Cadillac CT4 2020–2023 — technical service bulletin
Bulletin 22-NA-113 · NHTSA communication 10231407 · issued Jan 20, 2023
Technical service bulletin
communication type
Electrical System
component
2020–2023
model years
8
vehicle entries
Official summary
This service bulletin provides repair information to correct a customer concern of Head Up Display (HUD) Blank, Non-Responsive to Brightness, Aim, or Page Controls, DTC U0158 Set.
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.