TSB SSM-54674 — Ford and Lincoln Service bulletin
SSM-54674 is a service bulletin on file with NHTSA for 5 Ford and Lincoln models, 2021–2026 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. For 2021-2026 vehicles equipped with the 10R80 transmission, a new Transmission Clutch Circuit Leak Test has been introduced in the Ford Diagnosis and Repair System (FDRS). This test utilizes the pressure and vacuum transducer (PVT) when available. The Workshop Manual (WSM)…
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years SSM-54674 names
| Vehicle | Model years |
|---|---|
| Ford Expedition | 2021, 2022, 2023, 2024 |
| Ford Mustang | 2021, 2022, 2023, 2024, 2025, 2026 |
| Ford Ranger | 2021, 2022, 2023 |
| Ford Transit | 2021, 2022, 2023, 2024, 2025 |
| Lincoln Navigator | 2023, 2024 |
Every document filed under SSM-54674
| Document ID | Filed | Type |
|---|---|---|
| SSM 54674 | March 19, 2026 | Service bulletin |
What SSM-54674 covers
Transmission & drivetrain — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB SSM-54674?
SSM-54674 is a service bulletin filed with NHTSA by Ford and Lincoln, covering 5 Ford and Lincoln models across the 2021–2026 model years. NHTSA's summary reads: For 2021-2026 vehicles equipped with the 10R80 transmission, a new Transmission Clutch Circuit Leak Test has been introduced in the Ford Diagnosis and Repair System (FDRS). This test utilizes the pressure and vacuum transducer (PVT) when available. The Workshop Manual (WSM)…
Which vehicles does SSM-54674 cover?
NHTSA's file names Ford Expedition (2021–2024); Ford Mustang (2021–2026); Ford Ranger (2021–2023); Ford Transit (2021–2025); Lincoln Navigator (2023–2024). 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-54674 a recall, and is the repair free?
No. SSM-54674 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-54674?
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-54674, 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-54674. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.