Cadillac CT4 2020–2026 — technical service bulletin
Bulletin PIC6555A · NHTSA communication 11037319 · issued Sep 8, 2026
Technical service bulletin
communication type
Unknown / Other
component
2020–2026
model years
14
vehicle entries
Official summary
This PI advises of a procedure for a Service Door Latch System message with No Related DTCs
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.