received from the PCM.

MIL illumination

In many instances, emissions systems must fail diagnostic tests more than once before the PCM illuminates the MIL. These tests are know as 'two trip monitors.' Other tests that turn the MIL lamp on after a single failure are known as 'one trip monitors.' A trip is defined as 'start the vehicle and operate it to meet the criteria necessary to run the given monitor.'

Certain conditions such as a loose or missing gas cap, poor fuel quality, etc. may illuminate the light after engine start. The vehicle should be serviced if the light stays on through several typical driving cycles. In most situations, the vehicle will drive normally and will not require towing.

Prolonged driving with the "Malfunction Indicator Light" or "Check Engine" light on could cause further damage to the emission control system. It could also affect fuel economy and driveability. The vehicle must be repaired before any emissions test can be performed.

If the light is flashing, severe catalytic converter damage and power loss will soon occur. Immediate service is required.

Retrieving codes:

Turn the ignition key until the digital odometer displays, repeat three times in succession and then back to "On" (On/Off, On/Off, On/Off, On). At the fourth "On" the odometer will be replaced with codes. If no codes are present then "Done" will appear.

Erasing codes:

After three good trips the MIL is extinguished and the Task Manager automatically switches the trip counter to a warm-up cycle counter. DTCs are automatically erased following 40 warm-up cycles if the component does not fail again.

DTCs can be erased anytime with a DRB III. Erasing the DTC with the DRB III erases all OBD II information. The DRB III automatically displays a warning that erasing the DTC will also erase all OBD II monitor data. This includes all counter information for warm-up cycles, trips and Freeze Frame.

OBD-II related links:

OBD-II Trouble Codes repair site

Facts About On-Board Diagnostic II Systems

The workings of OBD-II and its effect on modifications

OBD Scan Tools - Automotive Diagnostics

Scan Code

DRB Scan Tool Display

Description of Diagnostic Trouble Code

P0010

A Camshaft Position Actuator Circuit (Bank 1)

P0011

A Camshaft Position - Timing Over-Advanced or System Performance (Bank 1))

P0012

A Camshaft Position - Timing Over-Retarded (Bank 1)

P0013

B Camshaft Position - Actuator Circuit (Bank 1)

P0014

B Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)

P0015

B Camshaft Position - Timing Over-Retarded (Bank 1)

P0016

Crankshaft/Camshaft Timing Misalignment

A rationality error has been detected for camshaft position out of phase with crankshaft.

P0020

A Camshaft Position Actuator Circuit (Bank 2)

P0021

A Camshaft Position - Timing Over-Advanced or System Performance (Bank 2)

P0022

A Camshaft Position - Timing Over-Retarded (Bank 2)

P0023

B Camshaft Position - Actuator Circuit (Bank 2)

P0024

B Camshaft Position - Timing Over-Advanced or System Performance (Bank 2)

P0025

B Camshaft Position - Timing Over-Retarded (Bank 2)

P0030

02 Sensor Heater Control Circuit (Bank 1 Sensor 1)

Shorted condition detected in the oxygen sensor heater element control feedback sense circuit.

P0031

02 Sensor Heater Control Circuit Low (Bank 1 Sensor 1)

Shorted low condition detected in the oxygen sensor 1/1 heater elementcontrol feedback sense circuit

P0032

02 Sensor Heater Control Circuit High (Bank 1 Sensor 1)

Shorted high condition detected in the oxygen sensor 1/1 heater element control feedback sense circuit

P0033

Turbo Charger Bypass Valve Control Circuit

P0034

Turbo Charger Bypass Valve Control Circuit Low

P0035

Turbo Charger Bypass Valve Control Circuit High

P0036

02 Sensor Heater Control Circuit (Bank 1 Sensor 2)

Shorted condition detected in the oxygen sensor heater element control feedback sense circuit.

P0037

02 Sensor Heater Control Circuit Low (Bank 1 Sensor 2)

Shorted condition detected in the oxygen sensor heater element control feedback sense circuit.

P0038

02 Sensor Heater Control Circuit High (Bank 1 Sensor 2)

Shorted condition detected in the oxygen sensor heater element control feedback sense circuit.

P0042

02 Sensor Heater Control Circuit (Bank 1 Sensor 3)

Shorted condition detected in the oxygen sensor heater element control feedback sense circuit.

P0043

02 Sensor Heater Control Circuit Low (Bank 1 Sensor 3)

Shorted condition detected in the oxygen sensor heater element control feedback sense circuit.

P0044

02 Sensor Heater Control Circuit High (Bank 1 Sensor 3)

Shorted condition detected in the oxygen sensor heater element control feedback sense circuit.

P0050

02 Sensor Heater Control Circuit (Bank 2 Sensor 1)

Shorted condition detected in the oxygen sensor heater element control feedback sense circuit.

P0051

02 Sensor Heater Control Circuit Low (Bank 2 Sensor 1)

Shorted condition detected in the oxygen sensor heater element control feedback sense circuit.

P0052

02 Sensor Heater Control Circuit High (Bank 2 Sensor 1)

Shorted condition detected in the oxygen sensor heater element control feedback sense circuit.

P0056

02 Sensor Heater Control Circuit (Bank 2 Sensor 2)

Shorted condition detected in the oxygen sensor heater element control feedback sense circuit.

P0057

02 Sensor Heater Control Circuit Low (Bank 2 Sensor 2)

Shorted condition detected in the oxygen sensor heater element control feedback sense circuit.

P0058

02 Sensor Heater Control Circuit High (Bank 2 Sensor 2)

Shorted condition detected in the oxygen sensor heater element control feedback sense circuit.

P0062

02 Sensor Heater Control Circuit High (Bank 2 Sensor 2)

Shorted condition detected in the oxygen sensor heater element control feedback sense circuit.

P0063

HO2S Heater Control Circuit Low (Bank 2 Sensor 3)

Shorted condition detected in the oxygen sensor heater element control feedback sense circuit.

P0064

HO2S Heater Control Circuit High (Bank 2 Sensor 3)

Shorted condition detected in the oxygen sensor heater element control feedback sense circuit.

P0065

Air Assisted Injector Control Range/Performance

P0066

Air Assisted Injector Control Circuit or Circuit Low

P0067

Air Assisted Injector Control Circuit High

P0068

Manifold Pressure/Throttle Position

Correlation MAP sensor signal does not correlate to throttle position sensor signal. Possible vacuum leak.

P0070

Ambient Temp Sensor Stuck

A rationality error has been detected in the ambient temperature sensor test.

P0071 (M)

Ambient Temp Sensor Performance

Ambient change less than 3° C in 200 miles.

P0072

Ambient Temp Sensor Low Input

Ambient temperature sensor input below the minimum acceptable voltage.

P0073

Ambient Temp Sensor High Input

Ambient temperature sensor input above the maximum acceptable voltage.

