2009 Hummer H3T Owner's Manual - Page 189

Driving Your Vehicle automatically disabled. See Full-Time Four-Wheel Drive on page 2-24 for more information. 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 it is necessary to "rock" the vehicle to attempt to free it. See If Your Vehicle is Stuck in Sand, Mud, Ice, or Snow on page 4-33. To Turn off TCS and StabiliTrak, press and hold the TCS/StabiliTrak button until the STAB SYS OFF message displays on the DIC. Press and release the TCS/StabiliTrak button again to turn StabiliTrak back on. See "Traction Control System (TCS)", following, for more information on turning TCS off and on. 4-7 Traction Control System (TCS) The vehicle has a Traction Control System (TCS) that limits wheel spin. This is especially useful in slippery road conditions. The system operates only if it senses that any of the wheels are spinning or beginning to lose traction. When this happens, TCS reduces engine power. The system may be heard or felt while it is working. This is normal and does not mean there is a problem with the vehicle. TCS can operate on dry roads under some conditions. When this happens, the system may be heard working or a reduction in acceleration may be noticed. This is normal and does not mean there is a problem with the vehicle. Examples of these conditions include hard acceleration in a turn, an abrupt upshift or downshift of the transmission or driving on rough roads. If cruise control is being used when TCS begins to limit wheel spin, the cruise control automatically disengages. The cruise control can be re-engaged when road conditions allow. See Cruise Control on page 3-9 for more information. TRACTION FAULT appears on the Driver information Center (DIC) when a TCS or antilock brake system problem has been detected and the vehicle needs service. When this message is on, the system will not limit wheel spin. To turn the system off, press and hold the TCS/StabiliTrak button until the traction off light comes on. This light comes on steady when TCS has been turned off. This light flashes when StabiliTrak is active.