Weird Speedometer Issue
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More Turbo
Joined: Feb 2020
Posts: 633
Likes: 84
From: AL
Weird Speedometer Issue
My 2016 had 275/65/20 BFGs on it when I bought it, and had never been recalibrated. Hence what led me down the forscan path. After some tinkering I got it calibrated pretty much dead on. That was about 50k ago. I have noticed the past year or so, I can get in the truck and the Speedometer will be dead on. 65mph on the digital display, 65 on a GPS app. Without rhyme or reason, some drive cycles it's off. 65 on dash, 56-57mpg on app. I have tried restoring as built data, then recalibrating with no change. It's completely random, sometimes it's off, sometimes it's on. Thinking it was variation in the iPhone app, I tried it with a Garmin standalone GPS. Same thing. Friend borrowed my truck and said he thought he was going awful slow to be running 75mph, so he pulled up his app, 64mph. On the return trip, it was dead on. Anyone had any experience with this issue?
Lead Driver
Joined: May 2015
Posts: 5,887
Likes: 359
From: Mts. S. of San Francisco
I'd be more inclined to think you have some zones where the GPS gets bad data. GPS signals are notoriously weak and interference prone, and you will likely encounter zones of poor readings.
Lead Driver
Joined: Jun 2005
Posts: 8,475
Likes: 727
From: Calgary Canada
GPS is not particularly accurate over short distances for speed like that. It's the nature of the errors in the location measurements that instantaneous speeds are really just "ballpark" numbers.
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