# Over\-the\-air update 661.40

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: 11031767
- Published by NHTSA: 2026\-04\-30
- Manufacturer's number: 661.40
- Manufacturer's date: 2026\-04\-01
- Campaign id or software version: 661.40
- NHTSA component: UNKNOWN OR OTHER
- Manufacturer's system: ACP3: "ACP3\_MCU \(ADAS Compute Platform 3 \- Microprocessor Control Unit\), ACP3\_SOC \(ADAS Compute Platform 3 \- System On A Chip\)

## NHTSA's summary

• Improvements to the performance of Brake Assist. • Fixes to help ensure proper Super Cruise lane change functionality.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11031767-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11031767-9999.pdf)

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

## Vehicles listed

- 2026 GMC HUMMER EV PICKUP
- 2026 GMC HUMMER EV SUV

JSON: [/v1/bulletins/11031767](/v1/bulletins/11031767)

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