# Over\-the\-air update 654.50

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: 11027911
- Published by NHTSA: 2026\-02\-01
- Manufacturer's number: 654.50
- Manufacturer's date: 2026\-01\-16
- Campaign id or software version: 654.50
- NHTSA component: UNKNOWN OR OTHER
- Manufacturer's system: BCM, AMP, SRR: BCM \(Body Control Module\), AMP \(Amplifier\), SRR \(Short Range Radar\)

## NHTSA's summary

• Fixes for active cabin ventilation. • Fixes to help ensure proper functionality for heating and cooling features. • Improvements to night mode lights for shifting gears. • Fixes for Daytime Running Lamps turning on when set to Off. • Improvements to the performance of electric vehicle sound enhancement. • Fixes to help prevent loss of functionality for Dolby Atmos. • Fixes to ensure proper audio options display in menu. •Fixes to help ensure accurate driver display messages and alerts.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11027911-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11027911-9999.pdf)

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

## Vehicles listed

- 2026 CADILLAC LYRIQ

JSON: [/v1/bulletins/11027911](/v1/bulletins/11027911)

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