P0074

Ambient Air Temperature Sensor Circuit Intermittent

P0075

Intake Valve Control Solenoid Circuit (Bank 1)

P0076

Intake Valve Control Solenoid Circuit Low (Bank 1)

P0077

Intake Valve Control Solenoid Circuit High (Bank 1)

P0078

Exhaust Valve Control Solenoid Circuit (Bank 1)

P0079

Exhaust Valve Control Solenoid Circuit Low (Bank 1)

P0080

Exhaust Valve Control Solenoid Circuit High (Bank 1)

P0081

Intake valve Control Solenoid Circuit (Bank 2)

P0082

Intake Valve Control Solenoid Circuit Low (Bank 2)

P0083

Intake Valve Control Solenoid Circuit High (Bank 2)

P0084

Exhaust Valve Control Solenoid Circuit (Bank 2)

P0085

Exhaust Valve Control Solenoid Circuit Low (Bank 2)

P0086

Exhaust Valve Control Solenoid Circuit High (Bank 2)

Scan Code

DRB Scan Tool Display

Description of Diagnostic Trouble Code

P0100

Mass or Volume Air Flow Circuit

P0101

Mass or Volume Air Flow Circuit Range/Performance Problem

P0102

Mass or Volume Air Flow Circuit Low Input

P0103

Mass or Volume Air Flow Circuit High Input

P0104

Mass or Volume Air Flow Circuit Intermittent

P0105

Manifold Absolute Pressure/Barometric Pressure Circuit

P0106 (M)

Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem

MAP sensor input voltage out of an acceptable range detected during reading of barometric pressure at key-on.

P0107 (M)

Manifold Absolute Pressure/Barometric Pressure Circuit Low Input

MAP sensor input below minimum acceptable voltage.

P0108 (M)

Manifold Absolute Pressure/Barometric Pressure Circuit High Input

MAP sensor input above maximum acceptable voltage.

P0109

Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent

P0110

Intake Air Temp Sensor Stuck

A rationality error has been detected for the intake air temperature sensor.

P0111 (M)

Intake Air Temperature Circuit Range/Performance Problem

Air change less than 3° C in 200 miles.

P0112 (M)

Intake Air Temperature Circuit Low Input

Intake air (charge) temperature sensor input below the minimum acceptable voltage.

P0113 (M)

Intake Air Temperature Circuit High Input

Intake air (charge) temperature sensor input above the maximum acceptable voltage.

P0114

Intake Air Temperature Circuit Intermittent

P0115

Engine Coolant Temperature Circuit

P0116

Engine Coolant Temperature Circuit Range/Performance Problem

A rationality error has been detected in the coolant temperature sensor.

P0117 (M)

Engine Coolant Temperature Circuit Low Input

Engine coolant temperature sensor input below the minimum acceptable voltage.

P0118 (M)

Engine Coolant Temperature Circuit High Input

Engine coolant temperature sensor input above the maximum acceptable voltage.

P0119

Engine Coolant Temperature Circuit Intermittent

Engine coolant temperature sensor input above the maximum acceptable voltage.

P0120

Throttle/Pedal Position Sensor/Switch A Circuit

Engine coolant temperature sensor input above the maximum acceptable voltage.

P0121 (M)

Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance Problem

TPS signal does not correlate to MAP sensor signal.

P0121 (M)

Accelerator Position Sensor (APPS)

APPS voltage input below the minimum acceptable voltage.

P0122 (M)

Throttle/Pedal Position Sensor/Switch A Circuit Low Input

Throttle position sensor input below the acceptable voltage range.

P0122 (M)

Accelerator Position Sensor (APPS) Signal Voltage Too Low

APPS voltage input below the minimum acceptable voltage.

P0123 (M)

Throttle/Pedal Position Sensor/Switch A Circuit Intermittent

Throttle position sensor input above the maximum acceptable voltage. Follow all appropriate diagnostics for the fault that is present. Prior to replacing parts, check all connectors between the speed control switch and the PCM for moisture Internally the PCM uses the same A/D (analog to digital) converter for TPS voltage as it does for the speed control switch sense. If the v-37 circuit has voltage bleed over from another source, a code of TPS Shorted to voltage may be set in the PCM. The DN model equipped with rear heat option, has an external water pump to circulate coolant to the rear heater. If you find coolant in the bulkhead connector, the likely cause would be a leaking coolant pump. Pump should be replaced if found leaking. If the code sets when the A/C is turned on go right to the bulk head connector and check for moisture. Check for a shorted clock spring causing the speed control 5 volt feed to be shorted to power.

P0123 (M)

Accelerator Position Sensor (APPS) Signal Voltage Too High

APPS voltage input above the maximum acceptable voltage.

P0125 (M)

Insufficient Coolant Temperature for Closed Loop Fuel Control

Time to enter Closed Loop Operation (Fuel Control) is excessive.

P0125 (M)

Engine is Cold Too Long

Engine does not reach operating temperature.

P0126

Insufficient Coolant Temperature for Stable Operation

P0127

Intake Air Temperature Too High

P0128

Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

A rationality error has been detected for the thermostat.

P0129

Barometic Pressure Out-of-Range low

MAP sensor input voltage out of an acceptable range detected during reading of barometric pressure.

P0130

O2 Sensor Circuit (Bank 1 Sensor 1)

An open or shorted condition detected in the ASD or CNG shutoff relay control ckt.

P0131 (M)

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)

Oxygen sensor input voltage maintained below normal operating range.

P0132 (M)

O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)

Oxygen sensor input voltage maintained above normal operating range.

P0133 (M)

O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)

Oxygen sensor response slower than minimum required switching frequency.

P0134 (M)

O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)

Neither rich or lean condition is detected from the oxygen sensor input.

P0135 (M)

O2 Sensor Heater Circuit (Bank 1 Sensor 1)

Oxygen sensor heater element malfunction.

P0136

O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)

An open or shorted condition detected in the ASD or CNG shutoff relay control ckt.

P0137 (M)

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)

Oxygen sensor input voltage maintained below normal operating range.

P0138 (M)

O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)

Oxygen sensor input voltage maintained above normal operating range.

P0139 (M)

OS Sensor Circuit Slow Response (Bank 1 Sensor 2)

Oxygen sensor response not as expected.

P0140 (M)

O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)

Neither rich or lean condition is detected from the oxygen sensor.

P0141 (M)

O2 Sensor Heater Circuit (Bank 1 Sensor 2)

Oxygen sensor heater element malfunction. O2 sensor voltage greater than 3 volts for 60 to 240 seconds.

P0142 (M)

Sensor Circuit Malfunction (Bank 1 Sensor 3)

Oxygen sensor heater element malfunction.

P0143

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)

Oxygen sensor input voltage maintained below normal operating range.

P0144

O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)

Oxygen sensor input voltage maintained above normal operating range.

P0145

O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)

Oxygen sensor response slower than minimum required switching frequency.

P0146

O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)

Neither rich or lean condition is detected from the oxygen sensor.

P0147

O2 Sensor Heater Circuit (Bank 1 Sensor 3)

Oxygen sensor heater element malfunction.

P0148

Fuel Delivery Error

P0149

Fuel Timing Error

P0150

O2 Sensor Circuit (Bank 2 Sensor 1)

P0151 (M)

O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1)

Oxygen sensor input voltage maintained below normal operating range.

P0152 (M)

O2 Sensor Circuit High Voltage (Bank 2 Sensor 1)

Oxygen sensor input voltage sustained above normal operating range.

P0153 (M)

O2 Sensor Circuit Slow Response (Bank 2 Sensor 1)

Oxygen sensor response slower than minimum required switching frequency.

P0154 (M)

O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)

Neither rich or lean condition is detected from the oxygen sensor.

P0155 (M)

O2 Sensor Heater Circuit (Bank 2 Sensor 1)

Oxygen sensor heater element malfunction.

P0156 (M)

O2 Sensor Circuit Malfunction (Bank 2 Sensor2)

Oxygen sensor heater element malfunction.

P0157 (M)

O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)

Oxygen sensor input voltage maintained below normal operating range.

P0158 (M)

O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)

Oxygen sensor input voltage maintained above normal operating range.

P0159

O2 Sensor Circuit Slow Response (Bank 2 Sensor 2)

Oxygen sensor response slower than minimum required switching frequency.

