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Shouldn't need reprogramming. I removed the cluster from my 04 Silverado and sent it in for repair and replacement of the bulbs. It was out of my truck for 2 weeks. When I got it back everything worked just fine, no problems at all.
You will have to have the cluster repaired. If you are handy, you can take the cluster out yourself. There a number of vendors on Ebay who repair clusters.
The new Gm line From 1998 till present are known for instrument cluster problems. Make sure that there isnt a new calibration to correct this problem ( at the dealer ) and if not you will need a new instrument cluster. Hope this helps.
There's 9 screws in the plastic piece that surrounds the instrument cluster and the lower knee guard, remove those screws and pull the plastic trim away from the dash, disconnect the switches on the left side as you pull outward. Then there's 4 screws that hold the actual instrument cluster in place, remove those and pull the cluster out, unplug the grey plug in the back of the instrument cluster and your done. You may need to set your parking brake and put your transmission in 1st gear of you have a column shifter model.
If the car runs fine with no noticable abnormality, then it is the gauge itself. Turn off the car remove the battery connection then connect them again, and see what happens.
Is it the entire instrument cluster or only some of the gauges? Check this page for more about Trailblazer instrument cluster problems - Trailblazer instrument cluster fix
On the 03-06 Trailblazer instrument clusters this is a common problem. It's caused by a failing stepper motor on the cluster's circuit board and can be repaired. Check out this page for more about how to get it fixed and other common cluster problems with the Trailblazers - Trailblazer tachometer broken
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