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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.

Posted on May 22, 2011


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1 Answer

My 06 grand prix speedometer keeps fluctuating and I can feel the difference. What is causing it?

Could be so many things, from bad speed sensor to simple tune up item. Run diagnostic tests, such as vacuum gauge, fuel pressure, real time data check, etc

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My speed odometer shows I am driving 90 mph but I am only going 50mph. What is the problem?

the speedometer cluster is at fault. the speed sensor will not cause this problem

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Can I go from 215/60/16 tires on a Pontiac Grand Prix to 225/60/16?

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Jan 10, 2010 | 1994 Pontiac Grand Prix

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The speedometer needs to be reset it is working but not correctly

Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Grand Prix instrument cluster repair

Dec 31, 2009 | 2005 Pontiac Grand Prix

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2001 pontiac grand prix with speedometer intermittently inoperative.

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.


Hope this helps. Thanks for using FixYa!

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Oil pressure

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.

Aug 07, 2009 | 1990 Pontiac Grand Prix

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

Oct 13, 2008 | 2002 Pontiac Grand Prix

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