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 | 11035377 |
| Published by NHTSA | 2026-07-31 |
| Manufacturer's number | 662.20 |
| Manufacturer's date | 2026-07-08 |
| Campaign id or software version | 662.20 |
| NHTSA component | UNKNOWN OR OTHER |
| Manufacturer's system | CGM, BCM, TPIM: CGM-GTW (Communication Gateway Module), BCM (Body Control Module), TPIM (Traction Power Inverter 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 • Improved vehicle performance when driving in Reverse on slippery surfaces • Better One-Pedal Driving performance • Improved accuracy for driver display messages • This update contains a required software change to help improve the overall software update and diagnostics process
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.