# Over\-the\-air update 663.20

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: 11037749
- Published by NHTSA: 2026\-10\-02
- Manufacturer's number: 663.20
- Manufacturer's date: 2026\-09\-02
- Campaign id or software version: 663.20
- NHTSA component: UNKNOWN OR OTHER
- Manufacturer's system: CGM, HDLM, RDCM, IPC, BCM, EBCM, LRR, PTM, VLM, TPIM: CGM\-GTW \(Communication Gateway Module\), HDLM \(High Definition Localization Module\), RDCM \(Rear Driver Control Module\), IPC \(Instrument Panel Cluster\), BCM \(Body Control Module\), EBCM \(Electronic Brake Control Module\), LRR \(Long Range Radar\), PTM \(Power Tailgate Module\), VLM \(Vehicle Leveling Module\), TPIM \(Traction Power Inverter Module\)

## NHTSA's summary

• Improved availability and map updates for Super Cruise • 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-11037749-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11037749-9999.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/11037749](/v1/bulletins/11037749)

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