Over-the-air update 661.20
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 | 11030538 |
| Published by NHTSA | 2026-04-02 |
| Manufacturer's number | 661.20 |
| Manufacturer's date | 2026-03-21 |
| Campaign id or software version | 661.20 |
| NHTSA component | UNKNOWN OR OTHER |
| Manufacturer's system | ACP: ACP (ADAS Compute Platform) |
NHTSA's summary
• Improvements to accuracy of Park Assist messaging. • Fixes to improve performance of driver assistance systems and rear view camera. • Improvements to responsiveness of rear view camera. • Fixes to address Super Cruise disengaging erroneously.
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.
| CHEVROLET SILVERADO EV | 2026 (the catalog's model; the bulletin names a series or trim of it) |
|---|---|
| GMC SIERRA EV | 2026 (the catalog's model; the bulletin names a series or trim of it) |
Listing a model year does not mean every vehicle of it is concerned: the document says which.