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: Transmission and driveline are shown. Show all
| B240323 | 2023-09-25. Service bulletin. ENGINE AND ENGINE COOLING; POWER TRAIN. ?A software error may cause an unwanted pressure pulsation in the transmission during a "Remote Engine Start." |
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| B240223 | 2023-07-24. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE. BMW AG has issued an Emissions Recall (effective March 17, 2023) on a certain Model Year 2021 - 2023 BMW vehicles that were produced between June 16, 2020, and December 13, 2022. Due to a software failure, there is the possibility that the transmission does not go into "sleep mode" if the car is turned off. |
| B240223 | 2023-05-01. Service bulletin. POWER TRAIN. BMW AG has issued a Delivery Stop: Due to a software failure, there is the possibility that the transmission does not go into "sleep mode" if the car is turned off. |
| B260422 | 2023-03-20. Service bulletin. ENGINE AND ENGINE COOLING; POWER TRAIN. There is a howling or whistling noise from under the vehicle at 30 -37 mph (50 -60 km/h) when driving after a cold start, when the outside temperature is 32 F (0 C) or lower. The noise goes away as the vehicle/driveline reaches operating temperature. |
| B340122 | 2022-06-21. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION; ENGINE. When driving off from a standstill, a delayed or sluggish throttle response may be noticed sporadically. |
| B610319 | 2021-07-06. Service bulletin. POWER TRAIN; EQUIPMENT. SERVICE ACTION: PROGRAM OR REPLACE DUAL STORAGE SYSTEM BATTERY: A software error intermittently causes a continuous resetting of the microcontroller in the power management system. This causes the red Check Control Message (CCM) "Replace Battery" to be illuminated. |
| B610120 | 2021-04-26. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. ACCESSORIES DO NOT POWER UP FROM THE FRONT 12 V POWER SOCKET PLUG: Customer is unable to power up or charge accessories through a plug adapter inserted in the front 12-volt power socket plug. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.