BMW X3 2018–2021 — technical service bulletin
Bulletin B540320 · NHTSA communication 10190856 · issued Mar 1, 2021
Technical service bulletin
communication type
Visibility
component
2018–2021
model years
16
vehicle entries
Official summary
SUNROOF NOT INITIALIZED: During operation, the sunroof may have lost initialization due to extended activation of the switch.
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.