B2601 BUICK, CADILLAC, CHEVROLET, GMC, PONTIAC: DRL RELAY CONTROL CIRCUIT SHORTED TO GROUND
POST UPDATED IN June, 2023
B2601 BUICK, CADILLAC, CHEVROLET, GMC, PONTIAC: DRL RELAY CONTROL CIRCUIT SHORTED TO GROUND
The DRL (Daytime Running Lamps) relay belongs to the daytime running lamp system. They are lights that are installed on many modern vehicles. The relay is controlled by the BCM (Body Control Module).
The ignition coil of this relay receives positive ignition voltage, and the BCM grounds the control circuit of the relay to achieve its activation. In case this control circuit presents some weird conditions due to a short to ground, the B2601 OBDII diagnostic code will be set on Buick, Cadillac, Chevrolet, GMC, and Pontiac vehicles.
The OBD2 B2601 fault code is set for the following reasons:
To fix the DTC B2601 OBDII code, try this: