BMW 320I 2016–2017 — technical service bulletin
Bulletin B121717 · NHTSA communication 10136712 · issued Dec 1, 2017
Technical service bulletin
communication type
Electrical System
component
2016–2017
model years
4
vehicle entries
Official summary
SERVICE ACTION: INSPECT / REWORK DME CONNECTOR: Due to missing sealing pins in the unused wiring slots of DME connector A368*1B, moisture ingress could occur increasing the risk of corrosion or electrical short circuits between pins.
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.