BMW 330I 2023–2024 — technical service bulletin
Bulletin B640125 · NHTSA communication 11014665 · issued Feb 28, 2025
Technical service bulletin
communication type
Unknown / Other
component
2023–2024
model years
4
vehicle entries
Official summary
The customer may hear an intermittent “humming” or “foghorn” type sound in vehicle. It sounds like a lowhum that last for only a few seconds. This can occur with the engine operating or may be heard for up to one hour after engine shut down.
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.