I have a 2004 gmc 2500hd. The speedometer does not work correctly,it shows 120mph at 55mph. Do I need a new speedometer?
by 
Anonymous
ANSWERS: 3
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You would have to replace the instrument cluster. GM has extended the warrenty on some vehicles for this concern. If you have less than 70,000 miles on it, check with your local dealer to see if it is covered.
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ITS THE VSS OR VEHICLE SPEED SENSOR LOCATED AT THE VERY TAIL OF THE TRANSMISSION IT HAS TWO WIRES GOING IN IT AND 2 BOLTS UNBOLT IT AND POP IT OUT AND INSTALL THE NEW ONE PLEASE RATE THIS ANSWER
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I have a 2004 Tahoe had the same problem. I put ignition on but not started and put it in reverse turned the key to start (will not start because not in park) until speedo resests to zero. It fixed mine.
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