Question about 2004 GMC Sierra

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The speedometer on my 04 gmc sierra is stuck reading speed about 40 mph over actual speed? can it be reset?

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Sadly, no. What has happened is that the tiny servo motor that moves the speedometer needle is failing. When I run into these we remove the dash assembly and send it out to be repaired, usually by a dealer although there are other companies that can do this too. Usually they replace all the servo motors and backlight bulbs during the repairs but make sure you ask if they do so just to be sure.

Posted on Jul 05, 2010

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You can turn the ignition slowly like you are going to start the engine. There is a very small "dead" space where you will see your guage lights go off.

What you want to do is cycle the ignition switch from off to that dead space. Each time you do it your stuck speedometer will move towards zero about 10 mph. So if its stuck on 40 you will have to cycle it at least 4 times.

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