C121C Code: Meaning, Causes, and Symptoms | OBD2 Codes

C121C – Torque Request Signal Denied


C121C Possible Symptoms


Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)


C121C Possible Causes


Faulty Anti-Lock Brake System (ABS) Module,Faulty Powertrain Control Module (PCM)


C121C Description


The Anti-Lock Brake System (ABS) Module monitors the Yaw Control/Traction Control System. The ABS Module sets the OBDII code if engine management relevant for Automatic Yaw Control/Traction Control System control can be accomplished.