This light will come on briefly when you start the engine to show that it is working, then it will turn off.

If the light does not come on then, have it fixed so it will be ready to warn you if there is a problem.

If there is a problem with the anti-lock brake system, this light will come on and the ABS Fault message will appear on the trip computer display. See your GM dealer for service. The vehicle's brake system will still operate without ABS.

The ABS Fault message will stay on until the MODE button on the trip computer is pressed, but the light will stay on until the problem is fixed.

The anti-lock brake system warning light should come on briefly when you turn the ignition key to ON. If the light does not come on then, have it fixed so it will be ready to warn you if there is a problem.