# Service bulletin B540122

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.

- Type: Service bulletin
- NHTSA id: 10211863
- Published by NHTSA: 2022\-05\-16
- Manufacturer's number: B540122
- Manufacturer's date: 2022\-03\-01
- NHTSA component: VISIBILITY:SUN/MOON ROOF ASSEMBLY

## NHTSA's summary

When locking the vehicle using the remote, the rear roof sunblind closes. It will re\-open when unlocking the vehicle.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2022/MC-10211863-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2022/MC-10211863-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Glass, wipers and mirrors, Sunroof

## Vehicles listed

- 2020 to 2022 BMW 840I
- 2022 BMW M8
- 2020 BMW M8 GRAN COUPE
- 2020 to 2021 BMW M850I

## Other bulletins for the same vehicles and component

- [B540521](/bulletins/10242698.md), 2023-09-25, Service bulletin: STRUCTURE:BODY:ROOF AND PILLARS; VISIBILITY:SUN/MOON ROOF ASSEMBLY. ?The sunroof will not operate in either direction.

JSON: [/v1/bulletins/10211863](/v1/bulletins/10211863)

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