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Tire Size / Speedometer Calibration is an advanced change that rewards careful backups for 2015–2020 Ford F-150 trucks, applied with FORScan over an OBD-II adapter. Updates tire circumference value for speedometer calibration. It is fully reversible and typically takes about 10 minutes to write once your worksheet is in hand.
The change touches the Body Control Module (BCM), and your F-Config worksheet lists all 1 as-built code row with the module, address, and target value. Each row includes a blank for your original value so you can back up before writing changes and roll back later. Helps correct speedometer readings after tire size changes.
Helps correct speedometer readings after tire size changes
Worksheet rows
1
Modules
1
Estimated time
~10 min
Compatibility
2015-2020
The DIY process from start to finish — backup-first and, where possible, reversible.
Before changing anything, use FORScan to read and record the current value of each of the 1 row in the Body Control Module (BCM). Your worksheet leaves a blank beside every row for exactly this.
Enter the 1 target row from your worksheet one at a time. Most owners finish Tire Size / Speedometer Calibration in about 10 minutes with a laptop and a FORScan-compatible OBD-II adapter.
Turn the key off and back on, then confirm the change behaves as expected before moving on. If anything looks off, stop and compare against the originals you recorded.
Because Tire Size / Speedometer Calibration is fully reversible, you can put every original value back later and return to stock whenever you want.
Review year-specific FORScan worksheet context before adding this mod to your build.
Make backups, understand the tool requirements, and review the FAQ before applying worksheet values.
Customers get a clean worksheet with original-value blanks, target values, completion checks, and module notes.
| Module | Address | Target value | Notes |
|---|---|---|---|
| BCM | 726-12-01 | xxxx **** xxxx | Use calibrated tire circumference value from the tire-size worksheet |
Requires careful backups and confidence working in FORScan.
It is rated advanced. It is well within reach for a careful DIYer, but back up your original values and work through the worksheet one row at a time.
Yes. This change is fully reversible as long as you record your original as-built values first. Your worksheet leaves a blank for each original value so you can roll back to stock.
It writes 1 code row to the Body Control Module (BCM). Each row is listed in your worksheet with its address and target value.
Most owners finish Tire Size / Speedometer Calibration in about 10 minutes once they have the worksheet, a laptop, and a FORScan-compatible OBD-II adapter.
Tire Size / Speedometer Calibration applies to 2015–2020 F-150 trucks. Compatibility can still vary by trim, package, and module software version, so confirm against your own as-built data.
Changing tire circumference can cause DTCs or a wrench icon on some trucks. Verify with GPS and keep original values.
Other FORScan changes in the same category you can add to the same worksheet.
Disables seatbelt reminder chime
Disables door ajar warning chime
Disables the three "doo-doo-doo" startup chimes
Removes factory animation on cluster startup
Shows engine and transmission temps above gauges (8" clusters only)
Enables the turbo boost gauge display on supported turbocharged trucks