Ford over-the-air update SYNC-26.2.1.6.5.2
What it says"26C10 Recall remedy -Addresses instances where the trailer lights and trailer brakes may not function" NHTSA’s full summary ↓
Ford filed this with NHTSA as an over-the-air update dated Mar 31, 2026, received Mar 3, 2026, about the electrical system — 4 documents under this number: SYNC-26.2.1.6.5.2 SD, SYNC-26.2.1.6.5.2 MachE, SYNC-26.2.1.6.5.2 Transit, SYNC-26.2.1.6.5.2 E-Trans. It names 15 model years (2021–2024). An over-the-air update is not a safety recall — there is no NHTSA campaign number and no federal requirement — but it is usually work the manufacturer pays for on the vehicles it names; the dealer checks the VIN against the manufacturer’s list.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communication"26C10 Recall remedy -Addresses instances where the trailer lights and trailer brakes may not function"
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| SYNC-26.2.1.6.5.2 SD | Over-the-air update | Mar 31, 2026 | 11030736 | PDF, 22 KB |
| SYNC-26.2.1.6.5.2 MachE | Over-the-air update | Mar 5, 2026 | 11030596 | PDF, 22 KB |
| SYNC-26.2.1.6.5.2 Transit | Over-the-air update | Feb 23, 2026 | 11029343 | PDF, 23 KB |
| SYNC-26.2.1.6.5.2 E-Trans | Over-the-air update | Feb 23, 2026 | 11029331 | PDF, 22 KB |
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.
Model years it names
Source: as the manufacturer filed themAlso filed against model years this site has no page for: 2023 Ford F-550 SD; 2024 Ford F-550 SD.
A 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 13 model years this bulletin names have filed 942 complaints with NHTSA since 2015. 404 of them name Electrical System, Exterior Lighting — 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.
On the 2021 Ford Mustang Mach-E, the 17 owners who gave an odometer reading for Electrical System reported it at a median of 30,696 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
The contact owns a 2023 Ford Mustang Mach-E. The contact stated while driving approximately 35 MPH, a MIL warning illuminated, with the message “Immediate Loss of Power” displayed. The contact stated that the vehicle shut off and the battery was drained. The contact stated that the vehicle stopped and independently shifted to park(P).
2023 Ford Mustang Mach-E · Electrical System · filed with NHTSA Dec 5, 2023 · ODI 11558645
After charging for the first time at a DC fast charge station to 80%, I resumed my trip and drove about 3 miles to merge onto the expressway, my screen panel said "safely stop now", with a turtle logo and battery icon coming on. my car then came to a complete stop within a few seconds in the middle of the on-ramp leaving me stranded.
2022 Ford Mustang Mach-E · Electrical System · filed with NHTSA Jun 6, 2023 · ODI 11525550
Multiple electrical issues related to dashboard controls, video sensors, head unit. Controls powering down while driving, sensors throwing multiple error messages. All since 1,500 miles. Ford could not figure out what the issue was so they replaced the wiring harness. After 2 months in the shop I got my vehicle back.
2023 Ford F-350 Super Duty · Electrical System · filed with NHTSA Mar 11, 2025 · ODI 11647774
In depth: 2023 Ford Mustang Mach-E electrical problems → · 2022 Ford Mustang Mach-E electrical problems → · 2021 Ford Mustang Mach-E electrical problems →
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 electrical system
Source: same model, same component group214 other manufacturer communications filed against these Ford models under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Ford list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 26-2431 v2 | Service bulletin | Oct 22, 2026 | This bulletin supersedes 26-2226. Reason for update: update the Service procedure for 2021-2022 F-150 3.5L EcoBoost vehicles with new Ford D… |
| TSB 26-2439 | Service bulletin | Oct 21, 2026 | Some of the vehicles listed in the Model statement above may exhibit the HVAC (heating, ventilation, and air conditioning) and radio system… |
| SSM 55255 | Service bulletin | Oct 15, 2026 | Some 2024-2026 F-Super Duty vehicles equipped with a 360-degree camera may exhibit a distorted or corrupted 360-degree camera image in the c… |
| TSB 26-2442 | Service bulletin | Oct 14, 2026 | This bulletin supersedes 26-2297. Reason for update: Add 2022-2025 Transit vehicles. Some of the vehicles listed in the model statement abov… |
| SSM 55239 | Service bulletin | Oct 12, 2026 | Some 2023-2026 F-Super Duty vehicles equipped with a trailer brake control module and built on or before 08-May-2026 may exhibit a "Trailer… |
| SSM 55208 | Service bulletin | Sep 25, 2026 | Some 2024-2026 F-150, 2025 Explorer/Aviator, 2025-2026 Expedition/Navigator, or 2026 F-Super Duty vehicles may exhibit diagnostic trouble co… |
| 26B07 | Other | Sep 24, 2026 | Recommended Repair Prior to Sale Customer Satisfaction Program 26B07 Certain 2021-2025 Model Year F-150 Lightning and Mustang Mach-E Vehicle… |
| TSB 26-2421 | Service bulletin | Sep 18, 2026 | This bulletin updates 25-2622. Reason for update: * Update the Service Procedure to: - Remove Step related connecting a battery charger - Ad… |
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 SYNC-26.2.1.6.5.2 a recall?
No. A over-the-air update 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 SYNC-26.2.1.6.5.2 repair free?
A over-the-air update is usually paid by the manufacturer on the vehicles it names, within the terms and time limit the document sets; the dealer checks the VIN against the manufacturer’s list.
Which vehicles does SYNC-26.2.1.6.5.2 cover?
The manufacturer filed it against 15 model years: 2023 Ford E-Transit, 2024 Ford F-250 Super Duty, 2023 Ford F-250 Super Duty, 2024 Ford F-350 Super Duty, 2023 Ford F-350 Super Duty, 2024 Ford F-450 Super Duty and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.