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Service bulletin B540819

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10170581
Published by NHTSA2020-01-21
Manufacturer's numberB540819
Manufacturer's date2019-12-01
NHTSA componentVISIBILITY:SUN/MOON ROOF ASSEMBLY; VISIBILITY

NHTSA's summary

SUNROOF REVERSES WHEN CLOSING: The sunroof reverses direction (anti-traps) just as the sunroof glass meets the wind deflector. The sunroof may not properly initialize as a result.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Glass, wipers and mirrors, Sunroof

Vehicles listed
BMW 330I2019, 2020
BMW 640I2018, 2019
BMW 640I2020
BMW M340I2020

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
B5415192020-01-21. Service bulletin. GROANING NOISE FROM SUNROOF: A groaning noise is present from the sunroof glass panel while driving over rough road surfaces or during body flex. The noise may also be present while the sunroof is opening into the vented position. Interference between the sunroof glass panel perimeter seal and the vehicle roof.
B5406192019-09-23. Service bulletin. SUNROOF REVERSES WHEN CLOSING FROM TILT POSITION. The sunroof may reverse (anti-trap activates) when attempting to close from the vented position. This may only occur at high temperatures despite no obstruction being present. Sensitive anti-trap parameters.
B5407182019-03-18. Service bulletin. PANORAMIC SUNROOF DOES NOT OPEN OR CLOSE. The panoramic sunroof will not open or close. The sunroof may only tilt with no other functions available. There are no faults stored for the panoramic sunroof. A software error in the Roof Function Center (FZD).
B5407182019-02-25. Service bulletin. PANORAMIC SUNROOF DOES NOT OPEN OR CLOSE. The panoramic sunroof will not open or close. The sunroof may only tilt with no other functions available. There are no faults stored for the panoramic sunroof. A software error in the Roof Function Center (FZD).