Cadillac bulletin 661.20
Cadillac filed this with NHTSA as a over-the-air update dated Jul 24, 2026, received Apr 2, 2026, about the unknown or other — 9 documents under this number. It names 10 model years (2024–2026). A over-the-air update is not a safety recall — there is no NHTSA campaign number and no federal requirement — but it is usually work the manufacturer pays for on the vehicles it names; the dealer checks the VIN against the manufacturer’s list.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communication• Improvements to interior audio quality and volume consistency. • Improves traction and stability control when accelerating or on uneven terrain. • Improves braking and stopping performance on low-traction surfaces. • Fixes for active cabin ventilation. • Fixes to help ensure proper functionality for heating and cooling features. • Improvements to night mode lights for shifting gears. • Fixes for Daytime Running Lamps turning on when set to Off. • Fixes for speed threshold for pedestrian alerts. • Improvements to the performance of Automatic Emergency Braking and Adaptive Cruise Control braking. • Fixes to help ensure proper functionality of Forward Collision Alert and availability of driver assistance features. • Fixes to help protect battery life. • Improvements to provide more accurate speed limit detection on the driver’s display. • Fixes to help ensure driver assistance features remain functional when the windshield freezes. • Fixes to help ensure accurate driver display messages and alerts.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 661.20 | Over-the-air update | Jul 24, 2026 | 11035347 | PDF, 196 KB |
| 661.20 | Over-the-air update | Jun 18, 2026 | 11034066 | PDF, 192 KB |
| 661.20 | Over-the-air update | Jun 8, 2026 | 11034048 | PDF, 194 KB |
| 661.20 | Over-the-air update | May 30, 2026 | 11033005 | not yet checked |
| 661.20 | Over-the-air update | May 1, 2026 | 11031828 | not yet checked |
| 661.20 | Over-the-air update | Apr 28, 2026 | 11031821 | not yet checked |
| 661.20 | Over-the-air update | Apr 22, 2026 | 11031816 | not yet checked |
| 661.20 | Over-the-air update | Apr 21, 2026 | 11031774 | not yet checked |
| 661.20 | Over-the-air update | Mar 27, 2026 | 11030524 | not yet checked |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
Common questions
Source: NHTSA, 49 CFR 579.5Is Cadillac 661.20 a recall?
No. A over-the-air update is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the 661.20 repair free?
A over-the-air update is usually paid by the manufacturer on the vehicles it names, within the terms and time limit the document sets; the dealer checks the VIN against the manufacturer’s list.
Which vehicles does 661.20 cover?
The manufacturer filed it against 10 model years: 2025 Cadillac CT4, 2025 Cadillac CT5, 2026 Cadillac Celestiq, 2026 Cadillac Escalade, 2024 Cadillac Escalade, 2026 Cadillac Lyriq and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.