# Over\-the\-air update 653.20

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: 11025933
- Published by NHTSA: 2025\-12\-02
- Manufacturer's number: 653.20
- Manufacturer's date: 2025\-11\-18
- Campaign id or software version: 653.20
- NHTSA component: UNKNOWN OR OTHER
- Manufacturer's system: VICM: VICM \(Vehicle Integration Control Module\)

## NHTSA's summary

This software update includes the following, if your vehicle is equipped: • Improvements to battery health diagnostics. • Fixes for efficiency when using fast charging stations. • Improvements to reliability for climate control and charging. • Improvements to the accuracy of efficiency values. • Improvements to shifting. • Fixes to protect battery health and adjust charge limits. During the update process, your radio may stay on up to 5 minutes after you exit the vehicle. This is expected behavior when an update package is onboard the vehicle. Do not service your vehicle during installation.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11025933-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11025933-9999.pdf)

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

## Vehicles listed

- 2024 to 2026 CHEVROLET BLAZER EV

JSON: [/v1/bulletins/11025933](/v1/bulletins/11025933)

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