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Service bulletin B510721

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10194300
Published by NHTSA2021-05-24
Manufacturer's numberB510721
Manufacturer's date2021-04-01
NHTSA componentSTRUCTURE:BODY:DOOR

NHTSA's summary

INCREASED EFFORT REQUIRED TO OPEN DOORS: One or more doors may require increased effort to open.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Body and frame

Vehicles listed
BMW 228I2020, 2021
BMW 330E2021
BMW 330I2019, 2020, 2021
BMW 430I2021
BMW M235I2020, 2021
BMW M32021
BMW M340I2020, 2021
BMW M42021
BMW M440I2021
BMW Z42019, 2020, 2021

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
19V7550002019-10-23. STRUCTURE:BODY:TRUNK LID

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
B0103252026-03-13. Warranty extension. 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.
B4107252026-01-23. Service bulletin. While driving on a smooth and/or unevenroad, a “cracking” sound is heard from therear wheel arch area (highlighted in orange) on either the right or left side.
B4107252025-08-24. Service bulletin. While driving on a smooth and/or uneven road, a “cracking” sound is heard from the rear wheel arch area (highlighted in orange) on either the right or left side.
B5112232025-07-28. Warranty extension. After carrying out the vehicle test, one or more of the stored faults indicate that the operation of the front bottom active air flap is obstructed or blocked.
B0108252025-05-31. Warranty extension. A vehicle listed above may arrive with a Check Control Message (CCM), and/or malfunction indicator lamp(MIL) illuminated. After carrying out the vehicle test, one or more of the stored faults indicate that the operation of the front bottomactive air flap is obstructed or blocked. Thoroughly inspect the front bottom air flap, when applicable, remove any contamination that is found caught inand between the bottom air flaps (aka “blinds”) and/or the housing.
B5130192025-05-02. Service bulletin. A groaning noise is present from the door frame of any door, most commonly when driving over rough roadsor during body flex. This situation may be worse in vehicles which are regularly waxed in th e area of the door jamb.
B0103252025-04-18. Warranty extension. 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.
B0107252025-04-18. Warranty extension. 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.
B5402252025-04-03. Service bulletin. While driving on an uneven road, a “clicking”sound is heard from the front bow/cowl panelarea of the convertible top.
B5403242025-01-23. Service bulletin. The convertible top does not open or close.