P0160 (M)

O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)

Neither rich or lean condition is detected from the oxygen sensor.

P0161 (M)

O2 Sensor Heater Circuit (Bank 2 Sensor 2)

Oxygen sensor heater element malfunction. O2 sensor voltage greater than 3 volts for 60 to 240 seconds.

P0162 (M)

O2 Sensor Circuit Malfunction (Bank 2 Sensor 3)

Oxygen sensor heater element malfunction.

P0163 (M)

O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3)

P0164 (M)

O2 Sensor Circuit High Voltage (Bank 2 Sensor3)

P0165

O2 Sensor Circuit Slow Response (Bank 2 Sensor 3)

P0166

O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3)

P0167

OS Sensor Heater Circuit (Bank 2 Sensor 3)

P0168

Fuel Temperature Too High

P0169

Incorrect Fuel Composition

P0170

Fuel Trim (Bank 1)

P0171 (M)

System too Lean (Bank 1)

A lean air/fuel mixture has been indicated by an abnormally rich correction factor.

P0172 (M)

System too Rich (Bank 1)

A rich air/fuel mixture has been indicated by an abnormally lean correction factor. Was the fuel pressure checked with a DRBIII pressure transducer? Is the fuel pressure within specification with engine running at normal operating temperature? Verify the correct DRBIII PEP module pressure transducer is being used It is critical when reading pressures with the DRBIII PEP module pressure transducers that the proper transducer is being used. A too high of value transducer will cause inaccurate readings. It is also critical that the DRBIII and pressure transducer is zeroed out before taking a reading.Repair or replace any fuel system malfunctioning components.

P0173 (M)

Fuel Trim Malfunction (Bank 2)

P0174 (M)

System too Lean (Bank 2)

A lean air/fuel mixture has been indicated by an abnormally rich correction factor.

P0175 (M)

System too Rich (Bank 2)

A rich air/fuel mixture has been indicated by an abnormally lean correction factor.

P0176

Fuel Composition Sensor Circuit

No calibration voltage present from flex fuel sensor.

P0177

Fuel Composition Sensor Circuit Range/Performance

P0178

Fuel Composition Sensor Circuit Low Input

Flex fuel sensor input below minimum acceptable voltage.

P0178

Water in Fuel Light�Water In Fuel Sensor Voltage Too Low

Loss of water-in-fuel circuit or sensor.

P0179

Fuel Composition Sensor Circuit High Input

Flex fuel sensor input above maximum acceptable voltage.

P0180

Fuel Temperature Sensor A Circuit

P0181

Fuel Temperature Sensor A Circuit Range/Performance

P0182 (M)

Fuel Temperature Sensor A Circuit Low Input

Compressed natural gas temperature sensor voltage below acceptable voltage

P0183 (M)

Fuel Temperature Sensor A Circuit High Input

Compressed natural gas temperature sensor voltage above acceptable voltage

P0184

Fuel Temperature Sensor A Circuit Intermittent

P0185

Fuel Temperature Sensor B Circuit

P0186

Fuel Temperature Sensor B Circuit Range/Performance

P0187

Fuel Temperature Sensor B Circuit Low Input

P0188

Fuel Temperature Sensor B Circuit High Input

P0189

Fuel Temperature Sensor B Circuit Intermittent

P0190

Fuel Rail Pressure Sensor Circuit

P0191

Fuel Rail Pressure Sensor Circuit Range/Performance

P0192

Fuel Rail Pressure Sensor Circuit Low Input

P0193

Fuel Rail Pressure Sensor Circuit High Input

P0194

Fuel Rail Pressure Sensor Circuit Intermittent

P0195

Engine Oil Temperature Sensor

P0196

Engine Oil Temperature Sensor Range/Performance

P0197

Engine Oil Temperature Sensor Low

P0198

Engine Oil Temperature Sensor High

P0199

Engine Oil Temperature Sensor Intermittent

Scan Code

DRB Scan Tool Display

Description of Diagnostic Trouble Code

P0200

Injector Circuit

P0201 (M)

Injector # 1 Control Circuit

An open or shorted condition detected in control circuit for Injector # 1 or the INJ 1 injector bank.

P0202 (M)

Injector # 2 Control Circuit

An open or shorted condition detected in control circuit for Injector # 2 or the INJ 2 injector bank.

P0203 (M)

Injector # 3 Control Circuit

An open or shorted condition detected in control circuit for Injector # 3 or the INJ 3 injector bank.

P0204 (M)

Injector # 4 Control Circuit

Injector # 4 or INJ 4 injector bank output driver stage does not respond properly to the control signal.

P0205 (M)

Injector # 5 Control Circuit

Injector # 5 output driver stage does not respond properly to the control signal.

P0206 (M)

Injector # 6 Control Circuit

Injector # 6 output driver stage does not respond properly to the control signal.

P0207 (M)

Injector # 7 Control Circuit

Injector # 7 output driver stage does not respond properly to the control signal.

P0208 (M)

Injector # 8 Control Circuit

Injector # 8 output driver stage does not respond properly to the control signal.

P0209 (M)

Injector # 9 Control Circuit

Injector # 9 output driver stage does not respond properly to the control signal.

P0210 (M)

Injector # 10 Control Circuit

Injector # 10 output driver stage does not respond properly to the control signal.

P0211

Injector Circuit - Cylinder 11

P0212

Injector Circuit - Cylinder 12

P0213

Cold Start Injector 1

P0214

Cold Start Injector 2

P0215

Engine Shutoff Solenoid

P0216 (M)

Injector/Injection Timing Control Circuit

P0217

Engine Coolant Over Temperature Condition

P0218

Transmission Fluid Over Temperature Condition

P0219

Engine Overspeed Condition

P0220

Throttle/Pedal Position Sensor/Switch B Circuit

P0221

Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance Problem

P0222 (M)

Throttle/Pedal Position Sensor/Switch B Circuit Low Input

P0223 (M)

Throttle/Pedal Position Sensor/Switch B Circuit High Input

P0224

Throttle/Pedal Position Sensor/Switch B Circuit Intermittent

P0225

Throttle/Pedal Position Sensor/Switch C Circuit

P0226

Throttle/Pedal Position Sensor/Switch C Circuit Range/Performance Problem

P0227

Throttle/Pedal Position Sensor/Switch C Circuit Low Input

P0228

Throttle/Pedal Position Sensor/Switch C Circuit High Input

P0229

Throttle/Pedal Position Sensor/Switch C Circuit Intermittent

P0230

Fuel Pump Primary Circuit

P0231

Fuel Pump Secondary Circuit Low

P0232

Fuel Pump Secondary Circuit High

P0233

Fuel Pump Secondary Circuit Intermittent

P0234

Turbo/Super Charger Overboost Condition

Manifold pressure reading above turbocharger over-boost limit detected during engine operation

P0235

Turbo/Super Charger Boost Sensor A Circuit

P0236 (M)

Turbo/Super Charger Boost Sensor A Circuit Range/Performance

P0237 (M)

Turbo/Super Charger Boost Sensor A Circuit Low

P0238 (M)

Turbo/Super Charger Boost Sensor A Circuit High

P0239

Turbo/Super Charger Boost Sensor B Circuit

P0240

Turbo/Super Charger Boost Sensor B Circuit Range/Performance

P0241

Turbo/Super Charger Boost Sensor B Circuit Low

P0242

Turbo/Super Charger Boost Sensor B Circuit High

P0243

Turbo/Super Charger Wastegate Solenoid A

Open or shorted condition detected in the turbocharger wastegate solenoid control circuit.

