I recently had my speedometer stop working after driving 100 continuous miles. After the initial 100 miles or so, it slowly backed down to no reading. I had to stop for gas, snacks, restroom break, and it started to work again...at least for the first 100 miles or so. It still works on short trips in town, and I don't notice any problems with it.
I spoke with a dealership service tech, he never actually looked at the vehicle, and he thought the cluster gauge was bad.
Any other thoughts as to what the problem might be? I really don't want to send it to the dealer as it will probably cost a lot of money if there are alternatives that I can check. Thank you
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If everything else works ok, the vehicle drives normally, and all the other gauges are working then you may have a bad speedometer servo motor. This servo is what actually moves the speedometer needle to match the speed you are driving at. The cluster would need to come out and be repaired to fix this problem if this is the case.
There is no speedo cable on 04 T.B. all electric. You can get the stepper motors on line 6 of them thats what that board takes& thats how they sell them. I did mine you can check online for instructions. It is not that hard to do I took the speedo board to my computer shop & he did a great job soldering the 6 stepper motors to the speedo board. there is a GM mec. who gives detailed instructions how to do it. He is fed up with how many he has done. & GM Rip off price to do it. your dealer wants $ 250.00 to $500.00 to fix your broken speedo problem. 6 steeper moters $35.00 to $45.00 on line & $50.00 to solder them. Good luck.
There was a recent class action law suit settled with GM for this exact problem. You can google gm speedometer lawsuit and get lots of information. Unforutunately for most people I think the warranty was limited to 7 years and 70,000 miles. Which isn't a lot of miles for most people.
If you car isn't covered by the warranty there is a way to "reset" the speedometer.
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.
At first you will probably actually hit the ignition and the engine will try to start.....just release it and try it again.
I know this because I have a 04 avalanche with 80,0000 miles and it has this problem about twice a month.