Question about 1994 Pontiac Grand Am

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Speedometer reads speed higher than actually going

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Its eather the prom or speed sencer

Posted on Sep 20, 2009

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Make sure you tires are the right size that the car was made with, when ppl customize vehicles they have this problem. Or your speedometer might be going out

Posted on Jul 25, 2009

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Do you have custom wheels and tires of a different size installed than the originals? This will mess up your speedo reading.

Posted on Jun 26, 2009

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Posted on Jan 02, 2017

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My 05 Focus speedometer is wacky. All other gauges and systems work fine. The speedometer needle doesn't go to zero when vehicle stops moving.


Sounds like the speedometer is faulty. If the speed sensor were the problem, the odometer would not work correctly, the transmission would not shift correctly, and the check engine light would be on.

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I need to verify something about your vehicle. Are youan the original owner and did your speedometer suddenly start reading slower, and was reading normally before? Or did you just find out recently because you got a ticket or somebody clocked your speedometer by riding along side you? If you are not the original owner, I would check the tire height rating from the manufacturer versus the rating of the tire you have on the vehicle now. If the manufacturer installed a "G" series and you have a "H" series, for example, your speedometer will read slower than your actual speed as the "H" series is a taller tire. The higher the letter in the series, the taller the tire will be. (larger in diameter)
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check your vehicle speed sensor located at the rear of the transmission it may be faulty. What model is it and what transmission/engine do you have?

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