B1491 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1491 – Ignition Cylinder Sensor Circuit Failure


B1491 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


B1491 Possible Causes


Faulty Ignition Cylinder Sensor,Ignition Cylinder Sensor harness is open or shorted,Ignition Cylinder Sensor circuit poor electrical connection,Faulty Body Control Module (BCM)


B1491 Description


The Body Control Module (BCM) monitors the Ignition Cylinder Sensor. The BCM sets the OBDII code when the Ignition Cylinder Sensor is not to factory specifications.