BMW 330I 2021 — service campaign
Bulletin B110521 · NHTSA communication 11012077 · issued Dec 6, 2024
Service campaign
communication type
Engine
component
2021
model years
6
vehicle entries
Official summary
The belt pulley on the mechanical coolant pump may fracture allowing the engine drive belt to come off thecoolant pump and alternator.
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.