Ford bulletin SSM 54387
What it saysSome 2021-2024 Mustang Mach-E vehicles may exhibit a condition where the interior propulsion sound feature does not remain active and deactivates immediately. NHTSA’s full summary ↓
Ford filed this with NHTSA as a service bulletin dated Nov 18, 2025, received Dec 1, 2025, about the engine. It names 4 model years (2021–2024). 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 2021-2024 Mustang Mach-E vehicles may exhibit a condition where the interior propulsion sound feature does not remain active and deactivates immediately. This may be due to the audio control module (ACM) configuration. To restore the functionality of this feature, download and run the "ACM - Enable Engine Sound Enhancement and Active Noise Control" application in the Ford Diagnosis and Repair System (FDRS) scan tool. In cases where the ACM is replaced, this routine will run during the "ACM - Programmable Module Installation (PMI)" application. Make sure to follow the FDRS on-screen instructions carefully. For claiming, use causal part 18C869 and labor operation numbers 12651D and 12651D4.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| SSM 54387 | Service bulletin | Nov 18, 2025 | 11025810 | PDF, 68 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 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 4 model years this bulletin names have filed 669 complaints with NHTSA since 2015. 322 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.
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
The HVBJB (high-voltage battery junction box) subassembly in ALL Ford Mach-e vehicles has known defects with insufficiently robust main contactors that are known to fail under normal charging and driving conditions as outlined in NHTSA Campaign Number 22V412000.
2022 Ford Mustang Mach-E · Engine · filed with NHTSA Mar 6, 2023 · ODI 11510276
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 engine
Source: same model, same component group1 other manufacturer communication filed against the Ford Mustang Mach-E under the same component group (engine), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| SSM 53968 | Service bulletin | Jun 25, 2025 | Some 2024-2025 F-150 Lightning and 2025 Mustang Mach-E vehicles may exhibit various intermittent inoperative climate control symptoms with d… |
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 54387 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 54387 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 54387 cover?
The manufacturer filed it against 4 model years: 2024 Ford Mustang Mach-E, 2023 Ford Mustang Mach-E, 2022 Ford Mustang Mach-E, 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.