Is your tachometer and odometer still working properly?
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Tuesday, December 22nd, 2009 AT 1:54 PM
FOSTROW
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All my guages work, tach, fuel odo etc just speedometer not, sometimes it will go up to 30k when I know I am well above that, passing cars going 100k
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Tuesday, December 22nd, 2009 AT 7:38 PM
BLUELIGHTNIN6
MECHANIC
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There is a technical service bulletin (TSB) for this issue. You should contact the GMC division at 1-866-996-9463 and ask them how to repair the TSB # 07187C, issued on March 20, 2009.