B1D21 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1D21 – Remote Control Switch Signal Compare Failure


B1D21 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


B1D21 Possible Causes


Faulty Remote Control Switch,Remote Control Switch harness is open or shorted,Remote Control Switch circuit poor electrical connection,Faulty Body Control Module (BCM)


B1D21 Description


The Body Control Module (BCM) monitors the Remote Control Switch. The BCM sets the OBDII code when the Remote Control Switch is not to factory specifications.