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Service bulletin B120721

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 id10245367
Published by NHTSA2023-12-06
Manufacturer's numberB120721
Manufacturer's date2023-11-09
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

Check Control message (CCM) indicates: (ID 213): Stop, exercising due care. Voltage supply The Service Engine Soon light is on with the following DME Fault Code: 21B209 - Starter alternator / belt for 48V system (OSA_RIEMEN_RISS): Belt betweenCombustion engine and starter generator torn And/or one or more of the following other issues are also occurring: Noise in the area of the belt drive. Odor from the engine compartment. Smoke formation in the area of the belt drive. Drive belt damaged or prematurely worn. Torn drive belt.

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

Engine

Vehicles listed
BMW 3 SERIES2023
BMW 3 SERIES2023
BMW 3 SERIES2023
BMW 3 SERIES2023
BMW 320I2018
BMW 328D2018
BMW 330E2018
BMW 330E2020
BMW 330E2021, 2022, 2023, 2024
BMW 330I2018, 2019, 2020, 2021, 2022, 2023, 2024
BMW 340I2018, 2019
BMW 340I2020
BMW 340I2023
BMW 4 SERIES2023
BMW 430I2021, 2022, 2023, 2024
BMW 5 SERIES2023
BMW 5-SERIES GRAN TURISMO2017
BMW 530E2017
BMW 530E2018, 2019, 2020, 2021, 2022, 2023
BMW 530I2017, 2018, 2019, 2020, 2021, 2022, 2023
BMW 535I2017
BMW 540D2018, 2019
BMW 540D2020
BMW 540D2022 to 2023
BMW 540I2017, 2018, 2019, 2020, 2021, 2022, 2023
BMW 550E2020 to 2021
BMW 550I2017
BMW 640I2017, 2018, 2019
BMW 640I2020
BMW X52019, 2020, 2021, 2022, 2023, 2024
BMW X5 HYBRID2021 to 2022
BMW X62020, 2021, 2022, 2023, 2024
BMW X6 M2020
BMW X72019, 2020, 2021, 2022, 2023, 2024

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

Recalls for the same vehicles and component
20263312026-07-08. Engine
20260402026-01-30. Engine
20255602025-10-15. Engine
25V7000002025-10-15. FUEL SYSTEM, DIESEL; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM
20255142025-09-25. Engine
24V5880002024-08-08. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:GAS RECIRCULATION VALVE (EGR VALVE)
24V5760002024-08-01. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE; ELECTRICAL SYSTEM:STARTER ASSEMBLY
23V8630002023-12-20. ENGINE
23V2940002023-04-26. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR
22V6140002022-08-10. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:GAS RECIRCULATION VALVE (EGR VALVE)

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
B1211262026-09-28. Service bulletin. Potential customer complaints with no fault codes stored / No MIL displayed. 1. “Rough idle after idling for a longer period of time” 2. “Vehicle feels like it is misfiring at idle” The automatic Start/Stop function is deactivated. The vehicle is stopped and the engine runs at idle speed. After prolonged idle operation (approximately 30 to 50 seconds), a slight jolt or slight change in idlespeed may be noticeable. There are no relevant errors in the DME fault code memory. No mixture control error, no misfiring, no error relating to a relevant component of the drive system. Motor vehicles affected: 1. Only MHEVs (mild hybrid electric vehicle) with crankshaft-driven starter generator. 2. Only vehicles with optional equipment 01CE = recuperation system 3. Affected I-levels: I-level 24-07-500 or higher
B0644262026-08-28. Other. Air Flap Return
B0641262026-08-28. Other. Fan Return
B1107232026-08-26. Emissions. The return springs on the exhaust camshaft followers (switchable rocker arm) may break.
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.
B0115242026-08-03. Warranty extension. The NVLD modules limited warranty for defects in materials and/or workmanship has been extended to 15 years / 150,000 miles as determined from the vehicles original in-service / first delivery date.
B0109212026-08-03. Warranty extension. The NVLD limited emissionrelated warranty for defects in materials or workmanship has been extended to 15 years/150,000 miles as determined from the original in-service date.
B0103242026-08-03. Warranty extension. The EVAP systems purge (vent) valve 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.
B0102242026-08-03. Warranty extension. The EVAP systems purge (vent) valve 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.
B1203262026-07-31. Emissions. Due to an implementation error in various OBD diagnostics in the vehicle's control units, in very rare cases itmay happen that stored fault memory codes (DTCs) and the MIL (warning light) are not automaticallydeleted even though the underlying malfunction has already been rectified. This does not comply with the statutory OBD specifications.