Mechanics

SPEEDOMETER INTERMITTENT

2007 GMC Acadia • 6 cylinder FWD Automatic • 101,500 miles

I have a 2007 GMC Acadia, 100k miles that is having speedometer problems. When we start out the speedometer is fine, but after a short while it starts backing down. A lot of the times it goes all the way to zero, ticking up slightly. Other times it stops backtracking for a while, reading way below the actual speed, but not all the way to zero. Funny thing is, the Cruise control is fine. The Acadia has an digital readout on the dash when you "set" the cruise. That's how we figure out how fast we are actually going (that & a GPS). So. How do we fix the speedometer?

Thanks
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Gentilmoto
May 2, 2011.



Inspect and test the vehicle speed sensor

Rasmataz
May 2, 2011.