# Speedometer goes crazy **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [December 22, 2007, 4:35pm UTC](https://community.cartalk.com/t/speedometer-goes-crazy/8579 "2007-12-22T16:35:45Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![bwcarter](https://avatars.discourse-cdn.com/v4/letter/b/e0b2c6/32.png) [@bwcarter](https://community.cartalk.com/u/bwcarter)\ **Post date:** [December 22, 2007, 4:35pm UTC](https://community.cartalk.com/t/speedometer-goes-crazy/8579/1 "2007-12-22T16:35:45Z")
I have a 2003 Avalanche. Once every month or so while driving 70mph or so the speedometer goes to over 100mph. If I stop it might go back to 60mph then when I take off again it picks up from there. If I go 30mph it will register 90mph. I can get it to go back to zero if I stop and start the motor while in park. Every time I do this the mph will decrease about 5mph until I get to zero. Is this a bad speedometer sensor or a bad interment cluster? ---
**Author:** ![TXdealer](https://avatars.discourse-cdn.com/v4/letter/t/50afbb/32.png) [@TXdealer](https://community.cartalk.com/u/TXdealer)\ **Post date:** [December 23, 2007, 4:53am UTC](https://community.cartalk.com/t/speedometer-goes-crazy/8579/2 "2007-12-23T04:53:05Z")
It is the cluster. GM just announced a warranty extension on certain models. Call your dealer and see if you are covered. This is a very common problem. ---
**Author:** ![bwcarter](https://avatars.discourse-cdn.com/v4/letter/b/e0b2c6/32.png) [@bwcarter](https://community.cartalk.com/u/bwcarter)\ **Post date:** [December 23, 2007, 5:11pm UTC](https://community.cartalk.com/t/speedometer-goes-crazy/8579/3 "2007-12-23T17:11:40Z")
Thanks txdealer. Just looked it up and they are supposed to replace the cluster if the vehicle has under 70000 miles. Mine has 42000. I found out that this has been a problem with GM vehicles for a while now. Not only with the speedometer but also with all the gauges in the cluster.