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Old 11-13-2018, 10:30 AM   #1
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Speedometer Reading Way Off?

Hi
I just picked up our new 2019 FR3 33DS a few days ago. On the drive home from the dealer (about 400 miles of travel) I noticed that between my GPS speed reading and the Speedometer on the coach differs by 10 MPH.

The Coach stated Im traveling 60 MPH while the GPS says 50 MPH. GPS is pretty accurate, and while I know there may be some slight differences 10 MPH seems excessive.

How can this be? This is a brand new coach

Has anyone else seen or experienced this? I definitely will take or discuss with Ford as I would assume it is a warranty item that needs to be fixed or repair.
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Old 11-13-2018, 10:40 AM   #2
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I agree that 10mph seems a little excessive......GPS units are really pretty damned accurate considering everything about their tracking abilities.

However, if you’re reading 60 on the speedo and the GPS says 50, you shouldn’t ever get a speeding ticket
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Old 11-13-2018, 10:55 AM   #3
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time it between milepost - if you hit a mile in 1 minute, then you know you're traveling
60 miles per hour
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Old 11-13-2018, 10:58 AM   #4
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.......but he might be speeding before he gets to that next milepost.
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Old 11-13-2018, 11:39 AM   #5
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True, speeding tickets aside, or wondering why a caravan of cars are honking their horns at me when I am "driving the speed limit" has me confused Service adviser just told me over the phone I was probably looking at KPH and not MPH. After 50 years of Driving I think I know the difference.
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Old 11-13-2018, 12:18 PM   #6
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It's likely that the chassis was programmed for the wrong sized tires. Should be an easy fix to reprogram it to the correct tire size.
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Old 11-13-2018, 12:25 PM   #7
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Also, you may want to point out to that service rep (trying not to insult his intelligence the way he insulted yours, of course) that if you were looking at the KPH numbers, your speedometer would read "80" (assuming a true speed per the GPS at 50 MPH). I guess it's a lot easier to blame someone else than fix the probable problem (See Bama Rambler's post, which would be my first guess for a discrepancy that large).
Good luck!
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Old 11-13-2018, 12:40 PM   #8
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Most likely cause is the wrong plastic speedometer gear in the transmission for your tire and axle ratio combination. Being a new Ford chassis, Ford should cover it under warranty. Your salesman has used car salesmanitis also known as anal-cranial inversion.
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Old 11-13-2018, 12:54 PM   #9
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Quote:
Originally Posted by Boomerweps View Post
Most likely cause is the wrong plastic speedometer gear in the transmission for your tire and axle ratio combination.
I'm assuming that the speedo is part of a fly-by-wire system in a 2019 chassis, so it should just be a reprogramming issue, per Bama Rambler.

That said, your diagnosis of the service rep's unfortunate condition was spot on!!
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Old 11-13-2018, 03:12 PM   #10
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A Big problem is that your ODOMETER may be racking up too many miles. An error of 20% high is a lot.
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