B1590 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1590 – Autolamp Delay Increase Circuit Short To Ground

 

B1590 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B1590 Possible Causes

 

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

 

B1590 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.