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.
2021 Jeep Grand Cherokee L Laredo, AWDFACTORY OEM SERVICE PROCEDURE
Module, Transmission Control (TCM), 8HP50/850RE
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| P0219-00 | ENGINE OVERSPEED |
| P0562-00 | SYSTEM VOLTAGE LOW |
| P0563-00 | SYSTEM VOLTAGE HIGH |
| P0601-00 | INTERNAL CONTROL MODULE MEMORY CHECKSUM ERROR |
| P0607-00 | ECU INTERNAL PERFORMANCE |
| P0613-00 | INTERNAL TRANSMISSION PROCESSOR |
| P061B-00 | INTERNAL CONTROL MODULE TORQUE CALCULATION PERFORMANCE |
| P062F-00 | INTERNAL CONTROL MODULE EEPROM ERROR |
| P0634-00 | CONTROL MODULE INTERNAL TEMPERATURE 1 TOO HIGH |
| P0642-00 | SENSOR REFERENCE VOLTAGE 1 CIRCUIT LOW |
| P0643-00 | SENSOR REFERENCE VOLTAGE 1 CIRCUIT HIGH |
| P064F-00 | UNAUTHORIZED SOFTWARE/CALIBRATION DETECTED |
| P0667-00 | CONTROL MODULE INTERNAL TEMPERATURE SENSOR 1 RANGE/PERFORMANCE |
| P0668-00 | CONTROL MODULE INTERNAL TEMPERATURE SENSOR 1 CIRCUIT LOW |
| P0669-00 | CONTROL MODULE INTERNAL TEMPERATURE SENSOR 1 CIRCUIT HIGH |
| P06AB-00 | CONTROL MODULE INTERNAL TEMPERATURE SENSOR "2" CIRCUIT |
| P06AC-00 | CONTROL MODULE INTERNAL TEMPERATURE SENSOR 2 PERFORMANCE |
| P06AD-00 | CONTROL MODULE INTERNAL TEMPERATURE SENSOR 2 CIRCUIT LOW |
| P06AE-00 | CONTROL MODULE INTERNAL TEMPERATURE SENSOR 2 CIRCUIT HIGH |
| P0701-00 | TRANSMISSION CONTROL SYSTEM RANGE/PERFORMANCE |
| P0703-00 | BRAKE SWITCH 2 PERFORMANCE |
| P0712-00 | TRANSMISSION FLUID TEMPERATURE SENSOR "A" CIRCUIT LOW |
| P0713-00 | TRANSMISSION FLUID TEMPERATURE SENSOR "A" CIRCUIT HIGH |
| P0714-00 | TRANSMISSION FLUID TEMPERATURE SENSOR "A" CIRCUIT INTERMITTENT |
| P0716-00 | INPUT SHAFT SPEED SENSOR 1 PERFORMANCE |
| P0721-00 | OUTPUT SHAFT SPEED SENSOR CIRCUIT PERFORMANCE |
| P0729-00 | GEAR 6 SHIFT INCORRECT RATIO |
| P0731-00 | GEAR 1 SHIFT INCORRECT RATIO |
| P0732-00 | GEAR 2 SHIFT INCORRECT RATIO |
| P0733-00 | GEAR 3 SHIFT INCORRECT RATIO |
| P0734-00 | GEAR 4 SHIFT INCORRECT RATIO |
| P0735-00 | GEAR 5 SHIFT INCORRECT RATIO |
| P0746-00 | PRESSURE CONTROL SOLENOID "A" PERFORMANCE |
| P0750-00 | SHIFT SOLENOID 1 CONTROL CIRCUIT / OPEN |
| P0755-00 | SHIFT SOLENOID 2 CONTROL CIRCUIT / OPEN |
| P075B-00 | SHIFT SOLENOID "G" PERFORMANCE/STUCK OFF |
| P076F-00 | GEAR 7 SHIFT INCORRECT RATIO |
| P0776-00 | PRESSURE CONTROL SOLENOID "B" PERFORMANCE/STUCK OFF |
| P077C-00 | OUTPUT SHAFT SPEED SENSOR CIRCUIT LOW |
| P077D-00 | OUTPUT SHAFT SPEED SENSOR CIRCUIT HIGH |
