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Old 02-11-2016, 11:39 AM   #1
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Speedometer TOO SLOW

I have a 2015 SE and no exterior mods have been performed. Since I got the car (July 2015) my speedometer has read 2 MPH too slow. I wouldn't have an issue if it was too fast but when I have my cruise set at 65 my actual speed is 67. Verified with 2 GPS and Radar gun. My digital readout and needle match perfectly, but both are 2MPH too slow. Dealership told me to set my speedometer at 60 and count mile-markers. Seriously.

Questions are:

1) Is this a warranty issue?
2) Can anything be done?
3) Can dealership fix it?


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Old 02-11-2016, 12:36 PM   #2
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GPS speedos are always 2 ticks faster than actual ground speed. This is due to the fact that consumer level GPS is not as reliably accurate as an onboard reading and so to cover their butts the manufacturers set them this way. I learned this after tuning my car and having concerns about mph vs. kph since my tuner is in the USA and I am in Canada. Every test I did had the GPS 2km faster at cruise, so further research and consultation with service techs uncovered the GPS fact.

As for the radar gun I dunno, my only guess would be it might not have been calibrated or calibrated correctly. Hop into any other Focus and run the same test with GPS you'll get the same results, I'm willing to bet a dozen donuts on it.
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Old 02-11-2016, 01:37 PM   #3
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GPS speedos are always 2 ticks faster than actual ground speed. This is due to the fact that consumer level GPS is not as reliably accurate as an onboard reading and so to cover their butts the manufacturers set them this way. I learned this after tuning my car and having concerns about mph vs. kph since my tuner is in the USA and I am in Canada. Every test I did had the GPS 2km faster at cruise, so further research and consultation with service techs uncovered the GPS fact.

As for the radar gun I dunno, my only guess would be it might not have been calibrated or calibrated correctly. Hop into any other Focus and run the same test with GPS you'll get the same results, I'm willing to bet a dozen donuts on it.
I've used 2 different Garmin GPS units as well as 2 cellphone GPS units and all showed 2MPH faster than what actual speed was.

Thinking that was an anomaly, I tried it in a Fusion, F150, and a Toyota. All of their speedometers read EXACTLY the same as each GPS device....

schrodingersbox You owe me a dozen donuts.

Last edited by jayjax; 02-11-2016 at 03:26 PM.
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Old 02-11-2016, 01:49 PM   #4
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Can't say what adjustments the Dealer computer can do offhand, if they can the amount off at 60 might be a std. to work from.

Just for interest, what tire size came on the car? (odd thought)
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Old 02-11-2016, 02:09 PM   #5
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My speedo is off by 2mph as well, I just compensate for it. If I want to do exactly 65, I set it at 63.
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Old 02-11-2016, 03:23 PM   #6
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Quote:
Originally Posted by KamelReds View Post
My speedo is off by 2mph as well, I just compensate for it. If I want to do exactly 65, I set it at 63.
KamelReds Sure, I know to compensate for it, but it's an annoyance. Have you ever tried getting it fixed?
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Old 02-11-2016, 03:27 PM   #7
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Quote:
Originally Posted by sailor View Post
Can't say what adjustments the Dealer computer can do offhand, if they can the amount off at 60 might be a std. to work from.

Just for interest, what tire size came on the car? (odd thought)
Standard 16
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Old 02-11-2016, 03:29 PM   #8
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Is it a constant 2 mph across the range (i.e. x+2 @ x), or 2 @60, 1 @ 30, 0.5 @ 15, 4 @ 120?
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Old 02-11-2016, 03:30 PM   #9
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Originally Posted by TooOld View Post
Is it a constant 2 mph across the range (i.e. x+2 @ x), or 2 @60, 1 @ 30, 0.5 @ 15, 4 @ 120?
Yes. Doesn't matter the speed, it's always 2MPH too slow.
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Old 02-11-2016, 03:33 PM   #10
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Quote:
Originally Posted by jayjax View Post
Yes. Doesn't matter the speed, it's always 2MPH too slow.
What pressure are you running?

An overinflated tire has a larger diameter and thus covers a greater distance with each axle turn. The result is that the odometer under-reports the actual distance covered, and the speed will also be less than what it normally would be

How does tire pressure affect mileage accuracy? | GPS Systems
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