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Service bulletin B521723

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 id10249023
Published by NHTSA2024-02-01
Manufacturer's numberB521723
Manufacturer's date2024-01-02
NHTSA componentELECTRICAL SYSTEM; SEATS

NHTSA's summary

Customer states one of the front seats is inoperative. The seat heater and power supply are inoperative. During the vehicle test, the seat module does not respond. The power supply fuse for the seat module isfound to have blown.

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, Seats

Vehicles listed
BMW 3 SERIES2023
BMW 3 SERIES2023
BMW 3 SERIES2023
BMW 3 SERIES2023
BMW 330E2020
BMW 330E2021, 2022, 2023, 2024
BMW 330I2019, 2020, 2021, 2022, 2023, 2024
BMW 340I2019
BMW 340I2020
BMW 340I2023
BMW 4 SERIES2023
BMW 430I2020, 2021, 2022, 2023, 2024
BMW 440I2020
BMW 8 SERIES2023
BMW 840I2020, 2021, 2022, 2023, 2024
BMW 850I2023
BMW M42021, 2022, 2023, 2024
BMW M4 GT42023
BMW M440I2021, 2022, 2023, 2024
BMW X12017, 2018, 2019, 2020, 2021, 2022
BMW X1 SAV2017

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
25V6440002025-09-25. ELECTRICAL SYSTEM:STARTER ASSEMBLY
20254992025-09-23. Electrical
25V6360002025-09-23. ELECTRICAL SYSTEM:STARTER ASSEMBLY:RELAY
20244442024-08-01. Electrical
24V5760002024-08-01. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE; ELECTRICAL SYSTEM:STARTER ASSEMBLY
23V5840002023-08-16. ELECTRICAL SYSTEM:SOFTWARE; SEAT BELTS
23V2110002023-03-29. SEATS
20230932023-02-24. Electrical
23V1180002023-02-23. ELECTRICAL SYSTEM:BODY CONTROL MODULE:SOFTWARE

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
B1104262026-08-03. Service bulletin. The manual starting of electronic engine oil level measurement from inside the vehicle, usually afterperforming an engine oil service task, is inoperative or it may lock up at between a 15% to 30% completionrate.
B8402262026-07-31. Service campaign. Once the Telematics Module (TCB2) enters sleep mode, a BMW Data Services trigger for Remote Services(remote engine start, lock/unlock/climate conditioning) will not be able to reactivate the TCB2. Due to this issue, Remote Services will not function in the vehicle when parked and locked.
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.
B6520252026-05-18. Service bulletin. After replacing the Multifunctional Display (MFD), the Central Information Display (CID) is black. The backlight of the CID is illuminated, and touch function does register an audible sound.
B0620262026-02-25. Other. KLE Control Unit Return
B6413252026-01-05. Service bulletin. When performing a vehicle test, diagnostic trouble code “ 8013FE Software run time error” is found in theIHKA module. If this fault is set for two consecutive life cycles, it will turn on the check engine light on vehicles with an I-level lower than 24-11-570. This fault memory entry does not cause an impairment of functionality of the automatic air conditioningsystem.
B8406252025-10-09. Service bulletin. In some situations, an emergency call may be triggered in the vehicle without either the customer pressing the SOS Call button, or an airbag deployment event. In some cases, the customer may not even be inside the vehicle.
B8405252025-08-24. Service bulletin. SITUATION After the telematics module (TCB4) has been replaced, the replacement part control unit is not accepted byISTA.
B5211252025-08-24. Service bulletin. If the seat ventilation is deactivated via the switch or due to parking the vehicle, the fans in the seat cushionor under the seat cushion surface are unpleasantly loud. The fans speed up loudly twice and then turn off. The functionality of the fans is not impaired. This behavior only occurs after the vehicle had been programmed to I level S18A- 25-07-520 and higher; upto, but not including S18A- 25-07-551.
B6518252025-08-13. Service bulletin. When the alarm system is activated and doors are locked, within a short period the doors will unlock, and a “double beep” acoustic confirmation is heard from vehicle.