Question about 2003 GMC Envoy
You most likely have a bad servo motor inside the cluster which is what actually moves the speedometer needle. Similar servos also move the rest of the needles in the other gauges. I see this type of failure fairly often and the fix is to remove the cluster and have it sent out for repairs. There are several companies that can do this but I usually take the ones I encounter to my local GM dealer and have them send it out. I prefer to have the one that came out of the vehicle fixed and returned rather than exchanged but either method will work fine. Most places will replace all the servo's and bulbs. Haven't seen one fail again after being repaired. Hope this helps you find your problem!
Posted on Jul 14, 2010
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Posted on Jan 02, 2017
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The Engine and Automatic Transmission (not applicable to manual transmissions) in this vehicles drive train are fully electronically controlled by a computer called the PCM and TCM (Power Train Control Module, Transmission Control Module). When a problem like this or other drive-ability related problems occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM. Also always check fuel pressure for correct spec for your make and engine type.
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