P0244

Turbo/Super Charger Wastegate Solenoid A Range/Performance

P0245

Turbo/Super Charger Wastegate Solenoid A Low

P0246

Turbo/Super Charger Wastegate Solenoid A High

P0247

Turbo/Super Charger Wastegate Solenoid B

P0248

Turbo/Super Charger Wastegate Solenoid B Range/Performance

P0249

Turbo/Super Charger Wastegate Solenoid B Low

P0250

Turbo/Super Charger Wastegate Solenoid B High

P0251 (M)

Injection Pump Fuel Metering Control A (Cam/Rotor/Injector)

P0252 (M)

Injection Pump Fuel Metering Control A Range/Performance (Cam/Rotor/Injector)

P0253 (M)

Injection Pump Fuel Metering Control A Low (Cam/Rotor/Injector)

P0254

Injection Pump Fuel Metering Control A High (Cam/Rotor/Injector)

P0255

Injection Pump Fuel Metering Control A Intermittent (Cam/Rotor/Injector)

P0256

Injection Pump Fuel Metering Control B (Cam/Rotor/Injector)

P0257

Injection Pump Fuel Metering Control B Range/Performance (Cam/Rotor/Injector)

P0258

Injection Pump Fuel Metering Control B Low (Cam/Rotor/Injector)

P0259

Injection Pump Fuel Metering Control B High (Cam/Rotor/Injector)

P0260

Injection Pump Fuel Metering Control B Intermittent (Cam/Rotor/Injector)

P0261

Cylinder 1 Injector Circuit Low

P0262

Cylinder 1 Injector Circuit High

P0263

Cylinder 1 Contribution/Balance

P0264

Cylinder 2 Injector Circuit Low

P0265

Cylinder 2 Injector Circuit High

P0266

Cylinder 2 Contribution/Balance

P0267

Cylinder 3 Injector Circuit Low

P0268

Cylinder 3 Injector Circuit High

P0269

Cylinder 3 Contribution/Balance

P0270

Cylinder 4 Injector Circuit Low

P0271

Cylinder 4 Injector Circuit High

P0272

Cylinder 4 Contribution/Balance

P0273

Cylinder 5 Injector Circuit Low

P0274

Cylinder 5 Injector Circuit High

P0275

Cylinder 5 Contribution/Balance

P0276

Cylinder 6 Injector Circuit Low

P0277

Cylinder 6 Injector Circuit High

P0278

Cylinder 6 Contribution/Balance

P0279

Cylinder 7 Injector Circuit Low

P0280

Cylinder 7 Injector Circuit High

P0281

Cylinder 7 Contribution/Balance

P0282

Cylinder 8 Injector Circuit Low

P0283

Cylinder 8 Injector Circuit High

P0284

Cylinder 8 Contribution/Balance

P0285

Cylinder 9 Injector Circuit Low

P0286

Cylinder 9 Injector Circuit High

P0287

Cylinder 9 Contribution/Balance

P0288

Cylinder 10 Injector Circuit Low

P0289

Cylinder 10 Injector Circuit High

P0290

Cylinder 10 Contribution/Balance

P0291

Cylinder 11 Injector Circuit Low

P0292

Cylinder 11 Injector Circuit High

P0293

Cylinder 11 Contribution/Balance

P0294

Cylinder 12 Injector Circuit Low

P0295

Cylinder 12 Injector Circuit High

P0296

Cylinder 12 Contribution/Balance

P0298

Engine Oil Over Temperature

Scan Code

DRB Scan Tool Display

Description of Diagnostic Trouble Code

P0300 (M)

Random/Multiple Cylinder Misfire Detected

Misfire detected in multiple Cylinders.

P0301 (M)

Cylinder # 1 Misfire

Misfire detected in Cylinder # 1.

P0302 (M)

Cylinder # 2 Misfire

Misfire detected in Cylinder # 2.

P0303 (M)

Cylinder # 3 Misfire

Misfire detected in Cylinder # 3.

P0304 (M)

Cylinder # 4 Misfire

Misfire detected in Cylinder # 4.

P0305 (M)

Cylinder # 5 Misfire

Misfire detected in Cylinder # 5.

P0306 (M)

Cylinder # 6 Misfire

Misfire detected in Cylinder # 6.

P0307 (M)

Cylinder # 7 Misfire

Misfire detected in Cylinder # 7

P0308 (M)

Cylinder # 8 Misfire

Misfire detected in Cylinder # 8.

P0309 (M)

Cylinder # 9 Misfire

Misfire detected in Cylinder # 9.

P0310 (M)

Cylinder # 10 Misfire

Misfire detected in Cylinder # 10.

P0311 (M)

Cylinder # 10 Misfire

Misfire detected in Cylinder # 11.

P0311 (M)

Cylinder # 12 Misfire

Misfire detected in Cylinder # 12.

P0313 (M)

Misfire Detected with Low Fuel

P0314 (M)

Single Cylinder Misfire (Cylinder not Specified)

P0315

No Crank Sensor Learned

Unable to learn the crank sensor signal in preparation for Misfire diagnostics.

P0320

No Crank Reference Signal at PCM

No reference signal (crankshaft position sensor) detected during engine cranking.

P0320 (M)

No RPM Signal to PCM (Crankshaft Position Sensor Signal to JTEC)

A CKP signal has not been detected at the PCM.

P0321

Ignition/Distributor Engine Speed Input Circuit Range/Performance

P0322

Ignition/Distributor Engine Speed Input Circuit No Signal

P0323

Ignition/Distributor Engine Speed Input Circuit Intermittent

P0324

Knock Control System Error

P0325

Knock Sensor 1 Circuit (Bank 1 or Single Sensor)

Knock sensor (# 1) signal above or below minimum acceptable threshold voltage at particular engine speeds.

P0326

Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)

P0327

Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

P0328

Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)

P0329

Knock Sensor 1 Circuit Input Intermittent (Bank 1 or Single Sensor)

P0330

Knock Sensor 2 Circuit (Bank 2)

Circuit Knock sensor (# 2) signal above or below minimum acceptable threshold voltage at particular engine speeds.

P0335

Crankshaft Position Sensor Circuit

A rationality error has been detected for loss of crankshaft position sensor.

P0336 (M)

Crankshaft Position (CKP) Sensor Signal

Problem with voltage signal from CKP.

P0339

Crankshaft Position Sensor Circuit Intermittent

A rationality error has been detected for intermittent loss of crankshaft position sensor.

P0340 (M)

Camshaft Position Sensor A Circuit (Bank 1 or Single Sensor)

A rationality error has been detected for loss of camshaft position sensor (no fuel sync). WJ 1999 &' 2000: Check the camshaft target wheel (located on the right side camshaft sprocket) for damage or excessive runout. The runout is very critical for proper camshaft signal input to the JTEC. The lateral runout on the target wheel should not exceed 0.012 inch.

P0341 (M)

Camshaft Position Sensor A Circuit Range/Performance (Bank 1 or Single Sensor)

P0342 (M)

Camshaft Position Sensor A Circuit Low Input (Bank 1 or Single Sensor)

P0343 (M)

Camshaft Position Sensor A Circuit High Input (Bank 1 or Single Sensor)

P0344

Camshaft Position Sensor A Circuit Intermittent (Bank 1 or Single Sensor)

A rationality error has been detected for intermittent loss of camshaft position sensor.

P0345

Camshaft Position Sensor A Circuit (Bank 2)

P0346

Camshaft Position Sensor A Circuit Range/Performance (Bank 2)

P0347

Camshaft Position Sensor A Circuit Low Input (Bank 2)

P0348

Camshaft Position Sensor A Circuit High Input (Bank 2)

P0349

Camshaft Position Sensor A Circuit Intermittent (Bank 2)

P0350

Ignition Coil Primary/Secondary Circuit

A coil (1-5) is drawing too much current.

