B1591 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1591 – Autolamp Delay Decrease Circuit Failure


B1591 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


B1591 Possible Causes


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


B1591 Description


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