Question about Pontiac Grand Prix

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Going 50 speedometer shows 90 on grand prix 06

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Tire size been changed, different transmission or differiential changed is the most common cause for that. If that's the case and you can find what the changed item came out - make, year, model, etc. and get the gear off the end of the speedometer where it goes into the transmission and put it in yours it should work ok. You have a different gear ratio and have to compasate for it with the speed o meter gears.
dhgill1949

Posted on May 22, 2011

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1 Answer

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Hello! It sounds as if you have a wheel speed sensor that is failing. The wheel speed sensor calculates the wheel/tire revolutions and sends this information to the speedometer, which then displays that information as MPH/KPH. On 97-06 Grand Prix's this and the ABS sensor are the same module, and in order to replace, you must replace the entire hub assembly. Here is a view of the hub assembly from the back side of the hub/wheel assembly. You may want to inspect the sensor wires for any fraying, loose connections, etc.

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Hope this helps. Thanks for using FixYa!

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If there is no noise when the pressure shows zero, your engine is probably fine but the sensor is shot. Cost on these is probably under $50 US and replacement is normally easy.

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your intake manifold is busted thats a thousand dollar job i know cuz my grand prix does the same thing

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