Question about Pontiac Bonneville

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Speedometer normally will read 25mph when ur doing 70. gas gage dont work at all light will come on tho. tach works. will read around the correct speed once in a while. it is a 2004 model year.

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The speedometer is run by a small electric generator located at the transmision,the unit could be full of fluid or just worn out,either way it could need to be replaced.However with the other problems you are having first check the ground to the dash printed circuit as this may
be the culprit causing your problems as well!

Posted on Aug 05, 2010

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