2001 GMC Sierra 1500 Pickup Owner's Manual - Page 232

The Traction Assist System may operate on dry roads under some conditions. When this happens, you may notice a reduction in acceleration. This is normal and doesn't mean there's a problem with your vehicle. Examples of these conditions include a 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 TAS 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" in the Index. When the TRACTION OFF light is on, the TAS is off and will not limit wheel spin. Adjust your driving accordingly. The TRACTION OFF light will come on under the following conditions: D The Traction Assist System is turned off, either by pressing the TAS on/off button or turning off the automatic engagement feature of the TAS. operate in this gear. This is normal. D The transmission is in FIRST (1); TAS will not D The vehicle is driven on a severely rough road. When the vehicle leaves the rough surface, slows down or stops, the light will go off and TAS will be on again. This is normal. D A Traction Assist System, Anti-Lock Brake System or engine-related problem has been detected and the vehicle needs service. See "Traction Off Light" in the Index. The Traction Assist System, as delivered from the factory, will automatically come on whenever you start your vehicle. To limit wheel spin, especially in slippery road conditions, you should always leave the system on. But you can turn the TAS off if you ever need to. You should turn the TAS off if your vehicle ever gets stuck in sand, mud or snow and rocking the vehicle is required. See "Rocking Your Vehicle" in the Index. 4-10