2021 BMW M340I: Recalls, Problems & MPG
Here are the deets on the 2021 BMW M340I: 6 recalls, 11 owner complaints and up to 26 mpg combined.
Recalls
6 vehicle recalls from the manufacturer. Repairs are free. Check your VIN to see if one is still open on your car.
Electrical Vehicle recall #20V761000 · 2020 · 812 vehicles
What's wrong: The connection between the 48-volt battery and the starter-generator May not have been assembled properly, which can cause increased electrical resistance at the connections.
Why it matters: Increased electrical resistance can increase the risk of a fire.
The fix: Bmw will notify owners, and dealers will inspect the connection between the 48-volt battery and the starter-generator assembly, replacing it if necessary, free of charge. The recall is expected to begin April 12, 2021.
Backup camera, Backup camera Vehicle recall #21V096000 · 2021 · 13,858 vehicles
What's wrong: When shifting into reverse, a small portion of the rearview image May be obscured, or the screen May not illuminate. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (fmvss) number 111, "rear visibility."
Why it matters: 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.
The fix: Bmw will notify owners, and dealers will inspect the rearview camera software and update it if necessary, free of charge. The recall began April 16, 2021.
Seat belts Vehicle recall #21V298000 · 2021 · 12 vehicles
What's wrong: The bolt securing the seat belt assembly to the frame was not tightened to specification.
Why it matters: An improperly installed seat belt assembly May not restrain an occupant as expected, increasing the risk of injury.
The fix: Bmw will notify owners, and dealers will inspect the front seat belt buckle assembly connection and, if necessary, replace it, free of charge. Owner notification letters were mailed on June 25, 2021.
Seat belts Vehicle recall #21V554000 · 2021 · 21,537 vehicles
What's wrong: The passenger seat belt automatic locking retractor (alr) May deactivate early, before the webbing fully retracts. As such, these assemblies fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, "occupant crash protection."
Why it matters: During a crash, a seat belt retractor that does not function as intended increases the risk of injury.
The fix: Dealers will inspect the seat belt retractors (including the seat belts) and, if necessary, replace the retractors, free of charge. Owner notification letters were mailed on September 3, 2021.
Seats Vehicle recall #23V211000 · 2023 · 51 vehicles
What's wrong: The seat frame May not have been welded properly to the seat rails.
Why it matters: An improperly welded seat frame May not properly restrain the occupant during a crash, increasing the risk of injury.
The fix: Dealers will replace the seat frame and back rest, free of charge. Owner notification letters were mailed May 22, 2023.
Electrical, Seat belts Vehicle recall #23V584000 · 2023 · 144 vehicles
What's wrong: 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."
Why it matters: An audible chime that does not properly alert the driver to fasten their seat belt increases the risk of injury in a crash.
The fix: Dealers will update the receiver audio module software, free of charge. Owner notification letters were mailed October 12, 2023.
Most-reported problems
Owner complaints filed with NHTSA, by component. One complaint can list several components. 0 mention a fire, 0 injuries and 0 deaths were reported.
What owners describe
- Engine (7): no single recurring theme in the descriptions.
- Transmission & drivetrain (3): the most common themes are hard / delayed shifting (2).
- Electrical (2): the most common themes are electrical failure (2).
- Brakes (1): no single recurring theme in the descriptions.
The 2021 BMW M340I has 11 owner complaints, ranking #2 of 5 M340I model years for complaints (about average; the typical year has 14). Complaints peaked in 2026 (6 filed that year). The typical problem showed up when the car was about 5 years old, at a median of 4,000 miles. Neighboring years: 2020 (53 complaints, 10 recalls), 2022 (7 complaints, 1 recalls).
Engines & fuel economy (EPA)
| Engine | Transmission | Drive | City | Hwy | Comb. | Fuel |
|---|---|---|---|---|---|---|
| 3.0 L 6-cyl turbo hybrid | Automatic (S8) | Rear-Wheel Drive | 23 | 32 | 26 | Premium |
Want the full repair deets? Get the factory manual.
Recall and complaint data tells you what goes wrong. A service manual tells you how to fix it: torque specs, wiring diagrams, fluid capacities and step-by-step procedures for the 2021 BMW M340I.
Closest thing to the factory manual for most years. Pay once, keep it.
Most $25–$78, one-timePro-shop repair procedures, wiring diagrams and TSBs for your exact car.
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FAQ
Does the 2021 BMW M340I have any recalls?
Yes. NHTSA lists 6 vehicle recalls for the 2021 BMW M340I. Recall repairs are free at any dealer, no matter how old the car is. Check your VIN at nhtsa.gov/recalls.
What are the most common 2021 BMW M340I problems?
Owners have filed 11 complaints with NHTSA. The most-reported areas are engine (7), transmission & drivetrain (3), electrical (2).
What gas mileage does the 2021 BMW M340I get?
EPA ratings run up to 26 mpg combined (3.0 L, Automatic (S8)), across 1 engine and transmission combos.
Where can I get a 2021 BMW M340I repair manual?
eManualOnline sells downloadable manuals, Mitchell 1 DIY and ALLDATAdiy sell online access to factory repair data, and Haynes sells printed guides and online access. Pick a download if you want to keep it, or a subscription for wiring diagrams and TSBs.