More than likely you have a bad instrument cluster (very common on these). But the best way to test these is with the proper scan tool. You need to perform a sweep test.
If you are good with working on cars, you can remove the instrument cluster, disassemble it and look for bad solder joints.
If you would rather not mess with it, you can send it to these folks.
http://www.mrwhizard.com and they can repair it and send it back to you.
Yes We can repair your Speedometer or Instrument Cluster and save you...
Hope this helps!
Could be a few thing's . Hooking up a scan tool an checking for DTC'S - diagnostic trouble codes would be the first thing to do., viewing speed input data to the PCM - engine computer from the VSS - vehicle speed sensor . Also if the PCM see's this input it outputs this info on the class 2 serial data communication network to the instrument cluster . The instrument cluster has a microprocessor with logic programmed into it , an controls a electric motor to set the speedometer needle . GM had bad Stepper motors in their instrument clusters from 2003 to 2006 .
Does the vehicle shift ok , no running problems ? Any light's lit on the instrument cluster ? check engine etc....
How to repair GM Instrument Cluster Speedometer Gauge Stepper
SOURCE: my speedometer stop working
It's a bad stepper motor (the device that operates the needle on the gauge). Replacements can be found on eBay for approx. $4.95 each - just search for "stepper motor". Just got 6, to replace all of mine.
SOURCE: speedometer stopped working
this vehicle has an electronic speed sensor located on the trans i do believe but im pretty sure this is your problem change it and your cured
SOURCE: can u get the sliding to work manually since mine
there is a button in the overhead console to turn off the automatic sliding door
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