| P077E-00 | TRANSMISSION FLUID TEMPERATURE - MULTIPLE SENSOR CORRELATION |
| P07B3-00 | PARK SWITCH 1 CIRCUIT LOW |
| P07B4-00 | PARK SWITCH 1 CIRCUIT HIGH |
| P07B9-00 | PARK SWITCH 2 CIRCUIT LOW |
| P07BA-00 | PARK SWITCH 2 CIRCUIT HIGH |
| P07BF-00 | INPUT/TURBINE SHAFT SPEED SENSOR 1 CIRCUIT LOW |
| P07C0-00 | INPUT/TURBINE SHAFT SPEED SENSOR 1 CIRCUIT HIGH |
| P07D9-00 | GEAR 8 SHIFT INCORRECT RATIO |
| P07E4-00 | UNABLE TO ENGAGE PARK |
| P0815-00 | P0815-00 - UPSHIFT SWITCH CIRCUIT |
| P0816-00 | P0816-00 - DOWNSHIFT SWITCH CIRCUIT |
| P0850-00 | PARK/NEUTRAL SWITCH PERFORMANCE |
| P085F-00 | P085F-00 - UP AND DOWN SHIFT SWITCH CIRCUIT RANGE/PERFORMANCE |
| P093B-00 | HYDRAULIC ACCUMULATOR SOLENOID SHORT TO GROUND |
| P093C-00 | HYDRAULIC ACCUMULATOR SOLENOID SHORT TO BATTERY |
| P0962-00 | PRESSURE CONTROL SOLENOID 1 CONTROL CIRCUIT LOW |
| P0963-00 | PRESSURE CONTROL SOLENOID 1 CONTROL CIRCUIT HIGH |
| P0972-00 | SHIFT SOLENOID 1 CONTROL CIRCUIT PERFORMANCE |
| P0973-00 | SHIFT SOLENOID 1 CONTROL CIRCUIT LOW |
| P0974-00 | SHIFT SOLENOID 1 CONTROL CIRCUIT HIGH |
| P0975-00 | SHIFT SOLENOID B CONTROL CIRCUIT PERFORMANCE |
| P0976-00 | SHIFT SOLENOID 2 CONTROL CIRCUIT LOW |
| P0977-00 | SHIFT SOLENOID 2 CONTROL CIRCUIT HIGH |
| P0978-00 | SHIFT SOLENOID 3 CONTROL CIRCUIT RANGE/PERFORMANCE |
| P0979-00 | SHIFT SOLENOID 3 CONTROL CIRCUIT LOW |
| P0980-00 | SHIFT SOLENOID 3 CONTROL CIRCUIT HIGH |
| P0981-00 | SHIFT SOLENOID 4 CONTROL CIRCUIT RANGE/PERFORMANCE |
| P0982-00 | SHIFT SOLENOID 4 CONTROL CIRCUIT LOW |
| P0983-00 | SHIFT SOLENOID 4 CONTROL CIRCUIT HIGH |
| P0984-00 | SHIFT SOLENOID 5 CONTROL CIRCUIT RANGE/PERFORMANCE |
| P0985-00 | SHIFT SOLENOID 5 CONTROL CIRCUIT LOW |
| P0986-00 | SHIFT SOLENOID 5 CONTROL CIRCUIT HIGH |
| P1500-00 | ECU CONFIGURATION MISMATCH |
| P1614-00 | ECU RESET/RECOVERY OCCURRED |
| P1634-00 | TCM INTERNAL - INTERNAL WATCHDOG PERFORMANCE |
| P167A-00 | CALIBRATION MISMATCH |
| P16F1-00 | P16F1-00 INTERNAL SPI COMMUNICATION |
| P1731-00 | INCORRECT GEAR ENGAGED |
| P1778-00 | INPUT-TURBINE SHAFT SPEED SENSOR "A" OUT OF RANGE HIGH |
| P177F-00 | OUTPUT SHAFT SPEED SENSOR OUT OF RANGE HIGH |
| P1B13-00 | PARK-BY-WIRE - UNINTENDED OUT OF PARK POSITION |
| P1B14-00 | PARK-BY-WIRE - UNINTENDED PARK POSITION |
| P1D25-00 | SHIFT CONTROL RATIONALITY |
| P1D77-00 | PARK SOLENOID RANGE/PERFORMANCE |
| P1D78-00 | PARK SOLENOID CIRCUIT LOW |
