Over-the-air update 662.20
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 | 11035390 |
| Published by NHTSA | 2026-07-31 |
| Manufacturer's number | 662.20 |
| Manufacturer's date | 2026-07-16 |
| Campaign id or software version | 662.20 |
| NHTSA component | UNKNOWN OR OTHER |
| Manufacturer's system | CGM, BCM: CGM-GTW (Communication Gateway Module), BCM (Body Control Module) |
NHTSA's summary
• 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 • This update contains a required software change to help improve the overall software update and diagnostics process Be sure to install this update to be able to receive future software updates.
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 | 2025 (the catalog's model; the bulletin names a series or trim of it) |
|---|---|
| GMC SIERRA EV | 2025 (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.