Cadillac Lyriq 2024–2025 — technical service bulletin
Bulletin PIT6352 · NHTSA communication 11015646 · issued Mar 12, 2025
Technical service bulletin
communication type
Unknown OR Other
component
2024–2025
model years
6
vehicle entries
Official summary
This Preliminary information communicates A vehicle may come to the dealer with a service high voltage message and P29BB. The dealer is advised not to replace the heater. They are to clear the code and advise the customer that engineering is working on a design improvement.
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.