I have a 2002 Grand Prix GT and it's been acting weird lately. Every so often I'll be driving along and the ABS light will come on along with the TCS off light. And it stays on until I turn my car off. Soon as I turn it off and back on it is back to the way it was before with no lights on. It has done this probably 3 or 4 times in the last week. Any help is appreciated.