# Over\-the\-air update 654.20

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: 11030384
- Published by NHTSA: 2026\-04\-01
- Manufacturer's number: 654.20
- Manufacturer's date: 2026\-02\-09
- Campaign id or software version: 654.20
- NHTSA component: UNKNOWN OR OTHER
- Manufacturer's system: TPIM \(Traction Power Inverter Module\), VLM \(Vehicle Leveling Module\), EBCM \(Electronic Brake Control Module\), HDLM \(High Definition Localization Module\), PTM \(Power Tailgate Module\), BCM \(Body Control Module\): TPIM \(Traction Power Inverter Module\), VLM \(Vehicle Leveling Module\), EBCM \(Electronic Brake Control Module\), HDLM \(High Definition Localization Module\), PTM \(Power Tailgate Module\), BCM \(Body Control Module\)

## NHTSA's summary

• Improvements to the performance of One\-Pedal Driving. • Improvements to leveling corrections. • Improvements to the performance of Super Cruise. • Improvements to the opening power of the rear power gate. • Fixes to address antilock braking system responsiveness.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11030384-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11030384-9999.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/11030384](/v1/bulletins/11030384)

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