2008 GMC Envoy Owner's Manual - Page 173

Antilock Brake System Warning Light For vehicles with the Antilock Brake System (ABS), this light comes on briefly when the engine is started. StabiliTrak® Service Light This light will come on briefly when the engine is started. That is normal. 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 the ABS light stays on, turn the ignition off, if the light comes on when you are 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 still stays on, or comes on again while you are driving, your vehicle needs service. If the regular brake system warning light is not on, your vehicle still has brakes, but not antilock brakes. If the regular brake system warning light is also on, your vehicle does not have antilock brakes and there is a problem with the regular brakes. See Brake System Warning Light on page 3-38. For vehicles with a Driver Information Center (DIC), see DIC Warnings and Messages on page 3-53 for all brake related DIC messages. This light will come on if a problem is detected in the StabiliTrak® system. For more information see StabiliTrak® System on page 4-6. 3-39