What Would Cause My Speedometer To Just Stop Working

I have a 2004 Monte Carlo and this evening just out of the blue when I parked it to pick up pizza I noticed that the speedometer was stuck at 70 mph. The car was turned off and was reading that speed. It had been reading correctly beforehand. I cranked it back up and it continued to read 70 mph. On the way home it kept going higher and higher until it maxed out at 120 plus (it couldn’t go any higher). Is this a common thing that happens? We just had a bad cold spell where the temps got down to the teens (if that makes any difference). I had been driving for about an hour before this happened so the car was plenty warm. Any suggestions would be greatly appreciated. Thanks

Answers for The Question

  1. david z
  2. wi_saint
  3. Ron / Yogi
  4. dodge man
  5. stallion1948_lloyd