TSB ITRM-26.A04 — Ford and Lincoln Software update
ITRM-26.A04 is a software update on file with NHTSA for 2 Ford and Lincoln models, 2025–2026 model years, filed and re-filed as 2 documents. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. 26C10 Recall remedy -Addresses instances where the trailer lights and trailer brakes may not function
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Worth checking your VIN against. ITRM-26.A04 is filed as a software update, which unlike an ordinary bulletin can mean free or reimbursed work when a vehicle qualifies. Ask a dealer using the document ID below, and check open recalls separately at nhtsa.gov/recalls.
Vehicles and model years ITRM-26.A04 names
| Vehicle | Model years |
|---|---|
| Ford Expedition | 2025, 2026 |
| Lincoln Navigator | 2025 |
Every document filed under ITRM-26.A04
Manufacturers re-issue a bulletin as the repair changes, and file separate copies for technicians and for owners. All of them carry the same number.
| Document ID | Filed | Type |
|---|---|---|
| ITRM-26.A04 Expedition | April 10, 2026 | Software update |
| ITRM-26.A04 Navigator | April 10, 2026 | Software update |
What ITRM-26.A04 covers
Electrical, Visibility & wipers, Transmission & drivetrain — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB ITRM-26.A04?
ITRM-26.A04 is a software update filed with NHTSA by Ford and Lincoln, covering 2 Ford and Lincoln models across the 2025–2026 model years. NHTSA's summary reads: 26C10 Recall remedy -Addresses instances where the trailer lights and trailer brakes may not function
Which vehicles does ITRM-26.A04 cover?
NHTSA's file names Ford Expedition (2025–2026); Lincoln Navigator (2025). 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 ITRM-26.A04 a recall, and is the repair free?
ITRM-26.A04 is filed as a software update, not a recall — but this is the kind of communication that can mean free or reimbursed work if your VIN qualifies. Take the number to a dealer and ask. Recalls are separate and always free; check yours by VIN at nhtsa.gov/recalls.
How do I get the full text of ITRM-26.A04?
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 ITRM-26.A04, 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 ITRM-26.A04. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.