B1803 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1803 – Lamp Turn Signal Rear Output Circuit Open


B1803 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


B1803 Possible Causes


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


B1803 Description


The Body Control Module (BCM) monitors the Lamp Turn Signal Rear. The BCM sets the OBDII code when the Lamp Turn Signal Rear is not to factory specifications.