It's stored in the cluster. You'll get what was on the other car. If you do a search, you will find that cluster failure on GMs is very common and there are many places that repair them. They can reprogram the mileage too but I don't know what the procedures are to get that done. They might want your old cluster. I think they can retrieve the mileage even if it is broken.
Monday, May 2nd, 2011 AT 5:02 PM