Over-the-air update 661.21
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
| Type | Over-the-air update |
|---|---|
| NHTSA id | 11031923 |
| Published by NHTSA | 2026-05-01 |
| Manufacturer's number | 661.21 |
| Manufacturer's date | 2026-05-01 |
| Campaign id or software version | 661.21 |
| NHTSA component | UNKNOWN OR OTHER |
| Manufacturer's system | ACP: "ACP3_SO(ADAS Compute Platform 3 - System On A Chip), ACP3_MCU (ADAS Compute Platform 3 - Microprocessor Control Unit) |
NHTSA's summary
• Improvements to Super Cruise disengagement alerts. • Improvements to the availability of Super Cruise. • Improvements to driver attention monitoring to help reduce unnecessary OnStar escalation calls. • Improvements to Super Cruise lane merging performance. • Improvements to the responsiveness of rear view camera display.
The document
The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.
| CADILLAC CELESTIQ | 2025 |
|---|
Listing a model year does not mean every vehicle of it is concerned: the document says which.