P0351 (M)

Ignition Coil A Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time.

P0352 (M)

Ignition Coil B Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time.

P0353 (M)

Ignition Coil C Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time.

P0354 (M)

Ignition Coil D Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time (High Impedance).

P0355 (M)

Ignition Coil E Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time (High Impedance).

P0356 (M)

Ignition Coil F Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time (high impedance).

P0357 (M)

Ignition Coil G Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time (high impedance).

P0358 (M)

Ignition Coil H Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time (high impedance).

P0359

Ignition Coil I Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time (high impedance).

P0360

Ignition Coil J Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time (high impedance).

P0361

Ignition Coil K Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time (high impedance).

P0362

Ignition Coil L Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time (high impedance).

P0365

Camshaft Position Sensor B Circuit (Bank 1)

P0366

Camshaft Position Sensor B Circuit Range/Performance (Bank 1)

P0367

Camshaft Position Sensor B Circuit Low Input (Bank 1)

P0368

Camshaft Position Sensor B Circuit High Input (Bank 1)

P0369

Camshaft Position Sensor B Circuit Intermittent (Bank 1)

P0370

Timing Reference High Resolution Signal A)

P0371

Timing Reference High Resolution Signal A Too Many Pulses

P0372

Timing Reference High Resolution Signal A Too Few Pulses

P0373

Timing Reference High Resolution Signal A Intermittent/Erratic Pulses

P0374

Timing Reference High Resolution Signal A No Pulse

P0375

Timing Reference High Resolution Signal B

P0376

Timing Reference High Resolution Signal B Too Many Pulses

P0377

Timing Reference High Resolution Signal B Too Few Pulses

P0378

Timing Reference High Resolution Signal B Intermittent/Erratic Pulses

P0379

Timing Reference High Resolution Signal B No Pulses

P0380 (M)

Glow Plug/Heater Circuit A

P0381 (M)

Glow Plug/Heater Indicator Circuit

P0382 (M)

Glow Plug/Heater Circuit B

P0385

Crankshaft Position Sensor B Circuit

P0386

Crankshaft Position Sensor B Circuit Range/Performance

P0387

Crankshaft Position Sensor B Circuit Low Input

P0388

Crankshaft Position Sensor B Circuit High Input

P0389

Crankshaft Position Sensor B Circuit Intermittent

P0390

Camshaft Position Sensor B Circuit (Bank 2)

P0391

Camshaft Position Sensor B Circuit Range/Performance (Bank 2)

P0392

Camshaft Position Sensor B Circuit Low Input (Bank 2)

P0393

Camshaft Position Sensor B Circuit High Input (Bank 2)

P0394

Camshaft Position Sensor B Circuit Intermittent (Bank 2)

Scan Code

DRB Scan Tool Display

Description of Diagnostic Trouble Code

P0400

Diesel EGR System Failure

Diesel EGR control module not active or a fault condition of the dedicated EGR sensors and/or EGR solenoid was detected by the EGR control

P0401 (M)

EGR System Failure

Required change in air/fuel ration not detected during diagnostic test.

P0402 (M)

Exhaust Gas Recirculation Flow Excessive Detected

P0403 (M)

EGR Solenoid Circuit

An open or shorted condition detected in the EGR solenoid control circuit.

P0404 (M)

Exhaust Gas Recirculation Control Circuit Range/Performance

EGR position sensor signal does not correlate to EGR duty cycle.

P0405 (M)

Exhaust Gas Recirculation Sensor A Circuit Low

EGR position sensor input below the acceptable voltage range.

P0406 (M)

Exhaust Gas Recirculation Sensor A Circuit High

EGR position sensor input above the acceptable voltage range.

P0407

Exhaust Gas Recirculation Sensor B Circuit Low

P0408

Exhaust Gas Recirculation Sensor B Circuit High

P0409

Exhaust Gas Recirculation Sensor A Circuit

P0410

Secondary Air Injection System

P0411

Secondary Air Injection System Incorrect Flow Detected

P0412

Secondary Air Injection System Switching Valve A Circuit

An open or shorted condition detected in the secondary air (air switching/aspirator) solenoid control circuit.

P0413

Secondary Air Injection System Switching Valve A Circuit Open

P0414

Secondary Air Injection System Switching Valve A Circuit Shorted

P0415

Secondary Air Injection System Switching Valve B Circuit

P0416

Secondary Air Injection System Switching Valve B Circuit Open

P0417

Secondary Air Injection System Switching Valve B Circuit Shorted

P0418

Secondary Air Injection System Relay A Circuit

P0419

Secondary Air Injection System Relay B Circuit

P0420 (M)

Catalyst System Efficiency Below Threshold (Bank 1)

Catalyst 1/1 efficiency below required level.

P0421

Warm Up Catalyst Efficiency Below Threshold (Bank 1)

P0422

Main Catalyst Efficiency Below Threshold (Bank 1)

P0423

Heated Catalyst Efficiency Below Threshold (Bank 1)

P0424

Heated Catalyst Efficiency Below Threshold (Bank 1)

P0425

Catalyst Temperature Sensor (Bank 1)

P0426

Catalyst Temperature Sensor Range/Performance (Bank 1)

P0427

Catalyst Temperature Sensor Low Input (Bank 1)

P0428

Catalyst Temperature Sensor High Input (Bank 1)

P0429

Catalyst Heater Control Circuit (Bank 1)

P0430

Catalyst System Efficiency Below Threshold (Bank 2)

P0431

Warm Up Catalyst Efficiency Below Threshold (Bank 2)

P0432 (M)

Main Catalyst Efficiency Below Threshold (Bank 2)

Catalyst 2/1 efficiency below required level.

P0433

Heated Catalyst Efficiency Below Threshold (Bank 2)

P0434

Heated Catalyst Temperature Below Threshold (Bank 2)

P0435

Catalyst Temperature Sensor (Bank 2)

P0436

Catalyst Temperature Sensor Range/Performance (Bank 2)

P0436

Catalyst Temperature Sensor Low Input (Bank 2)

P0438

Catalyst Temperature Sensor High Input (Bank 2)

P0439

Catalyst Heater Control Circuit (Bank 2)

P0439

Evaporative Emission Control System

P0441 (M)

Evaporative Emission Control System Incorrect Purge Flow

Insufficient or excessive vapor flow detected during evaporative emission system operation. If after performing all powertrain test for P0441 with results that appear to be normal/test pass, check for fuel in the purge canister. If there is fuel in the purge canister check ORVR (on-board refueling vapor recovery) system per service manual section 25. If ORVO is working as designed insure that the vehicle owner is not overfilling the fuel tank.

P0442 (M)

Evaporative Emission Control System Leak Detected (medium leak)

A 0.040 leak has been detected in the evaporative system. (A faulty gas cap may cause this code). Also see TSB 25-001-02A. Note: The respective Powertrain Diagnostic Procedures Manual will direct the technician to determine if the vehicle evaporative system has an external system leak. Examples of some external system leaks are: a loose gas cap, a disconnected evaporative system hose, or a loose hose connection. Remember that the evaporative system may also have an internal system leak. This internal leak may be caused by an intermittent or permanently stuck open Duty Cycle Purge (DCP) valve. This leak source is considered to be internal because any escaping emissions enter into the engine system and not directly into the atmosphere, unlike an external leak. An internal leak may cause one of the above DTC?s. Possible causes of a stuck open (intermittent or permanent) DCP valve are: 1. Corrosion due to system moisture or possible water intrusion into the system.

