Cadillac Lyriq 2027 — technical service bulletin
Bulletin PIC6663 · NHTSA communication 11037457 · issued Sep 18, 2026
Technical service bulletin
communication type
Unknown / Other
component
2027
model years
5
vehicle entries
Official summary
This PI communicates the possibility of a B1599 setting and directs to contact TCSC.
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.