BMW 230I 2016–2018 — technical service bulletin
Bulletin B120418 · NHTSA communication 10135024 · issued Feb 1, 2018
Technical service bulletin
communication type
Engine and Engine Cooling
component
2016–2018
model years
8
vehicle entries
Official summary
BUZZING NOISE FROM VALVETRONIC MOTOR BEFORE: Buzzing noise may be heard from the Valvetronic motor when the vehicle is unlocked, before the engine is started, or after the engine is turned off.
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.