# 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: 11027909
- Published by NHTSA: 2026\-02\-01
- Manufacturer's number: 654.20
- Manufacturer's date: 2026\-01\-16
- Campaign id or software version: 654.20
- NHTSA component: UNKNOWN OR OTHER
- Manufacturer's system: AOS, LRR, EBCM, AMP: AOS \(Automatic Occupant Sensing Module\), LRR \(Long Range Radar\), EBCM \(Electronic Brake Control Module\), AMP \(Amplifier\)

## NHTSA's summary

• Fixes to help ensure successful vehicle software updates. • Improvements to the performance of Automatic Emergency Braking and Adaptive Cruise Control braking. • Fixes to help ensure proper functionality of Forward Collision Alert and availability of driver assistance features. • 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 proper traction control activation.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11027909-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11027909-9999.pdf)

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

## Vehicles listed

- 2023 CADILLAC LYRIQ

JSON: [/v1/bulletins/11027909](/v1/bulletins/11027909)

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