TSB SSM-55021 — Ford Service bulletin
SSM-55021 is a service bulletin on file with NHTSA for 8 Ford models, 2025–2026 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. Some 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…
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years SSM-55021 names
| Vehicle | Model years |
|---|---|
| Ford Bronco | 2025, 2026 |
| Ford Bronco Sport | 2025, 2026 |
| Ford F-150 | 2025, 2026 |
| Ford F-250 | 2025, 2026 |
| Ford F-350 | 2025, 2026 |
| Ford Mustang | 2026 |
| Ford Mustang Mach-E | 2025, 2026 |
| Ford Ranger | 2025, 2026 |
Every document filed under SSM-55021
| Document ID | Filed | Type |
|---|---|---|
| SSM 55021 | July 20, 2026 | Service bulletin |
What SSM-55021 covers
Electrical — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB SSM-55021?
SSM-55021 is a service bulletin filed with NHTSA by Ford, covering 8 Ford models across the 2025–2026 model years. NHTSA's summary reads: Some 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…
Which vehicles does SSM-55021 cover?
NHTSA's file names Ford Bronco (2025–2026); Ford Bronco Sport (2025–2026); Ford F-150 (2025–2026); Ford F-250 (2025–2026); Ford F-350 (2025–2026); Ford Mustang (2026); Ford Mustang Mach-E (2025–2026); Ford Ranger (2025–2026). A bulletin number can be re-issued against more vehicles later, so check the model-year list on this page against your own.
Is TSB SSM-55021 a recall, and is the repair free?
No. SSM-55021 is repair guidance the manufacturer sent its dealers, not a safety defect finding. You pay for the work unless the vehicle is still under warranty. Recall repairs, by contrast, are always free.
How do I get the full text of SSM-55021?
Take the document ID to a dealer's service desk, or search NHTSA's manufacturer-communications records. This page carries every document ID filed under SSM-55021, its date, and NHTSA's own summary from the public file.
Every number on this page is a count of records in the federal complaint, recall, and investigation files published by NHTSA's Office of Defects Investigation. This page lists only what NHTSA's manufacturer-communications file records under SSM-55021. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.