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2011 GMC Sierra Crew Cab speedometer off by 10mph too fast


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Ok, so I’ve posted about this before on here, and several suggested getting it tuned because the original owner probably had larger tires on here. Well I had the dealership recalibrate ir back to factory settings for the factory tire size that’s on it and it’s still 10mph too fast on speedo. I’ve had suggestions about getting the stepper motor replaced. I replaced the VSS originally, thinking that may be going bad but it’s not. I know in Park the needle is below 0, and when I put it in Drive the needle is above the 0 mark when my door is on brake. My scanner even shows the wrong speed as well. So would replacing a stepper motor make the scan tool show the correct speed when the new stepper motor is replaced. 

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2 hours ago, Lawman86 said:

Ok, so I’ve posted about this before on here, and several suggested getting it tuned because the original owner probably had larger tires on here. Well I had the dealership recalibrate ir back to factory settings for the factory tire size that’s on it and it’s still 10mph too fast on speedo. I’ve had suggestions about getting the stepper motor replaced. I replaced the VSS originally, thinking that may be going bad but it’s not. I know in Park the needle is below 0, and when I put it in Drive the needle is above the 0 mark when my door is on brake. My scanner even shows the wrong speed as well. So would replacing a stepper motor make the scan tool show the correct speed when the new stepper motor is replaced. 

I figured out what it was, the needle on the speedometer was in the incorrect position. The guy who restores gauges says that it looks like someone had replaced the stepper motor at one time and didn’t put the needle back where it was supposed to be. So, there goes $30 for a VSS, and $60 for a recalibration of the speedometer. 

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