Some 2025-2026 Bronco/Bronco Sport/Corsair/F-150/F-Super Duty/Maverick/Mustang/Mustang Mach-E/Ranger...
Ford technical service bulletin SSM 55021 for 2025-2026 Ford F-150, 2026 Ford Mustang and 2025-2026 Ford Ranger and others.
- Bulletin number
- SSM 55021
- Component
- Unknown or other
- Summary
- 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 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.
Vehicles covered
- Ford F-150 2025-2026 20252026
- Ford Mustang 2026 2026
- Ford Ranger 2025-2026 20252026
- Ford F-250 SD 2025-2026 20252026
- Ford F-350 SD 2025-2026 20252026
- Ford Bronco 2025-2026 20252026
- Ford Bronco Sport 2025-2026 20252026
- Ford Mustang Mach E 2025-2026 20252026
- Ford F-550 SD 2025-2026 20252026
- Ford F-450 SD 2025-2026 20252026
- Ford Maverick 2025-2026 20252026
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