Susan Syme, you are probably talking about the Enhanced Traction System (ETS) warning light. It will turn on when the engine computer sees a problem. The ETS system monitors wheel speed via the Anti-lock Brake System (ABS). If the ETS system sees a wheel spinning due to snow, ice, rain etc., the ETS computer sends a request to the vehicle's engine computer to reduce torque. If your light is coming on when you are driving in slippery conditions, this is normal. If it staying on all the time, the ETS is either turned off or you have another problem. I would suggest to have it scanned and see if it throws any codes. Most of the larger automotive accessory places like Autozone offer a free scan. Hope this helps, good luck.