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Service bulletin B120526

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 id11031571
Published by NHTSA2026-04-27
Manufacturer's numberB120526
Manufacturer's date2026-04-10
NHTSA componentELECTRICAL SYSTEM

NHTSA's summary

A “knocking” sound from the fuel tank area can be heard in the passenger area. Occurrence information below. 1. The noise occurs when the engine is at idle 2. The noise occurs sporadically 3. The noise disappears when the fuel filler cap is opened 4. The noise also disappears when the tank ventilation valve is disconnected There is no relevant fault saved in the fault memory.

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

Electrical system

Vehicles listed
BMW 530I2024
BMW 740I2024

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

Recalls for the same vehicles and component
26V0560002026-01-30. ELECTRICAL SYSTEM:STARTER ASSEMBLY
23V7000002023-10-18. ELECTRICAL SYSTEM:ADAS:DRIVER MONITORING:CAMERA/SENSOR

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
B6305262026-09-28. Service bulletin. After programming the vehicle via ISTA/RSUto I-level …26-03-5xx, customer may reportsome of the interior ambient lighting strips(arrows) may begin to fail sporadically after adeep sleep cycle. This concern is temporary and the interiorambient lighting will be restored on its ownafter the vehicle is locked/unlocked or colorselection setting is changed.
B6115262026-08-28. Service campaign. In vehicles equipped with the Roof Function Center “FZD‑21” variant, a quiescent‑current violation mayoccur if the system fails to enter sleep mode. When this sleep error is present, a remote software upgrade(RSU) may be aborted and the FZD can become degraded. The following Check Control Messages (CCMs) may be displayed: “Energy Management — Increased Energy Consumption While Parked.” “Software Upgrade Failed — Workshop Visit Required.”
B6305262026-08-27. Service bulletin. After programming the vehicle via ISTA/RSUto I-level …26-03-5xx, some of the interiorambient lighting strips (arrows) may begin tofail sporadically after a deep sleep cycle.
B3401242026-08-27. Service campaign. After replacement of the Integrated Braking system (IB)/Power Brake the total distance covered might belower than when handed over to the workshop for the repair.
B6520262026-07-31. Service bulletin. The Central Information Display (CID) side of the Multifunction Display (MFD) may flicker intermittently. Theflickering manifests itself in three phases: The image is distorted The central information display turns black (black screen) The image is OK again The complete flickering episode with all the above-mentioned three phases only lasts about half a second intotal each time.
B6102262026-04-27. Service bulletin. In rare occasions, control of certain vehicle security functions via the Central Information Display (CID) is restricted for a short period of time.
B1203262026-03-13. Emissions. BMW AG is conducting Voluntary Emissions Recall (effective March 11, 2026) on certain Model Year 2023 -2026 BMW vehicles that were produced between January 14, 2022, and September 16, 2025.
B0607262026-02-04. Other. Wiring Harness Return
B0601262026-02-04. Other. Power Kit Electronics Return
B1211252025-11-25. Service bulletin. One or both of the following faults stored in the DME: 034AA5 - Mixture control bank 1, lambda regulation, mixture too lean 034AA8 - Mixture control bank 1, lambda adaptation, mixture too rich And additionally with the faults above, these affected vehicles may have one or more of the followingirregular combustion-related faults also stored: 033812 033813 033814 033815 033816 033817 033818 033819