# 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: 11034930
- Published by NHTSA: 2026\-07\-08
- Manufacturer's number: 662.20
- Manufacturer's date: 2026\-06\-25
- Campaign id or software version: 662.20
- NHTSA component: UNKNOWN OR OTHER
- Manufacturer's system: AMP, RDCM, EBCM, BCM, AOS, LRR, SRR, PFCM, VICM, CGM, TPIM: AMP \(Amplifier\), RDCM \(Rear Driver Control Module\), EBCM \(Electronic Brake Control Module\), BCM \(Body Control Module\), AOS \(Automatic Occupant Sensing Module\), LRR \(Long Range Radar\), SRR \(Short Range Radar\), PFCM \(Power Front Closure Module\), VICM \(Vehicle Integration Control Module\), CGM\-GTW \(Communication Gateway Module\), TPIM \(Traction Power Inverter Module\)

## NHTSA's summary

• Additional protection for battery health and to help prevent battery drain • Improved charging messaging in the driver display • Improved vehicle diagnostics • Improved vehicle performance when driving in Reverse on slippery surfaces • Better One\-Pedal Driving performance • Additional protection for battery health and prevention for battery drain • Improved accuracy for driver display message

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11034930-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11034930-9999.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/11034930](/v1/bulletins/11034930)

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