Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2002 Jeep Grand Cherokee OverlandFACTORY OEM SERVICE PROCEDURE

Diagnostic Trouble Code Definitions

DIAGNOSTIC TROUBLE CODE MESSAGES & CODES

Generic Scan Tool Code ⁽¹⁾

DRBIII® Scan Tool Message

1/1 O2 SENSOR HEATER CIRCUIT LOW

1/1 O2 SENSOR HEATER CIRCUIT HIGH

1/2 O2 SENSOR HEATER CIRCUIT LOW

1/2 O2 SENSOR HEATER CIRCUIT HIGH

2/1 O2 SENSOR HEATER CIRCUIT LOW

2/1 O2 SENSOR HEATER CIRCUIT HIGH

BATTERY TEMP SENSOR PERFORMANCE

MAP SENSOR VOLTAGE TOO LOW

MAP SENSOR VOLTAGE TOO HIGH

INTAKE AIR TEMP SENSOR PERFORMANCE

INTAKE AIR TEMP SENSOR VOLTAGE LOW

INTAKE AIR TEMP SENSOR VOLTAGE HIGH

ECT SENSOR VOLTAGE TOO LOW

ECT SENSOR VOLTAGE TOO HIGH

P0120 ⁽²⁾

THROTTLE POSITION SENSOR SIGNAL CIRCUIT

TPS VOLTAGE DOES NOT AGREE WITH MAP

THROTTLE POSITION SENSOR VOLTAGE LOW

THROTTLE POSITION SENSOR VOLTAGE HIGH

CLOSED LOOP TEMP NOT REACHED

1/1 O2 SENSOR SHORTED TO GROUND

1/1 O2 SENSOR SHORTED TO VOLTAGE

1/1 O2 SENSOR SLOW RESPONSE

1/1 O2 SENSOR HEATER FAILURE

1/2 O2 SENSOR HEATER CIRCUIT MALFUNCTION

1/2 O2 SENSOR SHORTED TO GROUND

1/2 O2 SENSOR SHORTED TO VOLTAGE

1/2 O2 SENSOR SLOW RESPONSE

1/2 O2 SENSOR HEATER FAILURE

2/1 O2 SENSOR SHORTED TO GROUND

2/1 O2 SENSOR SHORTED TO VOLTAGE

2/1 O2 SENSOR SLOW RESPONSE

2/1 O2 SENSOR HEATER FAILURE

2/2 O2 SENSOR SHORTED TO GROUND

2/2 O2 SENSOR SHORTED TO VOLTAGE

2/2 O2 SENSOR SLOW RESPONSE

2/2 O2 SENSOR HEATER FAILURE

1/1 FUEL SYSTEM LEAN

1/1 FUEL SYSTEM RICH

2/1 FUEL SYSTEM LEAN

2/1 FUEL SYSTEM RICH

INJECTOR #1 CONTROL CIRCUIT

INJECTOR #2 CONTROL CIRCUIT

INJECTOR #3 CONTROL CIRCUIT

INJECTOR #4 CONTROL CIRCUIT

INJECTOR #5 CONTROL CIRCUIT

INJECTOR #6 CONTROL CIRCUIT

INJECTOR #7 CONTROL CIRCUIT (4.7L)

INJECTOR #8 CONTROL CIRCUIT (4.7L)

P0218 ⁽²⁾

HIGH TEMPERATURE OPERATION ACTIVATED

MULTIPLE CYLINDER MISFIRE

CYLINDER #1 MISFIRE

CYLINDER #2 MISFIRE

CYLINDER #3 MISFIRE

CYLINDER #4 MISFIRE

CYLINDER #5 MISFIRE

CYLINDER #6 MISFIRE

CYLINDER #7 MISFIRE (4.7L)

CYLINDER #8 MISFIRE (4.7L)

NO CRANK REFERENCE SIGNAL AT PCM

KNOCK SENSOR #1 CIRCUIT

KNOCK SENSOR #2 CIRCUIT

NO CAM SIGNAL AT PCM

IGNITION COIL #1 PRIMARY CIRCUIT (4.0L)

IGNITION COIL #2 PRIMARY CIRCUIT (4.0L)

IGNITION COIL #3 PRIMARY CIRCUIT (4.0L)

IGNITION COIL #1 PRIMARY CIRCUIT (4.7L)

IGNITION COIL #2 PRIMARY CIRCUIT (4.7L)

IGNITION COIL #3 PRIMARY CIRCUIT (4.7L)

IGNITION COIL #4 PRIMARY CIRCUIT (4.7L)

IGNITION COIL #5 PRIMARY CIRCUIT (4.7L)

IGNITION COIL #6 PRIMARY CIRCUIT (4.7L)

IGNITION COIL #7 PRIMARY CIRCUIT (4.7L)

IGNITION COIL #8 PRIMARY CIRCUIT (4.7L)

