TSB 661.30 — Cadillac, Chevrolet and GMC Software update
661.30 is a software update on file with NHTSA for 9 Cadillac, Chevrolet and GMC models, 2023–2027 model years, filed and re-filed as 7 documents. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. • Improvements to active cabin ventilation • Additional protection for the health of your battery • Updates to help prevent excessive battery drain and overheating • Improvements to the software update system • Fixes to Forward Collision Alert and driver assistance features •…
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Worth checking your VIN against. 661.30 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 661.30 names
Every document filed under 661.30
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 |
|---|---|---|
| 661.30 | June 18, 2026 | Software update |
| 661.30 | May 26, 2026 | Software update |
| 661.30 | May 22, 2026 | Software update |
| 661.30 | May 7, 2026 | Software update |
| 661.30 | May 1, 2026 | Software update |
| 661.30 | April 23, 2026 | Software update |
| 661.30 | April 14, 2026 | Software update |
Questions buyers ask
What is TSB 661.30?
661.30 is a software update filed with NHTSA by Cadillac, Chevrolet and GMC, covering 9 Cadillac, Chevrolet and GMC models across the 2023–2027 model years. NHTSA's summary reads: • Improvements to active cabin ventilation • Additional protection for the health of your battery • Updates to help prevent excessive battery drain and overheating • Improvements to the software update system • Fixes to Forward Collision Alert and driver assistance features •…
Which vehicles does 661.30 cover?
NHTSA's file names Cadillac Escalade (2025–2026); Chevrolet Bolt EV (2027); Chevrolet Equinox (2025–2026); Chevrolet Silverado 1500 (2023); Chevrolet Suburban (2025–2026); Chevrolet Tahoe (2025–2026); GMC Sierra 1500 (2023); GMC Terrain (2025–2026); GMC Yukon (2025–2026). 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 661.30 a recall, and is the repair free?
661.30 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 661.30?
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 661.30, 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 661.30. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.