Cadillac Lyriq 2022–2023 — technical service bulletin
Bulletin PIT5878C · NHTSA communication 10234235 · issued Mar 23, 2023
Technical service bulletin
communication type
Engine and Engine Cooling
component
2022–2023
model years
3
vehicle entries
Official summary
This Preliminary information communicates to the field engineering contacts to assist in the diagnosis of HVAC concerns on the new 2022-2023 HUMMER EV and the 2023 LYRIQ.
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.