# 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

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11036504-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11036504-9999.pdf)

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

## Vehicles listed

- 2025 GMC HUMMER EV PICKUP
- 2025 GMC HUMMER EV SUV

JSON: [/v1/bulletins/11036504](/v1/bulletins/11036504)

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