2008 Pontiac Grand Prix Owner's Manual - Page 241

If the 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 safe use of it, the cruise control can be used again. See Cruise Control on page 3-12. Adding non-GM accessories can affect your vehicle's performance. See Accessories and Modifications on page 5-3 for more information. This symbol comes on the Driver Information Center (DIC) when the ETS is limiting wheel spin. Enhanced Traction System (ETS) If the vehicle has the 3.8L V6 engine and Antilock brakes, it has an Enhanced Traction System (ETS) 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 front wheels are spinning or beginning to lose traction. When this happens, the system reduces engine power and may also upshift the transmission to limit wheel spin. If the vehicle is in cruise control when ETS begins to limit wheel spin, the cruise control will automatically disengage. When road conditions allow safe use of it, the cruise control can be used again. See Cruise Control on page 3-12. ETS operates in all transmission shift lever positions. But the system can upshift the transmission only as high as the chosen shift lever position, so use the lower gears only when necessary. See Automatic Transmission Operation on page 2-28. 4-7