B17C5 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B17C5 – Trailer Tow Reverse Lamp Control Circuit Short To Battery


B17C5 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


B17C5 Possible Causes


Faulty Trailer Tow Reverse Lamp,Trailer Tow Reverse Lamp harness is open or shorted,Trailer Tow Reverse Lamp circuit poor electrical connection,Faulty Body Control Module (BCM)


B17C5 Description


Four relays are used to provide voltage to the Trailer Tow connector. The trailer tow relays are used to switch fused battery voltage directly to the Trailer Tow connector when requested. The trailer tow relays are activated through a ground path provided by the Body Control Module (BCM). The BCM sets the OBDII code when it detects a short to voltage on the Trailer Reverse Lamp Control circuit.