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


C111B Description


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.