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 | 11036504 |
| Published by NHTSA | 2026-08-31 |
| 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 | RDCM, CGM, EBCM, TPIM, HDLM, PTM, VLM: RDCM (Rear Driver Control Module), CGM-GTW (Communication Gateway Module), EBCM (Electronic Brake Control Module), TPIM (Traction Power Inverter Module), HDLM (High Definition Localization Module), PTM (Power Tailgate Module), VLM (Vehicle Leveling 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
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.
| GMC HUMMER EV PICKUP | 2025 |
|---|---|
| GMC HUMMER EV SUV | 2025 |
Listing a model year does not mean every vehicle of it is concerned: the document says which.