2020 BMW M340i Problems, Recalls & Reliability
Verdict
AvoidComplaint Index
100/100
#1 most-complained of 5 M340i years
Based on NHTSA complaints per model-year, not a reliability rating. Methodology
The 2020 BMW M340i ranks worst among the 5 model years covered, with a complaint index of 100 and 53 complaints, mostly engine-related (79% share). It carries 10 recalls, the most of any year in this range, though NHTSA lists no crashes, fires, or injuries tied to these complaints.
- Complaints
- 53
- Recalls
- 10
- Crashes / fires
- 0 / 0
- Injuries / deaths
- 0 / 0
- NHTSA overall rating
- Not rated
- EPA combined MPG
- 25
- 22 city / 30 hwy
Top 2020 BMW M340i problems
NHTSA owner complaints by component group. Groups with 15+ complaints have their own page.
- Engine42 (79%)
- Other9 (17%)
- Electrical System6 (11%)
- Fuel System3 (6%)
- Suspension, Wheels & Tires3 (6%)
- Transmission & Powertrain2 (4%)
- Brakes1 (2%)
What owners report
- Owners report the oil pump failing, sometimes with plastic internals wearing out and being replaced with an all-metal design in later production.
- Failed oil pumps are described as causing the engine to lose oil and coolant on the road and in some cases the vehicle spun out.
- Some owners report the electronic oil level sensor stops reading correctly along with unusually high oil pressure codes.
- Several owners describe the starter failing, sometimes after a recall service visit, with burning smells from the engine bay.
- One owner reported the starter fault led to a battery short and the car stalling in an intersection, requiring a tow.
- Multiple owners describe run-flat tire failures and blowouts, including bubbling and splitting sidewalls.
2020 BMW M340i recalls
10 NHTSA recall campaigns list this model year.
- NHTSA 24V576000Aug 1, 2024Engine105,588 vehicles
Engine and engine cooling:engine:engine control module (ecu/ECM):software
BMW of North America, LLC is recalling certain 2019-2020 X5, X7, 2020 3 Series Sedan, X6, 2020-2021 7 Series Sedan, 2020 8 Series Convertible, 8 Series Coupe, and 2020 8 Series Gran Coupe vehicles. Please see the recall report for the complete list of models. In the event the starter motor fails, repeated attempts to start the vehicle can cause the starter motor to overheat from an electrical overload.
Risk: A starter motor that overheats can ignite nearby combustible material in the engine compartment, increasing the risk of a fire.
Remedy: Dealers will update the vehicle software, free of charge. Owner notification letters were mailed September 27, 2024. Owners may contact BMW customer service at 1-800-525-7417.
- NHTSA 23V584000Aug 16, 2023Electrical System144 vehicles
Electrical system:software
BMW of North America, LLC (BMW) is recalling certain 2019-2022 330i, 330i xDrive, M340i, 2022 430i Coupe, 2021-2022 430i, M440i Convertible, and 2020-2022 228i xDrive Gran Coupe vehicles. The receiver audio module control unit software may fail to properly generate audible seat belt warnings to the driver to fasten their seat belt. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, "Occupant Crash Protection."
Risk: An audible chime that does not properly alert the driver to fasten their seat belt increases the risk of injury in a crash.
Remedy: Dealers will update the receiver audio module software, free of charge. Owner notification letters were mailed October 12, 2023. Owners may contact BMW customer service at 1-800-525-7417.
- NHTSA 23V211000Mar 29, 2023Structure & Body51 vehicles
Seats
BMW of North America, LLC (BMW) is recalling certain 2019-2021 330i, 330i xDrive, M340i xDrive, 2020-2021 X3 sDrive30i, X3 xDrive30i, X3 M40i, X3M, 2021 X3 xDrive30e, X4 xDrive30i, and X4M vehicles. The seat frame may not have been welded properly to the seat rails.
Risk: An improperly welded seat frame may not properly restrain the occupant during a crash, increasing the risk of injury.
Remedy: Dealers will replace the seat frame and back rest, free of charge. Owner notification letters were mailed May 22, 2023. Owners may contact BMW customer service at 1-800-525-7417.
2020 BMW M340i fuel economy and fuel cost
- City
- 22 MPG
- Highway
- 30 MPG
- Combined
- 25 MPG
- Annual fuel cost (EPA)
- $3,200
- 15,000 mi/yr
- Fuel
- Premium
- Current regular gas
- $4.32/gal
- national avg.
EPA figures; median across configurations of this model year. Estimate your own cost with the fuel cost calculator.
2020 compared with other M340i years
Frequently asked questions
- Is the 2020 BMW M340i reliable?
- Based on NHTSA owner complaints and recalls, the 2020 M340i ranks worst of the 5 model years with data, with a complaint index of 100 and 53 complaints, most tied to the engine.
- What is the main problem with the 2020 BMW M340i?
- The top problem area is the Engine, accounting for 42 of 53 complaints (79%), with a median mileage at failure of 52,757.5 miles for that category overall.
- Does the 2020 BMW M340i have recalls?
- Yes, NHTSA lists 10 recalls for the 2020 M340i, covering areas including Engine, Electrical System, Steering, Seat Belts, and Structure & Body. None are do-not-drive recalls.
- How does the 2020 M340i compare to other M340i years?
- The 2020 model has the highest complaint index (100) and is rated Avoid, compared to 2021 (index 75, Avoid), 2022 (index 50, Caution), and 2019/2023 (indexes 0 and 25).