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 TrackhawkFACTORY OEM SERVICE PROCEDURE
Module, Drivetrain Control (DTCM)
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| C1403-11 | TRANSFER CASE RANGE POSITION SENSOR - CIRCUIT SHORT TO GROUND |
| C1403-12 | TRANSFER CASE RANGE POSITION SENSOR - CIRCUIT SHORT TO BATTERY |
| C1403-8F | TRANSFER CASE RANGE POSITION SENSOR - ERRATIC |
| C1403-92 | TRANSFER CASE RANGE POSITION SENSOR - PERFORMANCE OR INCORRECT OPERATION |
| C1406-11 | TRANSFER CASE BRAKE CONTROL - CIRCUIT SHORT TO GROUND |
| C1406-12 | TRANSFER CASE BRAKE CONTROL - CIRCUIT SHORT TO BATTERY |
| C1406-92 | TRANSFER CASE BRAKE CONTROL - PERFORMANCE OR INCORRECT OPERATION |
| C140A-13 | TRANSFER CASE MOTOR CONTROL - CIRCUIT OPEN |
| C140A-92 | TRANSFER CASE MOTOR CONTROL - PERFORMANCE OR INCORRECT OPERATION |
| C140E-00 | TRANSFER CASE MOTOR BLOCKED |
| C1415-92 | TRANSFER CASE MOTOR CURRENT - PERFORMANCE OR INCORRECT OPERATION |
| C1438-00 | TRANSFER CASE DIFFERENTIAL CLUTCH WORN |
| C1444-00 | TRANSFER CASE MOTOR OVERUSE |
| C1472-92 | TRANSFER CASE CLUTCH CONTROL - PERFORMANCE OR INCORRECT OPERATION |
| C1476-00 | TRANSFER CASE CLUTCH POSITION OUT OF RANGE |
| C1477-4B | TRANSFER CASE CLUTCH - OVER TEMPERATURE |
| C2110-11 | SENSOR SUPPLY 1 VOLTAGE - CIRCUIT SHORT TO GROUND |
| C2110-12 | SENSOR SUPPLY 1 VOLTAGE - CIRCUIT SHORT TO BATTERY |
| C2129-16 | BATTERY VOLTAGE - CIRCUIT VOLTAGE BELOW THRESHOLD |
| C2129-17 | BATTERY VOLTAGE - CIRCUIT VOLTAGE ABOVE THRESHOLD |
| C2201-00 | FDCM/DTCM INTERNAL |
| C2206-00 | VEHICLE CONFIGURATION MISMATCH |
| C2221-00 | ELSD DTC PRESENT |
| U0001-00 | CAN C BUS |
| U0100-00 | LOST COMMUNICATION WITH ECM/PCM |
| U0101-00 | LOST COMMUNICATION WITH TCM |
| U0121-00 | LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE |
| U0136-00 | LOST COMMUNICATION WITH ELSD |
| U0140-00 | LOST COMMUNICATION WITH BODY CONTROL MODULE |
| U0212-00 | LOST COMMUNICATION WITH STEERING COLUMN CONTROL MODULE |
| U0401-00 | IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM |
| U0402-00 | IMPLAUSIBLE DATA RECEIVED FROM TCM |
| U0415-00 | IMPLAUSIBLE DATA RECEIVED FROM ABS |
| U0422-00 | IMPLAUSIBLE DATA RECEIVED FROM BODY CONTROL MODULE |
| U0429-00 | IMPLAUSIBLE DATA RECEIVED FROM SCM |
| U0437-00 | IMPLAUSIBLE DATA RECEIVED FROM ELSD |
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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