BMW X7 2019 — technical service bulletin
Bulletin B540519 · NHTSA communication 10161566 · issued May 1, 2019
Technical service bulletin
communication type
Visibility
component
2019
model years
1
vehicle entries
Official summary
BUTYL ON ROOF AROUND REAR SUNROOF GLASS. CAUSE Exposure to normal ambient heat can cause the factory-applied sunroof butyl to expand and leak out from around the rear sunroof glass.
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.