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Service bulletins for the 2021 BMW X4

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.

168 on file from NHTSA, as of 2026-10-19.

By type

By component

Only bulletins with component: Sunroof are shown. Show all

Bulletins, newest first
B5404212023-11-01. Service bulletin. VISIBILITY:SUN/MOON ROOF ASSEMBLY; STRUCTURE. This situation can result in two customer complaints: 1. Wind noise 2. Excess water entry
B5401232023-09-25. Service bulletin. STRUCTURE; VISIBILITY:SUN/MOON ROOF ASSEMBLY. ?Water leaking into the vehicle from the headliner/microphone area.
B5404212022-10-31. 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.
B6401212022-05-31. Service bulletin. ENGINE; EQUIPMENT; 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.
B6401212022-05-16. 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.
B5411192021-04-26. 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.
B5403202021-04-26. 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.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.