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08 Grand Prix GXP stalling speedo jumping

 
Old 10-02-2018, 04:19 PM
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Default 08 Grand Prix GXP stalling speedo jumping

Hi, I have an 08 Grand Prix GXP with just under 100,000. The problem Iím having is the speedometer jumps when I come to a stop or I am going under 30 mph. My car also stalls occasionally when this happens. I replaced the speed sensor, the battery, and the alternator and nothing has solved the problem. Any help would be much appreciated.
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Old 10-05-2018, 06:33 AM
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I'm not great at diagnosis... but I know at least enough.... to recommend to you that you just stop randomly replacing parts specifically like alternators and batteries... as I would expect if those expensive components were bad you'd be getting other more common symptoms.

I'm assuming no check engine light is being thrown?
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Old 10-05-2018, 08:40 AM
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Both the battery and alternator tested bad. There are no codes.
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Old 02-06-2019, 10:07 AM
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Default Gxp issue

Did you ever find out the problem? Mine is doing the same
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