Calibrate speedometer
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Cross-Country
Joined: Mar 2021
Posts: 61
Likes: 15
From: NW Louisiana
Calibrate speedometer
2020 XLT. Installed slightly taller tires. Speedometer is 2 mph off at 60 mph per gps. It was right on with previous tires. 2 different dealers say they can’t correct it and the last one suggested an after market programmer to true it up. Does this sound right?
Fleet Mechanic
Joined: Jan 2023
Posts: 1,343
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YouTube is a good start if you want to use Forscan, but you should read a little on what you need to do to stay out of trouble. Some forum users created a great resource:
https://www.ford-trucks.com/forums/1...ces-index.html
Buy the Forscan recommend adapter (OBD Link or Vlinker) because you are making changes, not just reading data. You don't need any irreversible problems a bad adapter can cause.
https://www.ford-trucks.com/forums/1...ces-index.html
Buy the Forscan recommend adapter (OBD Link or Vlinker) because you are making changes, not just reading data. You don't need any irreversible problems a bad adapter can cause.
Mountain Pass
Joined: May 2025
Posts: 187
Likes: 119
The dealer saying cannot be done is because of Ford software. If the dealer makes changes using outside software, the dealer has a liability that is not backed by Ford. If Ford software screws up, the dealer has a recourse through Ford, be it technical assistance, software development, etc.
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Joined: May 2005
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From: San Antonio, TX
You can use FORscan, as stated above. When I did my truck, 10 years ago, I used a Hypertech calibrator. My tires are spec's at 34.4", but that's unloaded. The reason I didn't use FORscan at the time was that I had a Mac laptop.
To get my speedometer to read correctly, I had to enter 33.25" into the calibrator to get it perfect. For what it's worth, nearly every F150 comes from the factory with the speedometer read about 3% fast. Check with a speedometer app that you can download on your phone, there are many in the app store.
To get my speedometer to read correctly, I had to enter 33.25" into the calibrator to get it perfect. For what it's worth, nearly every F150 comes from the factory with the speedometer read about 3% fast. Check with a speedometer app that you can download on your phone, there are many in the app store.
Last edited by JKBrad; Apr 18, 2026 at 08:59 PM.
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Cross-Country
Joined: Mar 2021
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From: NW Louisiana
Well, my 2 laptops are Windows 7 and 10. Neither are suitable for 11. I pretty much do everything on my phone now. Messing around in that program is not something I am comfortable with. That’s the reason I went to 2 dealers to have an experienced person do it. I still have some extended warranty left and I wouldn’t want to give them an excuse to decline a repair. I may have to just live with it. Thanks for taking the time to reply all.
Last edited by Cliffblue; Apr 18, 2026 at 08:51 PM. Reason: More info
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Joined: May 2005
Posts: 8,234
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From: San Antonio, TX
Well, my 2 laptops are Windows 7 and 10. Neither are suitable for 11. I pretty much do everything on my phone now. Messing around in that program is not something I am comfortable with. That’s the reason I went to 2 dealers to have an experienced person do it. I still have some extended warranty left and I wouldn’t want to give them an excuse to decline a repair. I may have to just live with it. Thanks for taking the time to reply all.
https://dalessuperstore.com/i-238994...hoCat0QAvD_BwE
Lead Driver
Joined: May 2015
Posts: 5,889
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From: Mts. S. of San Francisco
You can use FORscan, as stated above. When I did my truck, 10 years ago, I used a Hypertech calibrator. My tires are spec's at 34.4", but that's unloaded. The reason I didn't use FORscan at the time was that I had a Mac laptop.
To get my speedometer to read correctly, I had to enter 33.25" into the calibrator to get it perfect. For what it's worth, nearly every F150 comes from the factory with the speedometer read about 3% fast. Check with a speedometer app that you can download on your phone, there are many in the app store.
To get my speedometer to read correctly, I had to enter 33.25" into the calibrator to get it perfect. For what it's worth, nearly every F150 comes from the factory with the speedometer read about 3% fast. Check with a speedometer app that you can download on your phone, there are many in the app store.
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