Cadillac Lyriq 2024–2025 — technical service bulletin
Bulletin 654.40 · NHTSA communication 11027907 · issued Jan 16, 2026
Technical service bulletin
communication type
Unknown / Other
component
2024–2025
model years
2
vehicle entries
Official summary
•Improvements to help protect battery health in low temperatures. •Improvements to diagnostics to reduce service messages. •Fixes to help protect battery health in high temperatures. •Fixes to improve responsiveness for vehicle diagnostics.
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.