BMW 428I 2014–2020 — technical service bulletin
Bulletin B513316 · NHTSA communication 10200233 · issued Jun 1, 2021
Technical service bulletin
communication type
Structure
component
2014–2020
model years
22
vehicle entries
Official summary
Water sloshing noises coming from the rear passenger compartment (left or right) while driving Water ingress in the luggage compartment, or in the rear passenger compartment- rear seat bench rear passenger compartment foot well rear passenger compartment side panel Failure of various control units installed in the area of the water removal channel
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.