2008 GMC Sierra 1500 Pickup Owner's Manual - Page 264

The StabiliTrak® light will flash on the instrument panel cluster when the system is both on and activated. Traction control and StabiliTrak® can be turned on by pressing and releasing the StabiliTrak® button if not automatically shut off for any other reason. When the TCS or StabiliTrak® system is turned off, the StabiliTrak® light and the appropriate TCS off or StabiliTrak® off message will be displayed on the DIC to warn the driver. Your vehicle will still have brake-traction control when traction control is off, but will not be able to use the engine speed management system. See "Traction Control Operation" next for more information. When the traction control system has been turned off, you may still hear system noises as a result of the brake-traction control coming on. It is recommended to leave the system on for normal driving conditions, but it may be necessary to turn the system off if your vehicle is stuck in sand, mud, ice or snow, and you want to "rock" your vehicle to attempt to free it. It may also be necessary to turn off the system when driving in extreme off-road conditions where high wheel spin is required. See If Your Vehicle is Stuck in Sand, Mud, Ice, or Snow on page 4-32. You may also feel or hear the system working; this is normal. The traction control disable button is located on the instrument panel below the climate controls. The traction control part of StabiliTrak® can be turned off by pressing and releasing the StabiliTrak® button if both systems (traction control and StabiliTrak®) were previously on. To disable both traction control and StabiliTrak®, press and hold the button for five seconds. 4-6