2009 GMC Acadia Owner's Manual - Page 258

4-6 Driving Your Vehicle The system may be heard or felt while it is working; this is normal. The 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, system noises may be heard and felt as a result of the brake-traction control working. It is recommended to leave the system on for normal driving conditions, but it may be necessary to turn the system off if the vehicle is stuck in sand, mud, ice or snow, and you want to "rock" the 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 4-15. If the system fails to turn on or activate, the StabiliTrak light along with one of the following messages will be displayed on the Driver Information Center (DIC): TRACTION CONTROL OFF, SERVICE TRACTION CONTROL, SERVICE STABILITRAK. If these conditions are observed, turn the vehicle off, wait 15 seconds, and then turn it back on again to reset the system. If any of these messages still appear on the Driver Information Center (DIC), the vehicle should be taken in for service. For more information on the DIC messages, see Driver Information Center (DIC) on page 3-47. 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 traction control disable button. Traction control can be turned on by pressing and releasing the traction control disable button if not automatically shut off for any other reason. When the traction control system is turned off, the StabiliTrak light and the appropriate traction control off message will be displayed on the DIC to warn the driver. The StabiliTrak light will flash on the instrument panel cluster when the system is both on and activated.