# 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: 11034939
- Published by NHTSA: 2026\-07\-08
- Manufacturer's number: 662.20
- Manufacturer's date: 2026\-06\-22
- Campaign id or software version: 662.20
- NHTSA component: UNKNOWN OR OTHER
- Manufacturer's system: BCM, PTM, HDLM, SRR, EBCM: BCM \(Body Control Module\), PTM \(Power Tailgate Module\), HDLM \(High Definition Localization Module\), SRR \(Short Range Radar\), EBCM \(Electronic Brake Control Module\)

## NHTSA's summary

• The active cabin ventilation feature will operate more reliably • Additional protection for the health of your battery and updates to help prevent excessive battery drain and overheating • Improvements will support successful software updates for your vehicle and allow you to access new features and fixes

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11034939-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11034939-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Vehicles listed

- 2024 GMC HUMMER EV PICKUP
- 2024 GMC HUMMER EV SUV

JSON: [/v1/bulletins/11034939](/v1/bulletins/11034939)

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