P0443 (M)

Evaporative Emission Control System Purge Control Valve Circuit

An open or shorted condition detected in the EVAP purge solenoid control circuit. Check the charcoal canister for fuel saturation If the vehicle has been overfueled, then there is a chance that liquid fuel can enter the canister and cause drive problems or emission related problems.

P0444

Evaporative Emission Control System Purge Control Valve Circuit Open

P0445

Evaporative Emission Control System Purge Control Valve Circuit Shorted

P0446

Evaporative Emission Control System Vent Control Circuit

P0447

Evaporative Emission Control System Vent Control Circuit Open

P0448

Evaporative Emission Control System Vent Control Circuit Shorted

P0449

Evaporative Emission Control System Vent Valve/Solenoid Circuit

P0450

Evaporative Emission Control System Pressure Sensor

P0451

Evaporative Emission Control System Pressure Sensor Range/Performance

P0452

Evaporative Emission Control System Pressure Sensor Low Input

NVLD pressure switch stuck closed.

P0453

Evaporative Emission Control System Pressure Sensor High Input

NVLD pressure switch stuck open.

P0454

Evaporative Emission Control System Pressure Sensor Intermittent

P0455 (M)

Evaporative Emission Control System Leak Detected (large leak)

A large leak has been detected in the evaporative system. See TSB 25-001-02. Also, possible faulty or loose gas cap. Note: The respective Powertrain Diagnostic Procedures Manual will direct the technician to determine if the vehicle evaporative system has an external system leak. Examples of some external system leaks are: a loose gas cap, a disconnected evaporative system hose, or a loose hose connection. Remember that the evaporative system may also have an internal system leak. This internal leak may be caused by an intermittent or permanently stuck open Duty Cycle Purge (DCP) valve. This leak source is considered to be internal because any escaping emissions enter into the engine system and not directly into the atmosphere, unlike an external leak. An internal leak may cause one of the above DTC?s. Possible causes of a stuck open (intermittent or permanent) DCP valve are: 1. Corrosion due to system moisture or possible water intrusion into the system.

P0456 (M)

Evaporative Emission Control System Leak Detected (very small leak)

A 0.020 leak has been detected in the evaporative system. See TSB's 25-001-02A, 18-002-03 and 25-004-01. Also, possible faulty or loose gas cap.

(Also see Notes in P0455 above). Does customer regularly commute on a steep grade (down hill grades in excess of 10%? Has the Leak Detection Pump Operation and Diagnosis booklet (Publication No. 81-170-000606) been used to assist in the diagnosis?

Review and if necessary, perform TSB 18-010-02. Be sure to completely read the TSB. The fix for the condition is a PCM replacement, not a reprogramming of the controller. Be sure that there is not any leaks in the system. This TSB applies in a very limited number of cases and usually in mountainous regions. TSB 18-010-02 Is a PCM replacement correct an erroneous MIL illumination for SAE P0456 that sets when driven on steep grades.

P0457

Evaporative Emission Control System Leak Detected (fuel cap loose/off)

A 0.020 leak has been detected in the evaporative system.

P0460

Fuel Level Unit No Change Over Miles

During low fuel.

P0460

Fuel Level Unit No Change Over Miles

Fuel level sending unit voltage does not change for more than 40 miles.

P0461

Fuel Level Sensor Circuit Range/Performance

No level of fuel level sender detected.

P0462 (M)

Fuel Level Sending Unit Volts Too Low

Fuel level sensor input below acceptable voltage.

P0462 (M)

Fuel Level Sending Unit Volts Too Low

Open circuit between PCM and fuel gauge sending unit.

P0463 (M)

Fuel Level Sending Unit Volts Too High

Fuel level sensor input above acceptable voltage.

P0463

Fuel Level Sending Unit Volts Too High

Circuit shorted to voltage between PCM and fuel gauge sending unit.

P0464

Fuel Level Sensor Circuit Intermittent

P0465

EVAP Purge Flow Sensor Circuit

P0466

EVAP Purge Flow Sensor Circuit Range/Performance

P0467

EVAP Purge Flow Sensor Circuit Low Input

P0468

EVAP Purge Flow Sensor Circuit High Input

P0469

EVAP Purge Flow Sensor Circuit Intermittent

P0470

Exhaust Pressure Sensor

P0471

Exhaust Pressure Sensor Range/Performance

P0472

Exhaust Pressure Sensor Low

P0473

Exhaust Pressure Sensor High

P0474

Exhaust Pressure Sensor Intermittent

P0475

Exhaust Pressure Control Valve

P0476

Exhaust Pressure Control Valve Range/Performance

P0477

Exhaust Pressure Control Valve Low

P0478

Exhaust Pressure Control Valve High

P0479

Exhaust Pressure Control Valve Intermittent

P0480

Cooling Fan 1 Control Circuit

An open or shorted condition detected in the low speed radiator fan relay control circuit.

P0481

Cooling Fan 2 Control Circuit

An open or shorted condition detected in the high speed radiator fan relay control circuit.

P0482

Cooling Fan 3 Control Circuit

P0483

Cooling Fan Rationality Check

P0484

Cooling Fan Circuit Over Current

P0485

Cooling Fan Power/Ground Circuit

P0486

Exhaust Gas Recirculation Sensor B Circuit

P0487

Exhaust Gas Recirculation Throttle Position Control Circuit

P0488

Exhaust Gas Recirculation Throttle Position Control Range/Performance

P0491

Secondary Air Injection System (Bank 1)

P0492

Secondary Air Injection System (Bank 2)

P0498

NVLD Canister Vent Valve Solenoid Circuit Low

A shorted low condition detected in NVLD solenoid circuit.

P0499

NVLD Canister Vent Valve Solenoid Circuit High

A shorted high condition detected in NVLD solenoid circuit.

Scan Code

DRB Scan Tool Display

Description of Diagnostic Trouble Code

P0500 (M)

No Vehicle Speed Sensor Signal

No vehicle speed sensor signal detected during road load conditions.

P0500 (M)

No Vehicle Speed Sensor Signal

A vehicle speed signal was not detected.

P0501

Vehicle Speed Sensor # 1 Performance

A rationality error has been detected for no vehicle speed sensor signal detected during road load conditions.

P0502

Vehicle Speed Sensor Circuit Low Input

P0503

Vehicle Speed Sensor Intermittent/Erratic/High

P0505 (M)

Idle Air Control Motor Circuits

Replace idle air control motor.

P0506

Idle Control System RPM Lower Than Expected

P0507

Idle Control System RPM Higher Than Expected

P0508 (M)

Idle Air Control Motor Circuit Low

Idle Air Control Motor Circuit input below acceptable current.

P0509 (M)

Idle Air Control Motor Circuit High

Idle Air Control Motor Circuit input above acceptable current.

P0510

Closed Throttle Position Switch

P0511

Idle Air Control Valve Solenoid Circuit

An open or shorted condition detected in the IAC control circuit.

P0512

Starter Request Circuit

P0513

Invalid SKIM Key

The engine controller has received an invalid key from the Smart Key Immobilizer Module.

P0515

Battery Temperature Sensor Circuit

P0516

Battery Temperature Sensor Low

Battery temperature sensor input is below minimum acceptable voltage.

P0517

Battery Temperature Sensor High

Battery temperature sensor input above maximum acceptable voltage.

P0519

Idle Speed Performance

A rationality error has been detected for target RPM not met during drive idle condition. Possible Vacuum leak or IAC lost steps.

