2021 BMW M340I Transmission and drivetrain Problems
- Complaints
- 3about this part
- Share
- 27%of 11 total for the year
- Median mileage
- 4,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 3 complaints about the transmission and drivetrain of the 2021 BMW M340I, 27% of the 11 complaints for this model year. Where a mileage was given, the median is 4,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Here’s a strong version that sounds frustrated but still credible and harder to dismiss: I’ve owned many vehicles over the years, and this BMW has been, without question, the most problematic car I’ve ever had. The list of issues has been absurd for a vehicle in this price range and from a brand that markets itself as a premium luxury manufacturer. …”
NHTSA complaint #11738468, filed 2026-05“The contact owns a 2021 BMW M340I. The contact stated while driving various speeds, the vehicle independently shifted from reverse(R) to drive(D) to park(P). The contact stated that while driving approximately 10 MPH and attempting to stop the vehicle, the brake pedal was depressed and went to the floorboard. The contact stated that the brake failed to operate as designed. The vehicle was towed to a dealer who diagnosed that the vacuum pump needed to be replaced. The vehicle was repaired. The contact stated that an unknown transmission repair was performed. …”
NHTSA complaint #11491782, filed 2022-11, 4,000 miles“While driving through an intersection and making a left turn, a failure of the engine water pump pulley caused the pulley to break apart. This led to damage to the coolant line and tensioner, sudden coolant loss, and the serpentine belt slipping off. The failure occurred mid-turn, causing the vehicle to skid and momentarily lose steering control. I narrowly avoided a collision with an oncoming vehicle that was stopped at a red light. The vehicle was towed to an independent repair shop, where mechanics confirmed that the water pump pulley had failed and caused the resulting damage. …”
NHTSA complaint #11656393, filed 2025-04Related service bulletins
- 10242688Aug 1, 2023?A software error may cause an unwanted pressure pulsation in the transmission during a "Remote Engine Start."
- 10239603Jun 1, 2023BMW 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…
- 10235178Mar 1, 2023BMW 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.
- 10233157Feb 1, 2023There 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…
- 10214260Feb 1, 2022When driving off from a standstill, a delayed or sluggish throttle response may be noticed sporadically.
- 10198906May 1, 2021SERVICE ACTION: PROGRAM OR REPLACE DUAL STORAGE SYSTEM BATTERY: A software error intermittently causes a continuous resetting of the microcontroller in the power management…
- 10190858Mar 1, 2021ACCESSORIES 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…
Transmission and drivetrain: other model years
Other parts of the 2021 BMW M340I
7 complaintsElectrical system
2 complaintsBrakes
1 complaintsFuel system
1 complaintsSteering
1 complaintsSuspension
1 complaints
← All problems reported for the 2021 BMW M340I
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 30, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology