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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: Body and frame are shown. Show all

Bulletins, newest first
B0103252025-04-18. Warranty extension. STRUCTURE:BODY. The Radiator Grilles Lower Active Air Flap Assembly limited warranty for defects in materials and/or workmanship has been extended to 15 years / 150,000 miles as determined from the original first in-service / delivery date.
B5146162023-06-26. Service bulletin. STRUCTURE:BODY:TAILGATE. Upon opening and closing the tailgate, a creaking/groaning sound can be heard from tailgate actuator.
B2402222023-01-30. Service bulletin. STRUCTURE. A cracking, metallic noise from under the center of the vehicle.
SIB5108222022-08-22. Service bulletin. STRUCTURE. Whistling noise is heard coming from the front bumper while driving at highway speeds.
B6405212022-05-31. Service bulletin. STRUCTURE. A rattling noise is heard in the vehicle interior when the air conditioning (AC) is activated.
B6122192022-01-24. Service bulletin. EQUIPMENT:ELECTRICAL; STRUCTURE:BODY:DOOR. The customer states that the vehicle locks itself when the last door was closed, even though the remote control/display key was inside the vehicle.
B6508212021-08-09. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; STRUCTURE:INTERIOR PANELS:DASHBOARD; EQUIPMENT. Customer states the Central Information Display is flickering and the picture is shifting.
B6403212021-08-09. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; STRUCTURE:INTERIOR PANELS:DASHBOARD. After replacing the microfilter during a previous service, the customer notices that the ventilation system airflow rate is noticeably less. This leads to perceived lower cooling power. The customer may also notice that external odors enter the vehicle.
B4102212021-08-09. Service bulletin. STRUCTURE:BODY:DOOR. BMW AG has issued a Delivery Stop (effective June 2, 2021) on certain Model Year 2021 BMW 3 Series vehicles that were produced between May 5, 2021 and May 26, 2021. Most of the affected vehicles will be repaired at the VDCs and only a few have been delivered to dealers.
B5107212021-05-24. Service bulletin. STRUCTURE:BODY:DOOR. INCREASED EFFORT REQUIRED TO OPEN DOORS: One or more doors may require increased effort to open.
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.
B6101212021-02-22. Service bulletin. STRUCTURE:BODY:HOOD; ELECTRICAL SYSTEM:12V/24V/48V BATTERY. BATTERY DOES NOT CHARGE WITH EXTERNAL CHARGER AND CLOSED HOOD: After the vehicle has been charged using a 12 V charger with the hood closed during a long stationary period, the 48 V battery may be totally discharged, and possible replacement is needed.
B6111202021-02-01. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; STRUCTURE:BODY:DOOR; EQUIPMENT ADAPTIVE/MOBILITY. WHEN LOCKING VEHICLE, DOORS ARE LOCKED BUT VEHICLE IS NOT SECURED: The customer complains that when locking the vehicle from the outside using the remote control: The doors lock The alarm system is not activated The side mirrors (when the function is activated) do not fold in.
B5408192020-12-21. Service bulletin. STRUCTURE:BODY:ROOF AND PILLARS; ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT. 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.
B5402202020-12-21. Service bulletin. STRUCTURE:BODY:ROOF AND PILLARS; EQUIPMENT. SUNROOF ROLLER SUNBLIND INOPERATIVE: The sunroof roller sunblind may not operate correctly. The roller sunblind cannot be opened from a fully closed position. The roller sunblind cannot be closed via one touch automatic function.
B5127202020-12-21. Service bulletin. FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY:FILLER PIPE AND CAP; STRUCTURE:BODY. FUEL FILLER DOOR WILL NOT OPEN: The fuel filler door (aka flap) will not open. In rare cases, if the vehicle is locked using the remote control key and the fuel filler door is pushed closed simultaneously, the fuel door can enter a locked state that cannot be unlocked.
B5126202020-11-23. Service bulletin. STRUCTURE. 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.
B5125202020-11-23. Service bulletin. STRUCTURE. WHISTLE NOISE FROM FRONT DOORS WHILE DRIVING: There is a whistling noise present from either front door while driving at speeds of 60 mph. This can occur on one or both front doors. Foam acoustic seals at the A-Pillar and B-Pillar may have shrunk or shifted, causing an air leak.
B5125202020-11-16. Service bulletin. STRUCTURE:BODY:DOOR. WHISTLE NOISE FROM FRONT DOORS WHILE DRIVING: There is a whistling noise present from either front door while driving at speeds of 60 mph. This can occur on one or both front doors. Foam acoustic seals at the A-Pillar and B-Pillar may have shrunk or shifted, causing an air leak.
B5112192020-10-19. Service bulletin. STRUCTURE. KIDNEY GRILL ACTIVE AIR FLAP FAULTS: A check control message or MIL (Malfunction Indicator Lamp) may be illuminated.

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