B17B1 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B17B1 – Rear Right Trailer Turn Lamp Control Circuit Short To Battery


B17B1 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


B17B1 Possible Causes


Faulty Rear Right Trailer Turn Lamp,Rear Right Trailer Turn Lamp harness is open or shorted,Rear Right Trailer Turn Lamp circuit poor electrical connection,Faulty Body Control Module (BCM)


B17B1 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 Right Rear Trailer Turn Lamp Control circuit.