2006 GMC Yukon Owner's Manual - Page 224

SERVICE TIRE MONITOR If your vehicle has the tire pressure monitor system, this message will be displayed if one or more of the tire monitor sensors have malfunctioned or if all of the tire monitor sensors have not been programmed successfully. See your GM dealer. Pressing any of the four DIC buttons will acknowledge the message and clear it from the DIC display. If your vehicle does not have the four DIC buttons, pressing the trip odometer reset stem will acknowledge the message and clear it from the DIC display. The message will reappear at each ignition cycle until the system has been serviced. See your GM dealer. When the STABILITY SYS ACTIVE message is on, you should continue to steer in the direction you want to go. The system is designed to help you in bad weather or other difficult driving situations by making the most of whatever road conditions will permit. STABILITY SYS (System) DISABLED The STABILITY SYS DISABLED message will turn on when you press the StabiliTrak® button, or when the stability control has been automatically disabled. To limit wheel spin and realize the full benefits of the stability enhancement system, you should normally leave StabiliTrak® on. However, you should turn StabiliTrak® off if your vehicle gets stuck in sand, mud, ice, or snow and you want to rock your vehicle to attempt to free it, or if you are driving in extreme off-road conditions and require more wheel spin. See If Your Vehicle is Stuck in Sand, Mud, Ice or Snow on page 4-44. To turn the StabiliTrak® system back on, press the StabiliTrak® button again. STABILITY SYS (System) ACTIVE You may see the STABILITY SYS ACTIVE message on the DIC. It means that an advanced computer-controlled system has come on to help your vehicle continue to go in the direction in which you are steering. StabiliTrak® activates when the computer senses that your vehicle is just starting to spin, as it might if you hit a patch of ice or other slippery spot on the road. When the system activates, you may hear a noise or feel a vibration in the brake pedal. This is normal. 3-64