BMW X3 2018–2021 — technical service bulletin
Bulletin B270122 · NHTSA communication 10208177 · issued Jan 1, 2022
Technical service bulletin
communication type
Engine
component
2018–2021
model years
7
vehicle entries
Official summary
DELIVERY STOP: REPLACE CONTROL UNIT TRANSFER CASE. Due to a production failure, the control unit was assembled with a capcitator instead of a resistor.
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.