1/1 CATALYTIC CONVERTER EFFICIENCY

2/1 CATALYTIC CONVERTER EFFICIENCY

EVAP PURGE FLOW MONITOR FAILURE

EVAP LEAK MONITOR MEDIUM (.040") LEAK DETECTED

EVAP PURGE SOLENOID CIRCUIT

EVAP LEAK MONITOR LARGE LEAK DETECTED

EVAP LEAK MONITOR SMALL (.020") LEAK DETECTED

FUEL LEVEL UNIT NO CHANGE OVER MILES

FUEL LEVEL UNIT NO CHANGE OVER TIME

FUEL LEVEL SENDING UNIT VOLTS TOO LOW

FUEL LEVEL SENSOR VOLTS TOO HIGH

NO VEHICLE SPEED SENSOR SIGNAL

IDLE AIR CONTROL MOTOR CIRCUITS

OIL PRESSURE SENSOR VOLTS LOW

OIL PRESSURE SENSOR VOLTS HIGH

PCM INTERNAL CONTROLLER FAILURE

P0604 ⁽²⁾

INTERNAL TCM

P0605 ⁽²⁾

INTERNAL TCM

P0613 ⁽²⁾

INTERNAL TCM

P0622 ⁽³⁾

GENERATOR FIELD NOT SWITCHING PROPERLY

TCM CONTROLLER DTC PRESENT

P0706 ⁽²⁾

CHECK SHIFTER SIGNAL

P0711 ⁽⁴⁾

TRANS TEMP SENSOR, NO TEMP RISE AFTER START

P0712 ⁽⁴⁾

TRANS TEMP SENSOR VOLTAGE TOO LOW

P0713 ⁽⁴⁾

TRANS TEMP SENSOR VOLTAGE TOO HIGH

P0715 ⁽²⁾

INPUT SPEED SENSOR ERROR

P0720 ⁽²⁾

OUTPUT SPEED SENSOR ERROR

P0720 ⁽⁴⁾

LOW OUTPUT SPEED SENSOR - RPM ABOVE 15 MPH

P0725 ⁽²⁾

ENGINE SPEED SENSOR CIRCUIT

P0731 ⁽²⁾

GEAR RATIO ERROR IN 1ST

P0732 ⁽²⁾

GEAR RATIO ERROR IN 2ND

P0733 ⁽²⁾

GEAR RATIO ERROR IN 3RD

P0734 ⁽²⁾

GEAR RATIO ERROR IN 4TH

P0735 ⁽²⁾

GEAR RATIO ERROR 4TH PRIME

P0736 ⁽²⁾

GEAR RATIO ERROR IN REVERSE

P0740 ⁽²⁾

TORQUE CONVERTER CLUTCH CONTROL CIRCUIT

P0740 ⁽⁴⁾

TORQ CONV CLU, NO RPM DROP AT LOCKUP

P0743 ⁽⁴⁾

TORQUE CONVERTER CLUTCH SOLENOID/TRANS RELAY CIRCUITS

P0748 ⁽⁴⁾

PRESSURE SOL CONTROL/TRANS RELAY CIRCUITS

P0750 ⁽²⁾

LR SOLENOID CIRCUIT

P0751 ⁽⁴⁾

O/D SWITCH PRESSED (LO) MORE THAN 5 MINUTES

P0753 ⁽⁴⁾

TRANS 3-4 SHIFT SOL/TRANS RELAY CIRCUITS

P0755 ⁽²⁾

2C SOLENOID CIRCUIT

P0760 ⁽²⁾

OD SOLENOID CIRCUIT

P0765 ⁽²⁾

UD SOLENOID CIRCUIT

P0770 ⁽²⁾

4C SOLENOID CIRCUIT

P0783 ⁽⁴⁾

3-4 SHIFT SOL, NO RPM DROP AT LOCKUP

P0841 ⁽²⁾

LR PRESSURE SWITCH SENSE CIRCUIT

P0845 ⁽²⁾

2C HYDRAULIC PRESSURE TEST FAILURE

P0846 ⁽²⁾

2C PRESSURE SWITCH SENSE CIRCUIT

P0867 ⁽²⁾

LINE PRESSURE FAULT

P0868 ⁽²⁾

LINE PRESSURE LOW

P0869 ⁽²⁾

LINE PRESSURE HIGH

P0870 ⁽²⁾

OD HYDRAULIC PRESSURE TEST FAILURE

P0871 ⁽²⁾

OD PRESSURE SWITCH SENSE CIRCUIT

P0875 ⁽²⁾

UD HYDRAULIC PRESSURE TEST FAILURE

P0876 ⁽²⁾

UD PRESSURE SWITCH SENSE CIRCUIT

P0884 ⁽²⁾

POWER UP AT SPEED

P0888 ⁽²⁾

RELAY OUTPUT ALWAYS OFF

P0890 ⁽²⁾

SWITCHED BATTERY

P0891 ⁽²⁾

TRANSMISSION RELAY ALWAYS ON

P0932 ⁽²⁾

LINE PRESSURE SENSOR FAULT

P0944 ⁽²⁾

LOSS OF PRIME

P0987 ⁽²⁾

4C HYDRAULIC PRESSURE TEST FAILURE

P0988 ⁽²⁾

4C PRESSURE SWITCH SENSE CIRCUIT

1/1 O2 SENSOR SLOW DURING CATALYST MONITOR

2/1 O2 SENSOR SLOW DURING CATALYST MONITOR

ENGINE IS COLD TOO LONG

FUEL PUMP/SYSTEM RELAY CONTROL CIRCUIT

TARGET IDLE NOT REACHED

NO 5 VOLTS TO MAP SENSOR

NO CHANGE IN MAP FROM START TO RUN

