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Can i change my speedometer using forscan for 295/65r20? Truck had 18s stock. There was a tire calibrator I found but it wont let me plug in my tire size for forscan codes.Thanks.
Speedometer Recalibration for Different Tire SizeBCM726-12-01xxxx xx00 xxxxxxxx xx4C xxxxForum comment: "Original tire size 275/70r18, New size 285/75r18. No DTC codes after 900 miles. This is a small change. Larger tire size changes do calibrate the speedometer but a check engine light will persist." The following can be used for a slightly larger calibration (ap
Go go to the spreadsheet in the above line I copied and in Forscan, in the BCM, line 726-12-01. You will change whatever is in the line where “00” is with 4C. Yours with the smaller 245 17’s will not say 00 in that position. But if you want to do 275/75*18 you want 4C in that position.
Inhave a 2017 F250 XL stock tires and rims 245/75R 17. Changing over to stock ford rims and tires 275/70R 18. What do need to change in forscan? Is it just this input? See attached photo
Last edited by Drew5150; May 11, 2018 at 12:34 AM.
Reason: Photo
I realize that this is an older thread, but I wasn't able to find a lot of data on this either. I was able to program in a 295/65R20 last night with no CEL as it's only about 3% larger than the largest available stock tire (275/65R20).
I used the Ford As-Built Tire Calculator from the Forscan forum to get the correct edits:
The code was in the BCM 726-12-01 line and needed to be xxxx 0A94 xxxx. I checked it this morning on my way to work with a speedometer app on my phone and I'm dead on. Hopefully this helps someone as this seems to be a popular size on our trucks.
Last edited by Gasgzlr; Nov 27, 2019 at 12:12 PM.
Reason: Add screen shot of tire calculator
From above: Speedometer Recalibration for Different Tire SizeBCM726-12-01xxxx xx00 xxxxxxxx xx4C xxxxForum comment: "Original tire size 275/70r18, New size 285/75r18. No DTC codes after 900 miles. This is a small change. Larger tire size changes do calibrate the speedometer but a check engine light will persist." The following can be used for a slightly larger calibration (ap
Yet if you go to the calculator provided in the above post is tells me it should be 0A80.
I wish I knew what the actual numbers mean so I knew which one was correct...
It’s even easier now. Open BdyCM (not as-built), go to tire circumference. Take the number that is currently there, multiply it by your actual speed, divide by your current displayed speed, write and you’re done. Converts to hex for you.