P0520

Engine Oil Pressure Sensor/Switch Circuit

P0521

Engine Oil Pressure Sensor/Switch Range/Performance

P0522

Oil Pressure Sensor Low

Oil pressure sensor input below acceptable voltage.

P0523

Oil Pressure Sensor High

Oil pressure sensor input above acceptable voltage.

P0524

Engine Oil Pressure Too Low

P0530

A/C Refrigerant Pressure Sensor Circuit

P0531

A/C Refrigerant Pressure Sensor Circuit Range/Performance

P0532

A/C Refrigerant Pressure Sensor Circuit Low Input

A/C pressure sensor input below the minimum acceptable voltage.

P0533

A/C Refrigerant Pressure Sensor Circuit High Input

A/C pressure sensor input above the maximum acceptable voltage.

P0534

Air Conditioner Refrigerant Charge Loss

P0540

Intake Air Heater Circuit

P0541

Intake Air Heater Circuit Low

P0542

Intake Air Heater Circuit High

P0544

Exhaust Gas Temperature Sensor Circuit (Bank 1)

P0545

Exhaust Gas Temperature Sensor Circuit Low (Bank 1)

P0546

Exhaust Gas Temperature Sensor Circuit High (Bank 1)

P0547

Exhaust Gas Temperature Sensor Circuit (Bank 2)

P0548

Exhaust Gas Temperature Sensor Circuit Low (Bank 2)

P0549

Exhaust Gas Temperature Sensor Circuit High (Bank 2)

P0550

Power Steering Pressure Sensor Circuit

P0551 (M)

Power Steering Pressure Sensor Circuit Range/Performance

Incorrect input state detected for the power steering switch circuit (for PL, high pressure seen at high speed)

P0552

Power Steering Pressure Sensor Circuit Low Input

P0553

Power Steering Pressure Sensor Circuit High Input

P0554

Power Steering Pressure Sensor Circuit Intermittent

P0560

System Voltage

P0561

System Voltage Unstable

P0562

Battery Voltage Low

Battery voltage sensor input below the minimum acceptable voltage.

P0563

Battery Voltage High

Battery voltage sensor input above the maximum acceptable voltage.

P0564

Cruise Control Multi-Function Input Signal

P0565

Cruise Control On Signal

P0566

Cruise Control Off Signal

P0567

Cruise Control Resume Signal

P0568

Cruise Control Set Signal

P0569

Cruise Control Coast Signal

P0570

Cruise Control Accelerate Signal

P0571

Cruise Control/Brake Switch A Circuit

P0572

Cruise Control/Brake Switch A Circuit Low

P0573

Cruise Control/Brake Switch A Circuit High

P0574

Cruise Control System - Vehicle Speed Too High

P0575

Cruise Control Input Circuit

P0576

Cruise Control Input Circuit Low

P0577

Cruise Control Input Circuit High

P0578

Reserved for Cruise Control Codes

P0579

Speed Control Switch # 1 Performance

Cruise switch stuck in a valid voltage range.

P0580

Speed Control Switch # 1 Low

Speed control switch input below minimum acceptable voltage.

P0581

Speed Control Switch # 1 High

Speed control switch input above maximum acceptable voltage.

P0582

Speed Control Vacuum Solenoid Circuit

An open or shorted condition detected in speed control Vacuum solenoid control circuit.

P0586

Speed Control Vent Solenoid Circuit

An open or shorted condition detected in speed control vent solenoid control circuit.

P0594

Speed Control Servo Power Circuit

An open or shorted condition open/short condition detected in the speed control servo power control circuit.

Scan Code

DRB Scan Tool Display

Description of Diagnostic Trouble Code

P0600 (M)

PCM Failure SPI Communications

No communication detected between co-processors in the control module.

P0601 (M)

Internal Controller Failure

Internal control module fault condition (check sum) detected.

P0602 (M)

Control Module Programming Error

P0603

Internal Control Module Keep Alive Memory (KAM) Error

P0604

Internal Transmission Controller

Transmission control module RAM self-test fault detected. -Asian transmission.

P0605

Internal Transmission Controller

Transmission control module ROM self-test fault detected -Asian transmission.

P0606 (M)

ECM/PCM Processor

P0607

Control Module Performance

P0608

Control Module VSS Output A

P0609

Control Module VSS Output B

P0610

Control Module Vehicle Options Error

P0615

Starter Relay Circuit

Open or shorted condition detected in the starter relay control circuit.

P0616

Starter Relay Circuit Low

P0617

Starter Relay Circuit High

P0618

Alternative Fuel Control Module KAM Error

P0619

Alternative Fuel Control Module RAM/ROM Error

P0620

Generator Control Circuit

P0621

Generator Lamp L Terminal Control Circuit

P0622 (G)

Generator Field Not Switching Properly

An open or shorted condition detected in the generator field control circuit.

P0623

Generator Lamp Control Circuit

P0624

Fuel Cap Lamp Control Circuit

P0627

Fuel Pump Relay Circuit

An open or shorted condition detected in the fuel pump relay control circuit.

P0630

VIN Not Programmed

In PCM VIN is not programmed in the control module EEPROM.

P0631

VIN Not Programmed or Mismatch - TCM

P0632

Odometer Not Programmed

In PCM Odometer is not programmed in the control module EEPROM.

P0633

SKIM Key Not Programmed

In PCM SKIM secret key is not programmed in the control module EEPROM.

P0635

Power Steering Control Circuit

P0636

Power Steering Control Circuit Low

P0637

Power Steering Control Circuit High

P0638

Throttle Actuator Control Range/Performance (Bank 1)

P0639

Throttle Actuator Control Range/Performance (Bank 2)

P0640

Intake Air Heater Control Circuit

P0645

A/C Clutch Relay Circuit

An open or shorted condition detected in the A/C clutch relay control circuit.

P0646

A/C Clutch Relay Control Circuit Low

P0647

A/C Clutch Relay Control Circuit High

P0648

Immobiliser Lamp Control Circuit (Immobiliser pending SAE J1930 approval)

P0649

Speed Control Lamp Control Circuit

P0650

Malfunction Indicator Lamp (MIL) Control Circuit

P0654

Engine RPM Output Circuit

P0655

Engine Hot Lamp Output Control Circuit

P0656

Fuel Level Output Circuit

P0660

Intake Manifold Tuning Valve Control Circuit (Bank 1)

An open or shorted condition detected in the manifold tuning valve solenoid control circuit.

P0661

Intake Manifold Tuning Valve Control Circuit Low (Bank 1)

P0662

Intake Manifold Tuning Valve Control Circuit High (Bank 1)

P0663

Intake Manifold Tuning Valve Control Circuit (Bank 2)

P0664

Intake Manifold Tuning Valve Control Circuit Low (Bank 2)

P0665

Intake Manifold Tuning Valve Control Circuit High (Bank 2)

P0685

ASD Relay Control Circuit

An open or shorted condition detected in the ASD relay control circuit.

P0688

ASD Relay Sensor Circuit Low

ASD voltage sensed when ASD relay is energized or ASD voltage not sensed when ASD relay is not energized.

Scan Code

DRB Scan Tool Display

Description of Diagnostic Trouble Code

P0700 (M)

Check Transmission DTC's

This code indicates that the EATX (Transmission controller) has an active fault and has illuminated the MIL via a BUS message. The specific fault must be acquired from the EATX via a DRBIII tool. (Input or Output Speed Sensor failures often cause this code and are a common failure part on WJ Grand Cherokees).

P0701

Transmission Control System Range/Performance

P0702

Transmission Control System Electrical

P0703 (M)

Brake Switch Stuck Pressed or Released

Incorrect input state detected in the brake switch circuit. (Changed from P1595).

