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The gauge cluster is electronic and the speedo is controlled by a small stepper motor that is a very common failure. Check with your local Chevy dealer to see if they will honor the recall for this (there is a TSB for it) Other wise visit our enthusiast forum for all the help you need to fix it yourself and save hundreds of dollars.

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Q: Why does your 2005 Chevy Trailblazer read 20mph sitting still?
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