TSB N25-250403 — Chevrolet and GMC Software update
N25-250403 is a software update on file with NHTSA for 2 Chevrolet and GMC models, 2023–2025 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. • Improves Check Engine Light accuracy. • Improves behavior of aero shutter system in freezing temperatures. 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 onboard the vehicle. Do…
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Worth checking your VIN against. N25-250403 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 N25-250403 names
| Vehicle | Model years |
|---|---|
| Chevrolet Silverado 1500 | 2025 |
| GMC Sierra 1500 | 2023, 2024 |
Every document filed under N25-250403
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 |
|---|---|---|
| N25-250403 | August 7, 2025 | Software update |
| N25-250403 | July 7, 2025 | Software update |
Questions buyers ask
What is TSB N25-250403?
N25-250403 is a software update filed with NHTSA by Chevrolet and GMC, covering 2 Chevrolet and GMC models across the 2023–2025 model years. NHTSA's summary reads: • Improves Check Engine Light accuracy. • Improves behavior of aero shutter system in freezing temperatures. 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 onboard the vehicle. Do…
Which vehicles does N25-250403 cover?
NHTSA's file names Chevrolet Silverado 1500 (2025); GMC Sierra 1500 (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 N25-250403 a recall, and is the repair free?
N25-250403 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 N25-250403?
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 N25-250403, 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 N25-250403. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.