B1391 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1391 – Oil Level Switch Circuit Failure


B1391 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


B1391 Possible Causes


Faulty Oil Level Switch,Oil Level Switch harness is open or shorted,Oil Level Switch circuit poor electrical connection,Faulty Powertrain Control Module (PCM)


B1391 Description


The Powertrain Control Module (PCM) monitors the Oil Level Switch. The PCM sets the OBDII code when the Oil Level Switch is not to factory specifications.