# Service bulletin B640121

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: 10212524
- Published by NHTSA: 2022\-05\-31
- Manufacturer's number: B640121
- Manufacturer's date: 2022\-02\-01
- NHTSA component: ENGINE; EQUIPMENT; VISIBILITY:SUN/MOON ROOF ASSEMBLY

## NHTSA's summary

A whistling noise is present from the fresh air inlet area \(engine compartment bulkhead area\), in the right front area of the vehicle, at speeds above 40 mph. The noise is loudest when the sunroof is in the vent position.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2022/MC-10212524-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2022/MC-10212524-9999.pdf)

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

## Components

Engine, Equipment and accessories, Glass, wipers and mirrors, Sunroof

## Vehicles listed

- 2018 to 2021 BMW X3
- 2019 to 2021 BMW X4

## Other bulletins for the same vehicles and component

- [B540421](/bulletins/10244239.md), 2023-11-01, Service bulletin: VISIBILITY:SUN/MOON ROOF ASSEMBLY; STRUCTURE. This situation can result in two customer complaints: 1. Wind noise 2. Excess water entry
- [B540123](/bulletins/10242696.md), 2023-09-25, Service bulletin: STRUCTURE; VISIBILITY:SUN/MOON ROOF ASSEMBLY. ?Water leaking into the vehicle from the headliner/microphone area.
- [B540421](/bulletins/10225114.md), 2022-10-31, Service bulletin: VISIBILITY:SUN/MOON ROOF ASSEMBLY. The front sunroof glass seal has shrunk, creating a gap which can cause wind noise or excess water entry.
- [B640121](/bulletins/10211867.md), 2022-05-16, Service bulletin: STRUCTURE; VISIBILITY:SUN/MOON ROOF ASSEMBLY. A whistling noise is present from the fresh air inlet area \(engine compartment bulkhead area\), in the right front area of the vehicle, at speeds above 40 mph. The noise is loudest when the sunroof is in the vent position.
- [B541119](/bulletins/10190857.md), 2021-04-26, Service bulletin: VISIBILITY:SUN/MOON ROOF ASSEMBLY. SUNROOF WATER LEAK DIAGNOSIS: This bulletin outlines multiple known areas of possible water entry for the vehicles listed above.
- [B540320](/bulletins/10190856.md), 2021-04-26, Service bulletin: VISIBILITY:SUN/MOON ROOF ASSEMBLY. SUNROOF NOT INITIALIZED: During operation, the sunroof may have lost initialization due to extended activation of the switch.
- [B541119](/bulletins/10176376.md), 2020-06-15, Service bulletin: VISIBILITY:SUN/MOON ROOF ASSEMBLY; EQUIPMENT. SUNROOF WATER LEAK DIAGNOSIS: This bulletin outlines multiple known areas of possible water entry for the vehicles listed above. It serves only as a diagnostic resource in troubleshooting water leak complaints from the roof area. This bulletin does not include all potential areas of water entry from the sunroof. Additional diagnosis may be required for vehicles which are not affected by the scenarios outlined below. The following situations are known to be potential causes for water entry into the vehicle from the sunroof area: Incorrect adjustment of sunroof glass panels Damage to the sunroof "perimeter seal" mounted to the roof Misplaced or damaged support foam for the center drip tray Damaged side seals of the rear sunroof glass panel Improperly installed clogged or kinked panoramic sunroof drain.
- [B541119](/bulletins/10166383.md), 2019-10-21, Service bulletin: VISIBILITY:SUN/MOON ROOF ASSEMBLY; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; STRUCTURE. SUNROOF WATER LEAK DIAGNOSIS: This bulletin outlines multiple known areas of possible water entry for the vehicles listed above. It serves only as a diagnostic resource in troubleshooting water leak complaints from the roof area.
- [B540718](/bulletins/10154854.md), 2019-03-18, Service bulletin: VISIBILITY:SUN/MOON ROOF ASSEMBLY. 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 \(FZD\).
- [B540718](/bulletins/10153641.md), 2019-02-25, Service bulletin: VISIBILITY:SUN/MOON ROOF ASSEMBLY. 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 \(FZD\).

JSON: [/v1/bulletins/10212524](/v1/bulletins/10212524)

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