I have a 2002 Pontiac Sunfire that has an ABS, Traction Control and Service light that keeps appearing after driving for a few minutes. Usually comes on after hitting a crack or pothole in the road. The brake pedal pulsates multiple times and then all three lights appear and I lose my ABS and Traction Control. Anyone know what could be causing this? Maybe loose or shorted wiring? Thanks.

Pat Fogarty wrote:I have a 2002 Pontiac Sunfire that has an ABS, Traction Control and Service light that keeps appearing after driving for a few minutes. Usually comes on after hitting a crack or pothole in the road. The brake pedal pulsates multiple times and then all three lights appear and I lose my ABS and Traction Control. Anyone know what could be causing this? Maybe loose or shorted wiring? Thanks.

It is the ground, or one of the main grounds that go from engine / trans. Also, you probably have a short in one of your ABS wires...and/or a sensor is going bad.

Either case can cause this.




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Could it be something with one of the wheel speed sensors?

I'm willing to bet it's the wheel speed sensor. Had one go bad after bumping into it while changing sway bar bushings. I'd be driving, hit a bump and the same symptoms occurred. Hard part is figuring out which one. I knew because I bumped the one. Stupidly easy to fix though, 60$ wiring harness. Cut the wiring from the old and splice the new. Maybe an hour, if that.