GMC Sierra Owners Manual
Antilock Brake System (ABS) Warning Light
For vehicles with the Antilock Brake System (ABS), this light comes on briefly when the engine is started.
If it does not, have the vehicle serviced by your dealer. If the system is working normally the indicator light then goes off.
If the ABS light stays on, turn the ignition off. If the light comes on while driving, stop as soon as it is safely possible and turn the ignition off. Then start the engine again to reset the system. If the ABS light stays on, or comes on again while driving, the vehicle needs service.
If the regular brake system warning light is not on, the vehicle still has brakes, but not antilock brakes.
If the regular brake system warning light is also on, the vehicle does not have antilock brakes and there is a problem with the regular brakes.
See Brake System Warning Light on page 5‑27.
For vehicles with a Driver Information Center (DIC), see Brake System Messages on page 5‑43 for all brake-related DIC messages.
If the vehicle is a hybrid, see the hybrid supplement for more information.