B126A Code: Meaning, Causes, and Symptoms | OBD2 Codes

B126A – Drivers Door Interior Lock Switch General Electrical Failure

 

B126A Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B126A Possible Causes

 

Faulty Drivers Door Interior Lock Switch,Drivers Door Interior Lock Switch harness is open or shorted,Drivers Door Interior Lock Switch circuit poor electrical connection,Faulty Body Control Module (BCM)

 

B126A Description

 

The Body Control Module (BCM) sends voltage signals to the door lock control switches through the lock and unlock input circuits. When the lock or unlock switch is pressed, the corresponding voltage signal is routed to ground, signaling the BCM to lock or unlock the doors. The door lock control switches have a dedicated ground circuit. The BCM monitors the Drivers Door Interior Lock Switch. The BCM sets the OBDII code when the Drivers Door Interior Lock Switch is not to factory specifications.