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Sprinter ABS light, traction control light on
1. Check your wheel speed sensors, rough roads can cause the speed sensors to back out away from the tone wheel. Reseat them by tapping them back in until they stop against the tone ring. They will be bumped out slightly after a few miles to the correct depth by movement in the bearing.
2. Check your brake light switch, located at the top of the brake pedal lever. if it is stuck on or intermittently sticking on the truck thinks you are trying to slow down while you have your foot on the gas. Computers don;t like these kind of messages so it thinks you have a problem. Click, on goes the light.
3. Check your high mount brake light, we have seen shorts in this light that can cause this same issue.