2006 Hummer H2 Owner's Manual - Page 263

Traction Control System (TCS) Your 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, the system applies the brakes to limit wheel spin. The Traction Control System may operate on dry roads under some conditions. When this happens, you may notice a reduction in acceleration or a pumping sound. This is normal and doesn't mean there's a problem with your 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 your vehicle is in cruise control when the TCS begins to limit wheel spin, the cruise control will automatically disengage. When road conditions allow you to safely use it again, you may re-engage the cruise control. See Cruise Control on page 3-11. Another feature of this system is the Traction Control 2 (TC2) mode. TC2 should be selected for improved traction and system performance when the vehicle is on loose surfaces such as deep sand or mud. To enter this mode, press the TC2 button located on the instrument panel to the right of the steering wheel. TC2 only operates in the following transfer case modes: • Four-Wheel-High Lock • Four-Wheel-Low Lock • Four-Wheel-Low Lock and Rear Axle Lock See Locking Rear Axle on page 4-10 for more information on the rear axle lock. It will not operate in Four-Wheel-High. If the TC2 button is pressed while in Four-Wheel High, the light will flash for about 15 seconds and then go out. The light should also come on briefly when you turn the ignition key to RUN; if it doesn't see your dealer for service. 4-9