| P1D79-00 | PARK SOLENOID CIRCUIT HIGH |
| P1D8A-00 | PARK PAWL SOLENOID CIRCUIT LOW |
| P1D8B-00 | PARK PAWL SOLENOID CIRCUIT HIGH |
| P1D8F-00 | INCORRECT GEAR RATIO - CLUTCH 1 DEFECTIVE |
| P1D90-00 | INCORRECT GEAR RATIO - CLUTCH 2 DEFECTIVE |
| P1D91-00 | INCORRECT GEAR RATIO - CLUTCH 3 DEFECTIVE |
| P1D92-00 | INCORRECT GEAR RATIO - CLUTCH 4 DEFECTIVE |
| P1D93-00 | INCORRECT GEAR RATIO - CLUTCH 5 DEFECTIVE |
| P1D94-00 | TCM INTERNAL - SBW CALIBRATION MISMATCH |
| P1D95-00 | TCM CLUTCH FAILURE UNDETERMINED |
| P1D96-00 | INCORRECT GEAR RATIO: CLUTCH A OR B DEFECTIVE |
| P1D97-00 | INCORRECT GEAR RATIO: CLUTCH A OR D DEFECTIVE |
| P1D98-00 | INCORRECT GEAR RATIO: CLUTCH B OR D DEFECTIVE |
| P1D99-00 | INCORRECT GEAR RATIO: CLUTCH B OR E DEFECTIVE |
| P1D9A-00 | INCORRECT GEAR RATIO: CLUTCH C OR D DEFECTIVE |
| P1D9B-00 | INCORRECT GEAR RATIO: CLUTCH A OR E DEFECTIVE |
| P1D9C-00 | INCORRECT GEAR RATIO: CLUTCH A OR C DEFECTIVE |
| P1D9D-00 | INCORRECT GEAR RATIO: CLUTCH B OR C DEFECTIVE |
| P1D9E-00 | INCORRECT GEAR RATIO: CLUTCH C OR E DEFECTIVE |
| P1D9F-00 | INCORRECT GEAR RATIO: CLUTCH D OR E DEFECTIVE |
| P1DA0-00 | INCORRECT GEAR RATIO: CLUTCH A, B, OR C DEFECTIVE |
| P1DA1-00 | INCORRECT GEAR RATIO: CLUTCH A, B, OR E DEFECTIVE |
| P1DA2-00 | INCORRECT GEAR RATIO: CLUTCH B, C, OR E DEFECTIVE |
| P1DA3-00 | INCORRECT GEAR RATIO: CLUTCH B, D, OR E DEFECTIVE |
| P1DA4-00 | INCORRECT GEAR RATIO: CLUTCH B, C, OR D DEFECTIVE |
| P1DA5-00 | INCORRECT GEAR RATIO: CLUTCH C, D, OR E DEFECTIVE |
| P1DA6-00 | INCORRECT GEAR RATIO: CLUTCH A, C, OR D DEFECTIVE |
| P1DA7-00 | INCORRECT GEAR RATIO: CLUTCH A, D, OR E DEFECTIVE |
| P1DA8-00 | INCORRECT GEAR RATIO: CLUTCH A, B, OR D DEFECTIVE |
| P1DA9-00 | TRANSMISSION FLUID TEMPERATURE RATIONALITY |
| P1DAA-00 | TRANS TEMP UNDETERMINED |
| P1DAB-00 | VEHICLE SPEED UNDETERMINED |
| P1DAC-00 | ENGINE SPEED UNDETERMINED |
| P1DAD-00 | INPUT SHAFT/OUTPUT SHAFT DIRECTION CORRELATION |
| P1DAF-00 | INCOMPATIBLE LIMP IN ACTION REQUESTED |
| P1DB1-00 | TCM SYSTEM VOLTAGE EXCESSIVELY LOW |
| P1DB2-00 | ACTUATOR SUPPLY VOLTAGE "A" CIRCUIT |
| P1DB3-00 | TCM ECU RESET/RECOVERY OCCURRED |
| P1DB7-00 | TORQUE CONVERTER CLUTCH PERFORMANCE |
| P1DB8-00 | UNINTENDED TORQUE APPLIED WHILE IN NEUTRAL |
| P1DB9-00 | TCM ECU RESET - EXTENDED LOW VOLTAGE |
| P1DCD-00 | TCM MONITORING PROCESSOR PERFORMANCE - MULTIPLE CLUTCHES LOCKED UP |
| P1DCE-00 | TCM MONITORING PROCESSOR PERFORMANCE - INCORRECT DRIVING DIRECTION |
