C2502 Code: Meaning, Causes, and Symptoms | OBD2 Codes
C2502 – DTCM Signal Plausibility Failure
C2502 Possible Symptoms
Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)
C2502 Possible Causes
Faulty Anti-Lock Brake System (ABS) Module,Faulty Electric Power Steering (EPS) Module,Faulty Powertrain Control Module (PCM),Faulty Transmission Control Module (TCM)
Any time the key is on and the engine has been running for at least 4 seconds the Drivetrain Control Module (DTCM) continuously runs a diagnostic check on the Transmission Control Module (TCM), Anti-lock Brake System (ABS) Module, Electric Power Steering (EPS) Module and the Powertrain Control Module (PCM) to ensure that the Modules can honor any Terrain Selector Switch request. If the DTCM receives a message from one of these other modules indicating that they have had a failure, the DTCM forces the terrain selector switch into AUTO mode and will disable the terrain selection option to the customer. This DTC is set in the DTCM to inform the Technician that the AWD system is working properly but the driving mode can not be selected because another system in the vehicle has failed.