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 | 11031827 |
| Published by NHTSA | 2026-05-01 |
| Manufacturer's number | 661.21 |
| Manufacturer's date | 2026-04-28 |
| Campaign id or software version | 661.21 |
| NHTSA component | UNKNOWN OR OTHER |
| Manufacturer's system | TCP: TCP (Telematics Communication Platform) |
NHTSA's summary
• Improvements to the performance of vehicle software updates. • Fixes to help prevent loss of functionality for connectivity features, including maps and Wi-Fi. • Fixes to help prevent erroneous emergency calls from vehicle. • Fixes for deleting digital keys. • Fixes to help ensure proper functionality for mobile app features. • Improvements to the performance of Super Cruise.
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 ESCALADE | 2025 |
|---|---|
| CADILLAC ESCALADE ESV | 2025 |
| CHEVROLET SUBURBAN 1500 | 2025 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET TAHOE | 2025 |
| GMC YUKON | 2025 |
| GMC YUKON XL | 2025 |
Listing a model year does not mean every vehicle of it is concerned: the document says which.