Question about 2007 Pontiac Grand Prix GXP Sedan
Speedometer issues with my gxp
Run the fault codes and check for TCM problems as it controls the gear shifting, speedo and rpm's gauge.
Posted on Mar 24, 2014
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Posted on Jan 02, 2017
SOURCE: transmission speedometer problem
This all can be caused by a defective Vehicle Speed sensor, also called a VSS, also run a test on the computer to see if any codes are in memory that will help to sort this problem out.
Posted on Nov 08, 2008
My car did the same thing. Look on your Transmission and find the speed sensor. Take the speed sensor out. It should only require taking off one nut. Then pull it out, the speed sensor is magnetic and can often times collect metal chips on it and that makes it unable to work properly. Once you clean it your car will be able to shift down properly because the speed sensor affects when your car shifts. Try it out. Good luck.
Posted on Dec 31, 2008
My 04 Montana did the exact same thing....multiple times. I took it to the transmission shop and had them scan it. Nothing came up, and they didn't have a real good solution. Did you ever find anything out?
Posted on Mar 12, 2014
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