# 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: 11034073
- Published by NHTSA: 2026\-06\-26
- Manufacturer's number: 662.20
- Manufacturer's date: 2026\-06\-19
- Campaign id or software version: 662.20
- NHTSA component: UNKNOWN OR OTHER
- Manufacturer's system: AMP, AOS, BCM, EBCM, ECM, TCM, TPIM: AMP \(Amplifier\), AOS \(Automatic Occupant Sensing Module\), BCM \(Body Control Module\), EBCM \(Electronic Brake Control Module\), ECM \(Engine Control Module\), TCM \(Transmission Control Module\), TPIM \(Traction Power Inverter Module\)

## NHTSA's summary

• Improvements to audio quality when using Google Assistant. • Additional protection for the health of your battery and updates to help prevent excessive battery drain and overheating. • Improvements will support successful software updates for your vehicle and allow you to access new features and fixes. • Improves traction and stability control when accelerating or on uneven terrain. • Improves braking and stopping performance on low\-traction surfaces. • Improves the performance of assisted braking features. • Improvements to emissions testing data • Improvements to shifting performance and fewer check engine light activations. • Improvements to eAWD indicator behavior • Improved starting reliability when your vehicle was turned off without being shifted to Park

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11034073-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11034073-9999.pdf)

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

## Vehicles listed

- 2026 CHEVROLET CORVETTE CONVERTIBLE
- 2026 CHEVROLET CORVETTE CONVERTIBLE E\-RAY
- 2026 CHEVROLET CORVETTE COUPE
- 2026 CHEVROLET CORVETTE COUPE E\-RAY

JSON: [/v1/bulletins/11034073](/v1/bulletins/11034073)

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