BMW X7 2019–2021 — technical service bulletin
Bulletin B640221 · NHTSA communication 10188952 · issued Feb 1, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2019–2021
model years
3
vehicle entries
Official summary
CHECK CONTROL MESSAGE: A leak may occur in the coolant pipes that run underneath the vehicle floor.
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.