I have been having erroneous speedometer problems with my vehicle for about 2 years now. The speedometer has a mind of its own. It will be working fine, and then go erroneous. It will get stuck at 60 MPH or higher. Sometimes it is even 120! This seems to occur more when it is raining. I have found that if I remove the negative terminal from the battery and reset the computer, it begins working again. I never know how fast I am going which can be very dangerous.
2003 Chevrolet Avalanche 1500 acceleration complaints
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