Cadillac Lyriq 2023 — technical service bulletin
Bulletin 654.20 · NHTSA communication 11027909 · issued Jan 16, 2026
Technical service bulletin
communication type
Unknown OR Other
component
2023
model years
1
vehicle entries
Official 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.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.