GM Service Manual Online
For 1990-2009 cars only

Traction Control System (TCS) Automatic Transmission

Your vehicle may have 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 one or both of the rear wheels are spinning or beginning to lose traction. When this happens, the system reduces engine power and may also up-shift the transmission to limit wheel spin.

You may feel or hear the system working, but this is normal.

If your vehicle is in cruise control when the traction control system 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 .

The Traction Control System operates in all transmission shift lever positions except for first gear. This is normal. The system is deactivated when the transmission is shifted into first gear. In this situation, the traction control system warning light on the instrument panel cluster will come on. This is normal. The system can upshift the transmission only as high as the shift lever position you've chosen, so you should use the lower gears only when necessary. See Automatic Transmission Operation .


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When the system is on, this warning light will come on to let you know if there's a problem.

When this warning light is on, the system will not limit wheel spin. Adjust your driving accordingly.

If the Traction Control System (TCS) is on and you drive faster than 100 mph (161 km/h), the system will turn off and the TC warning light will come on. The TCS will turn back on and the TC warning light will go out once the vehicle speed falls below 90 mph (145 km/h). See Traction Control System (TCS) Warning Light .

To limit wheel spin, especially in slippery road conditions, you should always leave the Traction Control System on. But you can turn the system off if you ever need to. You should turn the system off if your vehicle ever gets stuck in sand, mud or snow and rocking the vehicle is required. See Rocking Your Vehicle to Get It Out and If Your Vehicle is Stuck in Sand, Mud, Ice, or Snow for more information.


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To turn the system on or off, press the traction control button located on your center console switchbank. See Center Console Switchbank for more information.

When you turn the system off, the Traction Control System warning light will come on and stay on. If the Traction Control System is limiting wheel spin when you press the button to turn the system off, the warning light will come on and the system will turn off right away.

You can turn the system back on at any time by pressing the button again. The Traction Control System warning light should go off.