Question about 2004 Chevrolet TrailBlazer

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2004 Chev Trailblazer Speedometer faulty

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 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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  • Anonymous Jan 05, 2009

    I had both the tach and speedo go out, seems like a common problem

  • Anonymous Jan 07, 2009

    I had the same problem, the speedometer would work and not work then it start at 90mph instead of 0, they told me there was a short somewhere in the car that they couldn't find but it must of been the cause. I took it to the Chevy dealer and it was about $600.00 to repair. Then a few months later they found a short in the ignition switch which was causing my car to die. They said it could of been the reason why the panel went out as well, that was about $200.00 to fix.



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Speed sensor. its located by the transmission.

Posted on Dec 29, 2008


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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.

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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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