Tire Size / Speedometer Calibration (2021+) FORScan Code for F-150
Your truck
Add Tire Size / Speedometer Calibration (2021+) to a worksheet
$9.99
Choose the year, trim, engine, and drivetrain. Nothing is filled in until you pick it.
Sample
Sample worksheet
This is a sample of the layout, not a worksheet for your truck. The paid sheet uses the mods you pick and leaves a blank for each original value. You write any change yourself in FORScan.
Sample rows for a 2021 F-150. These are 2021+ addresses. Auto Start/Stop is not in this sample.
| Module | Address | Your original value | Target value | Notes |
|---|---|---|---|---|
| BCM | 726-39-02 | ____________ | xxx0 xxxx xx-- | Sample layout. 2021+ Bambi Mode. |
| ACM | 727-01-01 | ____________ | xxxx xxxx 0x-- | Sample layout. 2021+ Fake Engine Noise. |
| BCM | 726-63-02 | ____________ | xxx0 xxxx xx-- | Sample layout. 2021+ Double Horn Honk Disable. |
Sample rows only. A purchased worksheet is built from your year, trim, engine, drivetrain, and selected mods. Worksheet purchases are non-refundable except where required by law.
Tire Size / Speedometer Calibration (2021+) is an advanced change that rewards careful backups for 2021–2026 Ford F-150 trucks, applied with FORScan over an OBD-II adapter. Corrects speedometer and trip mileage readings after fitting a different tire size. 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 2 as-built code rows 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. Accurate speed and mileage on non-stock tires.
Why F-150 owners use it
Accurate speed and mileage on non-stock tires
Where this fits
This page is for 2021–2026 trucks. The circumference is stored in millimetres across two BCM addresses, which is not the 2015–2020 row at Tire Size / Speedometer Calibration. The 2021 F-150 hub has the other items for that first 14th-generation year. Back up both original values using the backup guide, then use the worksheet builder. The FAQ explains what the worksheet includes.
Free guide before checkout
Read the free tire-size calibration guide first
Use it for speed checks, original-value backup, and the P160A/wrench-light reports. Those reports are strongest on 2015–2020 trucks, so confirm the 2021+ addresses on this page before you write.
Worksheet rows
2
Modules
1
Estimated time
~10 min
Compatibility
2021-2026
How you'll apply Tire Size / Speedometer Calibration (2021+)
The DIY process from start to finish — backup-first and, where possible, reversible.
Back up your originals first
Before changing anything, use FORScan to read and record the current value of each of the 2 rows in the Body Control Module (BCM). Your worksheet leaves a blank beside every row for exactly this.
Write the worksheet values
Enter the 2 target rows from your worksheet one at a time. Most owners finish Tire Size / Speedometer Calibration (2021+) in about 10 minutes with a laptop and a FORScan-compatible OBD-II adapter.
Cycle the ignition and verify
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.
Roll back anytime
Because Tire Size / Speedometer Calibration (2021+) is fully reversible, you can put every original value back later and return to stock whenever you want.
Compatible F-150 years
Review year-specific FORScan worksheet context before adding this mod to your build.
Before you write values
Make backups, confirm the adapter can see the truck, and review the FAQ before applying worksheet values.
Printable worksheet preview
Customers get a clean worksheet with original-value blanks, target values, completion checks, and module notes.
| Module | Address | Target value | Notes |
|---|---|---|---|
| BCM | 726-15-01 | xxxx xxxx AB-- | First two hex digits of the tire circumference in MILLIMETRES |
| BCM | 726-15-02 | CDxx xx-- | Last two hex digits of the same millimetre value |
Risk and safety notes
Requires careful backups and confidence working in FORScan.
Required modules
Tire Size / Speedometer Calibration (2021+) FORScan FAQ
Is Tire Size / Speedometer Calibration (2021+) safe to do on my F-150?
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.
Is Tire Size / Speedometer Calibration (2021+) reversible?
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.
Which modules does Tire Size / Speedometer Calibration (2021+) change?
It writes 2 code rows to the Body Control Module (BCM). Each row is listed in your worksheet with its address and target value.
How long does Tire Size / Speedometer Calibration (2021+) take with FORScan?
Most owners finish Tire Size / Speedometer Calibration (2021+) in about 10 minutes once they have the worksheet, a laptop, and a FORScan-compatible OBD-II adapter.
What F-150 years does Tire Size / Speedometer Calibration (2021+) work on?
Tire Size / Speedometer Calibration (2021+) applies to 2021–2026 F-150 trucks. Compatibility can still vary by trim, package, and module software version, so confirm against your own as-built data.
Anything to watch out for with Tire Size / Speedometer Calibration (2021+)?
The 2021+ platform stores tire circumference in millimetres across two addresses, not in centimetres at one address like 2015-2020 — do not reuse a 2015-2020 value here. A PCM relearn is required after changing this. Measure or calculate the real rolling circumference, verify against GPS, and keep the original values.
Related Cluster & Display mods
Other FORScan changes in the same category you can add to the same worksheet.
Seatbelt Chime Disable
Disables seatbelt reminder chime
Door Ajar Chime Disable
Disables door ajar warning chime
Startup Chime Disable
Disables the three "doo-doo-doo" startup chimes
Cluster Quick Boot
Removes factory animation on cluster startup
Engine & Transmission Temp Display
Shows engine and transmission temps above gauges (8" clusters only)
Turbo Boost Gauge Display
Enables the turbo boost gauge display on supported turbocharged trucks