VACUUM LEAK FOUND

AUTO SHUTDOWN RELAY CONTROL CIRCUIT

NO ASD RELAY OUTPUT VOLTAGE AT PCM

INTERMITTENT LOSS OF CMP OR CKP

MISFIRE ADAPTIVE NUMERATOR AT LIMIT

EVAP LEAK MONITOR PINCHED HOSE FOUND

RAD FAN CONTROL RELAY CIRCUIT (4.0L)

P1492 ⁽³⁾

AMBIENT/BATT TEMP SEN VOLTAGE TOO HIGH

P1493 ⁽³⁾

AMBIENT/BATT TEMP SEN VOLTAGE TOO LOW

LEAK DETECTION PUMP SW OR MECHANICAL FAULT

LEAK DETECTION PUMP SOLENOID CIRCUIT

HYDRAULIC FAN SOLENOID CIRCUIT (4.7L)

P1594 ⁽³⁾

CHARGING SYSTEM VOLTAGE TOO HIGH

P1595 ⁽⁵⁾

SPEED CONTROL SOLENOID CIRCUITS

P1596 ⁽⁵⁾

SPEED CONTROL SWITCH ALWAYS HIGH

P1597 ⁽⁵⁾

SPEED CONTROL SWITCH ALWAYS LOW

A/C PRESSURE SENSOR VOLTS TOO HIGH

A/C PRESSURE SENSOR VOLTS TOO LOW

P1682 ⁽³⁾

CHARGING SYSTEM VOLTAGE TOO LOW

P1683 ⁽⁵⁾

SPD CTRL PWR RELAY; OR S/C 12V DRIVER CKT

P1684 ⁽²⁾

BATTERY WAS DISCONNECTED

WRONG OR INVALID KEY MSG RECEIVED FROM SKIM

NO SKIM BUS MESSAGE RECEIVED

P1694 ⁽²⁾

BUS COMMUNICATION WITH ENGINE MODULE

PCM FAILURE EEPROM WRITE DENIED

NO BUS MESSAGE FROM TCM

TRS PERFORMANCE

P1715 ⁽²⁾

RESTRICTED PORT IN T3 RANGE

P1736 ⁽²⁾

GEAR RATIO ERROR IN 2ND PRIME

P1756 ⁽⁴⁾

GOV PRESS NOT EQUAL TO TARGET @ 15-20 PSI

P1757 ⁽⁴⁾

GOV PRESS ABOVE 3 PSI IN GEAR WITH 0 MPH

P1762 ⁽⁴⁾

GOV PRESS SEN OFFSET VOLTS TOO LO OR HIGH

P1763 ⁽⁴⁾

GOVERNOR PRESSURE SENSOR VOLTS TOO HIGH

P1764 ⁽⁴⁾

GOVERNOR PRESSURE SENSOR VOLTS TOO LOW

P1765 ⁽⁴⁾

TRANS 12 VOLT SUPPLY RELAY CTRL CIRCUIT

P1775 ⁽²⁾

SOLENOID SWITCH VALVE LATCHED IN TCC POSITION

P1776 ⁽²⁾

SOLENOID SWITCH VALVE LATCHED IN LR POSITION

P1790 ⁽²⁾

FAULT IMMEDIATELY AFTER SHIFT

P1793 ⁽²⁾

TRD LINK COMMUNICATION ERROR

P1794 ⁽²⁾

SPEED SENSOR GROUND ERROR

P1799 ⁽²⁾

CALCULATED OIL TEMP IN USE

P2700 ⁽²⁾

INADEQUATE ELEMENT VOLUME LR

P2701 ⁽²⁾

INADEQUATE ELEMENT VOLUME 2C

P2702 ⁽²⁾

INADEQUATE ELEMENT VOLUME OD

P2703 ⁽²⁾

INADEQUATE ELEMENT VOLUME UD

P2704 ⁽²⁾

INADEQUATE ELEMENT VOLUME 4C

P2706 ⁽²⁾

MS SOLENOID CIRCUIT

⁽¹⁾	Perform appropriate DTC test under DIAGNOSTIC TESTS.

⁽²⁾	This DTC is related to the 545RFE automatic transmission, which is used on the 4.7L. For diagnostic procedure, see appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.

⁽³⁾	This DTC is related to charging system. For diagnostic procedure, see appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS.

⁽⁴⁾	This DTC is related to the 42RE automatic transmission, which is used on the 4.0L. For diagnostic procedure, see appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.

⁽⁵⁾	This DTC is related to cruise control system diagnostics. For diagnostic procedure, see appropriate CRUISE CONTROL SYSTEMS article in ACCESSORIES & EQUIPMENT.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.

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