| P1DD0-00 | TCM MONITORING PROCESSOR PERFORMANCE - UNALLOWED PARK ENGAGEMENT |
| P1DDD-00 | TCM MONITORING PERFORMANCE - UNABLE TO DISENGAGE DRIVE OR REVERSE |
| P1DDE-00 | IGNITION RUN/START INPUT 1/2 CORRELATION |
| P1DF3-00 | ECU NOT INITIALIZED |
| P215C-00 | OUTPUT SHAFT SPEED - WHEEL SPEED CORRELATION |
| P2762-00 | TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT RANGE/PERFORMANCE |
| P2763-00 | TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT HIGH |
| P2764-00 | TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT LOW |
| P2784-00 | INPUT/TURBINE SPEED SENSOR "A"/"B" CORRELATION |
| U0001-00 | CAN C BUS |
| U0074-00 | DEDICATED POWERTRAIN (D-PT) CAN BUS OFF |
| U0100-00 | LOST COMMUNICATION WITH ECM/PCM |
| U0102-00 | LOST COMMUNICATION WITH TRANSFER CASE CONTROL MODULE / AWD |
| U0103-00 | LOST COMMUNICATION WITH ELECTRIC GEAR SHIFT MODULE |
| U0104-00 | LOST COMMUNICATION WITH CRUISE CONTROL MODULE |
| U0120-00 | LOST COMMUNICATION WITH STARTER/GENERATOR CONTROL MODULE |
| U0121-00 | LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE |
| U0140-00 | LOST COMMUNICATION WITH BODY CONTROL MODULE |
| U0155-00 | LOST COMMUNICATION WITH CLUSTER/CCN |
| U0401-00 | IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM |
| U0403-00 | IMPLAUSIBLE DATA RECEIVED FROM T-CASE |
| U0404-00 | IMPLAUSIBLE DATA RECEIVED FROM ESM |
| U0405-00 | INVALID DATA RECEIVED FROM CRUISE CONTROL MODULE |
| U0415-00 | IMPLAUSIBLE DATA RECEIVED FROM ABS |
| U0422-00 | IMPLAUSIBLE DATA RECEIVED FROM BODY CONTROL MODULE |
| U0423-00 | IMPLAUSIBLE DATA RECEIVED FROM CLUSTER/CCN |
| U0469-00 | INVALID DATA RECIEVED FROM STARTER/GENERATOR CONTROL MODULE |
| U11B9-00 | LOST COMMUNICATION WITH RF HUB |
| U11E3-00 | TCM LOST COMMUNICATION WITH ESM ON D-PT CAN |
| U11E4-00 | CAN COMMUNICATION MESSAGES MISSING |
| U1267-00 | NO VALID DATA AVAILABLE FROM ESM ON CAN-C OR CAN D-PT |
| U1401-00 | IMPLAUSIBLE ENGINE SPEED SIGNAL RECEIVED |
| U1408-00 | IMPLAUSIBLE BRAKE SIGNAL RECEIVED |
| U140D-00 | U140D-00 - IMPLAUSIBLE WHEEL SPEED SIGNALS RECEIVED |
| U1412-00 | IMPLAUSIBLE VEHICLE SPEED SIGNAL RECEIVED |
| U1461-00 | IMPLAUSIBLE DATA RECEIVED FROM ESM ON DPT |
| U1465-00 | IMPLAUSIBLE DRIVER SHIFT REQUEST SIGNAL RECEIVED |
| U1466-00 | IMPLAUSIBLE DRIVER SHIFT REQUEST SIGNAL RECEIVED ON D-PT CAN |
| U1489-00 | IMPLAUSIBLE DATA RECEIVED FROM RF HUB |
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.