Question about Chevrolet Cavalier

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Sometimes the speedometer will read 100 mph when we are actually going 55 and sometimes it will jump around or sometimes it will not work at all. All other guages seem to work fine

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Speed sensor is going bad.

Posted on Apr 06, 2011

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My Speedometer reads faster than than actual speed and the reading to actually increases ex at 20 mph it reads 28 mph and at 55 mph it reads 80 mph. How can I correct this?


Do you have any codes ? Have you modified your steering/suspension in any way ? Have you changed the size of your tires ? If you can share more detail information, this would help

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Hi have a 1998 chevy convertion van 163 miles.runs very good...lately the speedometer gets crazy after 40 mph and when get to 100mph try to shot off.... Any sugestions?


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Sounds like the speedometer head. its cheaper to actually replace it rather than repair. find one close to your mileage . usually around $50.00

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sounds like speedometer cable is gone or the gears between the cable and transmission which makes the reduction for sppedometer if no cable on that year they have a sensor

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It is a 4x4 and I cant find the speed sensor that operates the speedometer. The speedometer sticks at 100mph at a dead stop. It also jumps around between 75 and 80 at random when I am only doing 45 mph.


On our Lincoln, the problem was the Alternator shorting and energizing the ground circuit with Positive juice. Our speedometer and odometer were both affected.

We had miles advancing and 45-50 MPH at a stop. Then inaccurate readings while the car was moving.

Car-stuff.com seems to have the best price for the actual speed sensor which is located in the differential @$11.94.

Please rate my solution and I hope I was helpful.

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Speedometer is jumping around


The speedometer cable needs lubricating. It can be removed from the bottom where it connects to transmission, coated with graphite and reinstalled.

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Speedometer Gauge Slipping - Inaccurate Reading


I had a car that did this to me. It started happening last year so I took it in and they were baffled. Lesson learned never take a car to a big chain store for a difficult diagnosis.They just told me to let my car warm up for 5 minutes and it would be fine. If I let it warm up it was good. This winter it started doing it again but it would do it all the time even after I let it warm up. I never bothered bringing it in again because it was dieing. If you are truly concerned take it into a mechanic ( a good one) and have them diagnose it. Your spedometer cable could just be wearing out.

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bad speed senor on trans

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