Cadillac Lyriq 2023–2026 — technical service bulletin
Bulletin PIC6642A · NHTSA communication 11028860 · issued Feb 13, 2026
Technical service bulletin
communication type
Unknown OR Other
component
2023–2026
model years
4
vehicle entries
Official summary
This PI communicates a possible concern with the customer experiencing a service headlamp message on startup and DTC's B1B5F SYM49 and/or B1B60 SYM49 maybe found current or history.
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.