BMW 430I 2023–2025 — technical service bulletin
Bulletin B840525 · NHTSA communication 11022119 · issued Aug 13, 2025
Technical service bulletin
communication type
Electrical System
component
2023–2025
model years
6
vehicle entries
Official summary
SITUATION After the telematics module (TCB4) has been replaced, the replacement part control unit is not accepted byISTA.
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.