C111B Code: Meaning, Causes, and Symptoms | OBD2 Codes
C111B – Trailer Brake Power Control Module System Voltage Voltage Below Threshold
C111B Possible Symptoms
Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)
C111B Possible Causes
Faulty Trailer Brake Power Control Module,Trailer Brake Power Control Module harness is open or shorted,Trailer Brake Power Control Module circuit poor electrical connection
The chassis control module receives inputs from the trailer brake power control module; these inputs are used to determine trailer connection and the amount of voltage supplied to the trailer brakes. The trailer brake power control module detects a voltage below a calibrated threshold on the battery positive voltage circuit.