P0704

Clutch Switch Input Circuit Malfunction

P0705

Transmission Range Sensor Circuit Malfunction (PRNDL Input)

P0706

Transmission Range Sensor Circuit Range/Performance

P0707

Transmission Range Sensor Circuit Low Input

P0708

Transmission Range Sensor Circuit High Input

P0709

Transmission Range Sensor Circuit Intermittent

P0710

Transmission Fluid Temperature Sensor Circuit

P0711 (M)

Transmission Temperature Sensor No Temperature Rise After Start

Relationship between the transmission temperature and overdrive operation and or TCC operation indicates a failure of the Transmission Temperature Sensor - OBDII Rationality.

P0712 (M)

Transmission Temperature Sensor Voltage Too Low

Transmission fluid temperature sensor input below acceptable voltage.

P0713

Transmission Temperature Sensor Voltage Too High

Transmission fluid temperature sensor input above acceptable voltage. Was MIL code 37.

P0713 (M)

Transmission Temperature Sensor Voltage Too High

Voltage greater than 3.76 volts (4-speed auto. trans. only).

P0714

Transmission Fluid Temperature Sensor Circuit Intermittent

P0715

Input/Turbine Speed Sensor Circuit

P0716

Input/Turbine Speed Sensor Circuit Range/Performance

P0717

Input/Turbine Speed Sensor Circuit No Signal

P0718

Input/Turbine Speed Sensor Circuit Intermittent

P0719

Torque Converter/Brake Switch B Circuit Low

P0720 (M)

Low Output SPD Sensor RPM Above 15 MPH

The relationship between the Output Shaft Speed Sensor and vehicle speed is not within acceptable limits.

P0720 (M)

Low Output SPD Sensor RPM Above 15 MPH

Output shaft speed is less than 60 rpm with vehicle speed above 15 mph (4-speed auto. trans. only).

P0721

Output Speed Sensor Circuit Range/Performance

P0722

Output Speed Sensor Circuit No Signal

P0723

Output Speed Sensor Circuit Intermittent

P0724

Torque Converter/Brake Switch B Circuit High

P0725

Engine Speed Input Circuit

P0726

Engine Speed Input Circuit Range/Performance

P0727

Engine Speed Input Circuit No Signal

P0728

Engine Speed Input Circuit Intermittent

P0730

Incorrect Gear Ratio

P0731

Gear 1 Incorrect Ratio

P0732

Gear 2 Incorrect Ratio

P0733

Gear 3 Incorrect Ratio

P0734

Gear 4 Incorrect Ratio

P0735

Gear 5 Incorrect Ratio

P0736

Reverse Incorrect Ratio

P0737

TCM Engine Speed Output Circuit

P0738

TCM Engine Speed Output Circuit Low

P0739

TCM Engine Speed Output Circuit High

P0740 (M)

Torque Con Clu No RPM Drop at Lockup

Relationship between engine and vehicle speeds indicated failure of torque convertor clutch lock-up system (TCC/PTU sol).

P0743 (M)

Torque Converter Clutch Solenoid/Transmission Relay Circuits

An open or shorted condition detected in the torque converter clutch (part throttle unlock) solenoid control circuit. Shift solenoid C electrical fault - Aisin transmission.

P0743 (M)

Torque Converter Clutch Solenoid/Transmission Relay Circuits

An open or shorted condition detected in the torque converter part throttle unlock solenoid control circuit (3 or 4-speed auto. trans. only).

P0744

Torque Converter Clutch Circuit Intermittent

P0745

Pressure Control Solenoid A

P0746

Pressure Control Solenoid A Performance or Stuck Off

P0747

Pressure Control Solenoid A Stuck On

P0748 (M)

Governor Pressure Solenoid Control/Transmission Relay Circuits

An open or shorted condition detected in the Governor Pressure Solenoid circuit or Transmission Relay Circuit in JTEC RE transmissions.

P0748 (M)

Governor Pressure Solenoid Control/Transmission Relay Circuits

An open or shorted condition detected in the governor pressure solenoid or relay circuits (4-speed auto. trans. only).

P0749

Pressure Control Solenoid A Intermittent

P0750

Shift Solenoid circuit.

Note: If code P1767 (Transmission Relay Always On) is also present: Replace transmission solenoid assembly. See note provided. When transmission is in limp mode the relay that provides power to the solenoid group is switched off. This is normal and is designed to provide operation in one gear only.

Engineering department suggests to replace transmission solenoid assembly anytime these two trouble codes occur together. See applicable service manual section (21) for solenoid assembly replacement directions. IMPORTANT: When performing this repair always check torque on all valvebody accumulator cover plate screws. Proper torque specification is 70 inch pounds. If any accumulator cover plate screws are damaged or missing replace the valvebody assembly. NOTE: If any other trouble codes are present do not replace solenoid assembly. See test in the applicable Transmission Diagnostic Procedures Manual.

P0751 (M)

O/D Switch Pressed (Lo) More Than 5 Minutes

Overdrive Off switch input too low for more than 5 minutes (4-speed auto. trans. only).

P0752

Shift Solenoid A Stuck On

P0753 (M)

Transmission 3-4 Shift Sol/Transmission Relay Circuits

An open or shorted condition detected in the overdrive solenoid control circuit or Transmission Relay Circuit in JTEC RE transmissions.

P0753 (M)

Transmission 3-4 Shift Sol/Transmission Relay Circuits

An open or shorted condition detected in the transmission 2-4 shift solenoid circuit (4-speed auto. trans. only).

P0754

Shift Solenoid A Intermittents

P0755

Shift Solenoid B

P0756

AW4 Shift Sol B (2-3) Functional Failure

Shift solenoid B (2-3) functional fault - Asian transmission.

P0757

Shift Solenoid B Stuck On

P0758

Shift Solenoid B Electrical

P0759

Shift Solenoid B Intermittent

P0760

Shift Solenoid C

P0761

Shift Solenoid C Performance or Stuck Off

P0762

Shift Solenoid C Stuck On

P0763

Shift Solenoid C Electrical

P0764

Shift Solenoid C Intermittent

P0765

Shift Solenoid D

P0766

Shift Solenoid D Performance or Stuck Off

P0767

Shift Solenoid D Stuck On

P0768

Shift Solenoid D Electrical

P0769

Shift Solenoid D Intermittent

P0770

Shift Solenoid E

P0771

Shift Solenoid E Performance or Stuck Off

P0772

Shift Solenoid E Stuck On

P0773

Shift Solenoid E Electrical

P0774

Shift Solenoid E Intermittent

P0775

Pressure Control Solenoid B

P0776

Pressure Control Solenoid B Performance or Stuck off

P0777

Pressure Control Solenoid B Stuck On

P0778

Pressure Control Solenoid B Electrical

P0779

Pressure Control Solenoid B Intermittent

P0780

Shift

P0781

1-2 Shift

P0782

2-3 Shift

P0783

3-4 Shift Sol

No RPM Drop at Lockup

P0784

4-5 Shift

P0785

Shift/Timing Solenoid

P0786

Shift/Timing Solenoid Range/Performance

P0787

Shift/Timing Solenoid Low

P0788

Shift/Timing Solenoid High

P0789

Shift/Timing Solenoid Intermittent

P0790

Normal/Performance Switch Circuit

P0791

Intermediate Shaft Speed Sensor Circuit

P0792

Intermediate Shaft Speed Sensor Circuit Range/Performance

P0793

Intermediate Shaft Speed Sensor Circuit No Signal

P0794

Intermediate Shaft Speed Sensor Circuit Intermittent