# Service bulletin B520120

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: 11034458
- Published by NHTSA: 2026\-07\-03
- Manufacturer's number: B520120
- Manufacturer's date: 2026\-06\-27
- NHTSA component: SEATS

## NHTSA's summary

When getting in or out of the vehicle, a groaning noise can be heard from the opening \(aperture\) in the seat backrest. The noise may be heard from one or both of the front seats.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11034458-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11034458-9999.pdf)

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

## Components

Seats

## Vehicles listed

- 2024 BMW 230I
- 2024 BMW X2
- 2024 BMW Z4 M40I

## Other bulletins for the same vehicles and component

- [B521225](/bulletins/11023249.md), 2025-09-22, Service bulletin: SEATS. A clicking noise can be heard from one or both front seat backrests. This noise is heard when leaning against the backrest of the seat or while the vehicle is cornering.
- [B520425](/bulletins/11015841.md), 2025-03-21, Service bulletin: SEATS. Customer states he/she sees a check control message for the rear seat not being locked. The following fault codes stored in the air bag ACSM6 control module: 930C19 \- Backrest Sensor right 2nd seat row: open circuit 930D76 \- Function rear restraint system restricted

JSON: [/v1/bulletins/11034458](/v1/bulletins/11034458)

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