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Service bulletins for the 2021 BMW M340i

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.

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

By type

By component

Only bulletins with component: Glass, wipers and mirrors are shown. Show all

Bulletins, newest first
B6112222022-12-12. Service bulletin. VISIBILITY. After opening the vehicle with the radio remote control and changing the profile, the exterior mirror settings are lost.
B6404222022-10-31. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. An interference noise (groaning noise) can be heard from within the heating and air-conditioning unit in the center of the instrument panel.
SIB5113182022-08-22. Service bulletin. VISIBILITY; ELECTRICAL SYSTEM; VISIBILITY:POWER WINDOW DEVICES AND CONTROLS. Any or all of these conditions may be present: A. The exterior rearview mirror glass is discolored or cracked B. The power windows and folding mirrors may not operate C. One or more of the following LIN bus faults are stored in the BDC (Body Domain Controller): Faulty exterior rearview mirror electronics have created a short on the LIN bus, damaging the mirror glass and causing functional errors in power window and exterior mirror operation.
B6403212021-12-20. Service bulletin. EQUIPMENT; VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. After replacing the microfilter during a previous service, the customer notices that the ventilation system airflow rate is noticeably less.
B6405212021-08-09. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:REFRIGERANT HOSES AND FITTINGS; ENGINE AND ENGINE COOLING; EQUIPMENT:APPLIANCE:AIR CONDITIONER. A rattling noise is heard in the vehicle interior when the air conditioning is activated.
B6106152021-05-24. Service bulletin. VISIBILITY:WINDSHIELD WIPER/WASHER; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. Washer Fluid Reservoir Rattles While Driving on Rough Roads: Rattling noises heard from vicinity of glove box.
B5408192021-03-15. Service bulletin. VISIBILITY. 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.
B5113182021-03-15. Service bulletin. VISIBILITY. LIN BUS FAULTS WITH EXTERIOR REARVIEW MIRROR GLASS DAMAGE: Faulty exterior rearview mirror electronics have created a short on the LIN bus, damaging the mirror glass and causing functional errors in power window and exterior mirror operation.
B5103212021-03-15. Service bulletin. VISIBILITY; STRUCTURE. TICKING NOISE FROM A-PILLAR AREA: A ticking noise is present in the A-Pillar and side mirror area when driving at speeds of approximately 40 MPH.
B6123152020-12-21. Service bulletin. VISIBILITY:WINDSHIELD WIPER/WASHER; EQUIPMENT. Low Washer Fluid Warning Light is illuminated when the Washer Fluid Tank is Full: Low Washer Fluid Warning Light is illuminated when the Washer Fluid Tank is Full.There are no faults stored in the system for the washer fluid level switch.
B5126202020-11-16. Service bulletin. VISIBILITY:GLASS, SIDE/REAR. SERVICE ACTION - CHECK REAR WINDOW: The rear window may not have been properly bonded. The rear window may not have been properly bonded to the body during production.

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