repaired · 2025 Q3
Electrical system: software
Risk. An audible chime that does not properly alert the driver to fasten their seat belt increases the risk of injury in a crash.
2021 BMW M340iProblems, recalls & complaints
NHTSA has logged 11 owner complaints about the 2021 BMW M340i, most often about the engine. It is covered by 6 safety recalls, and for recall 23V-211 the manufacturer reports only 88% of affected cars repaired.
Source: NHTSA complaints, recalls, investigations and manufacturer recall reports, through July 2, 2026. Updated daily.
Complaints by system
Where the 2021 BMW M340i has problems
11 complaints grouped by the system owners reported.
7Engine
3Power train
2Electrical system
1Fuel/propulsion system
1Service brakes
1Steering
1Suspension
| System | Complaints | Crash, fire or injury |
|---|---|---|
| Engine | 7 | 0 |
| Power train | 3 | 0 |
| Electrical system | 2 | 0 |
| Fuel/propulsion system | 1 | 0 |
| Service brakes | 1 | 0 |
| Steering | 1 | 0 |
| Suspension | 1 | 0 |
Source: NHTSA Office of Defects Investigation. Complaints are submitted by the public and are not verified by NHTSA.
6 recalls
2021 BMW M340i recalls and how many were fixed
Each ring shows the share of affected cars repaired, from the manufacturer’s latest quarterly report to NHTSA. Recall repairs are free at authorized dealers.
repaired · 2025 Q1
Seats
Risk. An improperly welded seat frame may not properly restrain the occupant during a crash, increasing the risk of injury.
repaired · 2023 Q2
Seat belts
Risk. During a crash, a seat belt retractor that does not function as intended increases the risk of injury.
repaired · 2021 Q3
Front: buckle assembly
Risk. An improperly installed seat belt assembly may not restrain an occupant as expected, increasing the risk of injury.
Show 2 more recalls
repaired · 2023 Q1
Sensing system: camera
Risk. If the driver relies on only the rearview camera image, the missing or reduced rearview image view can increase the risk of a crash or injury.
repaired · 2022 Q4
Electrical system: 12v/24v/48v battery
Risk. Increased electrical resistance can increase the risk of a fire.
Recalls apply to specific cars. To see whether a recall is still open on yours, enter the 17-character VIN at nhtsa.gov/recalls or with BMW.
Best & worst years
2021 vs. every other M340i year
Bars show complaints per model year. Colors show the CarFlaw verdict: complaints weighted for crashes, fires and injuries, adjusted for years on the road and compared with the M340i median. How we score
'19'20'21'22'23
- Avoid
- Caution
- Solid
- Best
- Not rated
1 investigation
NHTSA defect investigations
Federal investigations that included the 2021 BMW M340i, and the recalls they led to.
- Pedestrian alert soundsLed to recall 22V-063
In owners' words
What M340i owners report
Recent engine complaints filed with NHTSA, shortened. Personal details are removed.
I have been smelling a burning odor in the vehicle for almost a year which the dealership and an independent shop had not been able to diagnose. The car was recently throwing Drivetrain Error codes which prompted a visit to the dealership. They found that the 48v battery and negative cable are…
The BMW B58TU oil pump thermoplastic component issue that can cause catastrophic failure to the engine. The the gen 1 oil pump was made from plastic and after issues were discovered, they switched to metal oil pumps. However this known issue is something that BMW has not addressed in the models…
I am reporting a safety concern involving BMW vehicles equipped with the B58 Technical Update (B58TU) engine, commonly found in model years 2019–2021. These vehicles utilize a variable-displacement engine oil pump containing an internal thermoplastic adjusting component responsible for regulating…
Own a 2021 M340i?
Decode your VIN to see the recalls for your exact car, then confirm open recalls with NHTSA.