[vgames33]

Take a look at the speed sensor...... It tells the computer how fast the car is going (obviously). The TCS will use the speed sensors to detect a slipping wheel and tell the computer to get it under control. They do this by (correct me if I'm wrong) cutting fuel to lower power output and pulsing the brakes (via ABS). You probably just need a new speed sensor (or maybe a wire broke internally and shorts out once you hit 45-50 mph). I don't think they're too hard to replace.