we have a 2005 2500 hd silversdo with a speedo problem

the speedo reads over 120 and when you increas in speed it will continue to climb. I plugged in a computer reader/scanner and the computer reads the speed correctly but the speedo does not.

any ideas?

 

I had the same problem with a 2004 2500 HD. The only fix is to replace the gauge cluster. The company I worked for ran a fleet of GM trucks and this was a fairly common problem.

 

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Have you talked to the dealership, yet? They will be able to diagnose and repair this issue for you. Let me know how it goes with the dealership.
Breanne
Chevrolet Customer Service

 

X2-great answer.You should be able to a do your own repair.Here is a link to the possibility of a junk yard listing.

Car-Part.com--Used Auto Parts Market

 

I wouldn't use a junk yard cluster. You are just asking for the same problem over again maybe in the same or a different gauge. You need to replace the stepper motors in all the gauges to fix the problem. I think GM was taking care of this if under 90k miles. Check w/dealer to be sure.