Ford bulletin 21G01 S4
What it saysCertain 2021 Model Year F-150 and Mustang Mach-E Vehicles with Ford Co-Pilot360™ Active 2.0 Prep Package (Includes Ford BlueCruise Prep Kit) - BlueCruise Module Programming NHTSA’s full summary ↓
Ford filed this with NHTSA as a service bulletin dated May 15, 2024, received Jun 6, 2024, about the forward collision avoidance. It names 2 model years (2021). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationCertain 2021 Model Year F-150 and Mustang Mach-E Vehicles with Ford Co-Pilot360™ Active 2.0 Prep Package (Includes Ford BlueCruise Prep Kit) - BlueCruise Module Programming
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 21G01 S4 | Service bulletin | May 15, 2024 | 11001141 | PDF, 3,731 KB |
What the document itself lists
The manufacturer titles it “Optional Product Improvement Program 21G01 – Supplement #4”.
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| OVER-THE-AIR | — | — |
Read by machine from the document NHTSA serves (133 pages), read Sep 30, 2026. A part number is shown only where it matches Ford’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
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The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Doing the repair yourself, or pricing it before the shop does? Search the part by fitment on eBay Motors — the listing and the price are the seller’s.
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Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 2 model years this bulletin names have filed 1,662 complaints with NHTSA since 2015. 192 of them name Forward Collision Avoidance — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
The contact owns a 2021 Ford F-150 Hybrid. The contact stated that while driving the vehicle, several safety features would not operate as intended. While driving in reverse, the rear cross-traffic alert would sometimes malfunction and not alert the driver that a vehicle or an object or pedestrian was near the rear of the vehicle.
2021 Ford F-150 · Forward Collision Avoidance · filed with NHTSA Feb 1, 2022 · ODI 11449705
If any of the passengers are unbuckled and the seat chime is on the car does not have an audible forward collision or pedestrian warning alert sound
2021 Ford Mustang Mach-E · Forward Collision Avoidance · filed with NHTSA Jan 6, 2022 · ODI 11446432
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the forward collision avoidance
Source: same model, same component group8 other manufacturer communications filed against these Ford models under the same component group (forward collision avoidance), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| SSM 55071 | Service bulletin | Aug 5, 2026 | Some 2025-2026 Aviator/Explorer/Expedition/F-150/Mustang Mach-E/Navigator vehicles may exhibit the hands-free BlueCruise feature intermitten… |
| TSB 26-2206 | Service bulletin | May 1, 2026 | This article updates TSB 23-2146. Reason for update: clarify prior approval requirements Some of the vehicles listed in the Model statement… |
| TSB 26-2199 | Service bulletin | Apr 30, 2026 | This article supersedes TSB 26-2021. Reason for update: to clarify prior approval requirements in the Service Procedure. Some of the vehicle… |
| TSB 26-2021 | Service bulletin | Jan 31, 2026 | This article supersedes TSB 25-2156 to update the Service Procedure and Labor Time Allowance. Some of the vehicles listed in the Model state… |
| SYNC-25.2.1.6.X | Over-the-air update | Jul 17, 2025 | Quality improvements include: -Latest software update for BlueCruise Activation |
| 25-OTA SYNC-25.2.1.6.5 MACHE | Over-the-air update | May 14, 2025 | "Quality improvements include: -Latest SYNC deployment to enable "BlueCruise" |
| 25-OTA BC-CS-25.02.02 F-150 | Over-the-air update | May 1, 2025 | "Quality improvements include: -Module configuration settings update to ensure BlueCruise functilonality" |
| 25-OTA BC-CS-25.02.01 MACHE | Over-the-air update | May 1, 2025 | "Quality improvements include: -Module configuration settings update to ensure BlueCruise functionality" |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Ford, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Ford 21G01 S4 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the 21G01 S4 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way.
Which vehicles does 21G01 S4 cover?
The manufacturer filed it against 2 model years: 2021 Ford F-150, 2021 Ford Mustang Mach-E. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.