Ford bulletin SSM 55021
What it saysSome 2025-2026 Bronco/Bronco Sport/Corsair/F-150/F-Super Duty/Maverick/Mustang/Mustang Mach-E/Ranger vehicles may exhibit a no audio/sound condition. NHTSA’s full summary ↓
Ford filed this with NHTSA as a service bulletin dated Jul 20, 2026, received Jul 21, 2026, about the electrical system. It names 21 model years (2025–2026). 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 communicationSome 2025-2026 Bronco/Bronco Sport/Corsair/F-150/F-Super Duty/Maverick/Mustang/Mustang Mach-E/Ranger vehicles may exhibit a no audio/sound condition. This may be due to the software in the audio control module (ACM). To determine if it is a software concern, disconnect the vehicle's 12-volt battery cables for 10 minutes and reconnect. If the concern is still present, continue with normal diagnostics in Workshop Manual (WSM), Section 415-00 Information and Entertainment System > General Information > Diagnosis and Testing and repair as necessary outside of this article. If the no audio/sound concern is resolved, reprogram the ACM using the latest software level of the Ford Diagnosis and Repair System (FDRS). For claiming, use causal part 18C869 and labor operations 10654C, 12651D and 12651D4.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| SSM 55021 | Service bulletin | Jul 20, 2026 | 11035106 | PDF, 66 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: 2025 Ford F-550 SD; 2026 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 19 model years this bulletin names have filed 462 complaints with NHTSA since 2015. 110 of them name Electrical System — 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.
Truck lost all electrical power while backing a trailer up. Engine died, no steering, no brakes, no power on dash, no emergence brakes, no power to door locks, no power to windows. If vehicle had been moving any faster no telling what could have been. Vehicle was towed to ford dealership and zero reasons for such a total loss of power.
2026 Ford F-250 Super Duty · Electrical System · filed with NHTSA Apr 6, 2026 · ODI 11729384
The trailer light control module is intermittently causing trailer light faults messages and signal failures. This is associated to recall 26C10. The software update doesn’t correct the problem. Ford does not have the hardware on hand to replace the failing part. This is a safety issue for us who are on the road towing travel trailers
2026 Ford F-350 Super Duty · Electrical System · filed with NHTSA Sep 16, 2026 · ODI 11764803
If the vehicle sits for more than 36 hours, it enters a deep sleep mode and develops an unresolved battery drain issue, rendering it inoperable. This vehicle has been in the shop four times with three battery replacements having less than $30,000 MI if a person or to drive this out of town or park at a rest stop, it could lead them…
2025 Ford Maverick · Electrical System · filed with NHTSA Oct 8, 2026 · ODI 11769796
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 group381 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 |
|---|---|---|---|
| TSB 26-2449 | Service bulletin | Oct 22, 2026 | This bulletin supersedes 26-2428. Reason for update: to update the Service Procedure to remove the fuel tank isolation valve replacement and… |
| 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 55240 | Service bulletin | Oct 12, 2026 | Some 2021-2024 Bronco vehicles may exhibit an illuminated red brake warning indicator with diagnostic trouble code (DTC) C0049:01 stored in… |
| 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 55237 | Service bulletin | Oct 12, 2026 | Some 2025-2026 Mustang GTD vehicles built on or before 28-Sep-2026 may exhibit one or more of the following hydraulic system warning message… |
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 SSM 55021 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 SSM 55021 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 SSM 55021 cover?
The manufacturer filed it against 21 model years: 2026 Ford Bronco, 2025 Ford Bronco, 2026 Ford Bronco Sport, 2025 Ford Bronco Sport, 2026 Ford F-150, 2025 Ford F-150 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.