tai27yiuop, did you figure out the issue? I have this EXACT issue - my tach goes to zero and the traction light comes on at the same time. I restart the car and tach functions just fine and traction light is off. It has been happening for months, but then a couple times lately I got a check engine light - plugged in the reader and the code pointed to CPS, so I'm thinking maybe that's in my future to replace this...