TSB 654.40 — Cadillac, Chevrolet and GMC Software update
654.40 is a software update on file with NHTSA for 4 Cadillac, Chevrolet and GMC models, 2025 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. • Fixes to help protect battery health. • Improvements to traction while driving on difficult terrain and using Four-Wheel Drive Low. During the update process, your radio may stay on up to 5 minutes after you exit the vehicle. This is expected behavior when an update package is…
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Worth checking your VIN against. 654.40 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 654.40 names
| Vehicle | Model years |
|---|---|
| Cadillac Escalade | 2025 |
| Chevrolet Suburban | 2025 |
| Chevrolet Tahoe | 2025 |
| GMC Yukon | 2025 |
Every document filed under 654.40
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 |
|---|---|---|
| 654.40 | June 2, 2026 | Software update |
| 654.40 | December 12, 2025 | Software update |
Questions buyers ask
What is TSB 654.40?
654.40 is a software update filed with NHTSA by Cadillac, Chevrolet and GMC, covering 4 Cadillac, Chevrolet and GMC models across the 2025 model years. NHTSA's summary reads: • Fixes to help protect battery health. • Improvements to traction while driving on difficult terrain and using Four-Wheel Drive Low. During the update process, your radio may stay on up to 5 minutes after you exit the vehicle. This is expected behavior when an update package is…
Which vehicles does 654.40 cover?
NHTSA's file names Cadillac Escalade (2025); Chevrolet Suburban (2025); Chevrolet Tahoe (2025); GMC Yukon (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 654.40 a recall, and is the repair free?
654.40 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 654.40?
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 654.40, 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 654.40. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.