Speedometer calibration question

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Nov 3, 2020 | 09:22 PM

Applejack23

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Joined: Oct 2020

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Speedometer calibration question

Hey, I have 2020 f-350 that’s getting a lift and I’m plannning I’m running 285-75-18 tires.
my question is, can the dealership adjust the speedometer? I have read that it can be done for stock size tires and this is stock size for the tremor.
can it be done? If so how do I tell them to do it?
thanks for your help

Nov 3, 2020 | 09:51 PM

smikesF350

Tuned

Joined: Sep 2020

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I believe I have see postings regarding folks using FORScan to make changes to the calibration for various tire sizes. You might want to do a search here and the the FORScan site.

Nov 3, 2020 | 10:40 PM

PNW_F250

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Joined: Feb 2020

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The kind folks that figure out the values to use in Forscan haven't figured that out yet for the 2020s.

Nov 4, 2020 | 04:40 AM

westracing01

More Turbo

Joined: Nov 2019

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From: Northwest CT

Side question on this, do you have to recalibrate the speedometer? I mean, if you don't, other than the speedo and odometer being off, will it mess anything up on the truck?

Nov 4, 2020 | 05:44 AM

Poncho450

Lead Driver

Joined: Oct 2014

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From: NY/Canada border

Quote:

Originally Posted by westracing01

Side question on this, do you have to recalibrate the speedometer? I mean, if you don't, other than the speedo and odometer being off, will it mess anything up on the truck?

Tires sized above a certain threshold would throw a code and light on previous models. I don't recall what the size was. Possibly 37's. The miserable search function on this may tell you something, it may not.
Also, I'm told the computer system on the 2020 is a little different and that's likely why our FORScan gurus are still hard at work sorting out and adding mods for the 2020 model year.

Nov 4, 2020 | 06:24 PM

MBaldo

Senior User

Joined: Mar 2019

Posts: 486

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From: Salt Lake City

I run 35's on a 20" wheel and I'm exactly 5 mph over. You can download mph apps that you can verify when driving.

Nov 4, 2020 | 06:28 PM

Spooledsrt

Tuned

Joined: Dec 2018

Posts: 483

Likes: 24

Quote:

Originally Posted by Applejack23

https://www.roughcountry.com/speedom...hoCsEkQAvD_BwE

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Nov 5, 2020 | 12:18 PM

ZooDad

Retired guy fixn stuff

Joined: Mar 2009

Posts: 3,219

Likes: 1,228

From: East TN

Quote:

Originally Posted by Applejack23

Using ForScan give these values a shot. You may get a CEL (P160 code) but shouldn't as it is very close to the stock Tremor size
BCM 726-15-01 xxxx xxxx 0Axx
BCM 726-15-02 80xx xxxx xxxx

Post up your results

ZooDad