2020 Bmw M340i problems, complaints & recalls
Most-reported problem areas: Engine (35) · Engine And Engine Cooling (3) · Tires (2)
🧭 Reliability snapshot
Compared against other Bmw M340i model years — complaint volume vs the model's median year, recalls and severity. How we score →
Safety recalls (10)
Engine And Engine Cooling:engine:engine Control Module (Ecu/Ecm):software 2024-08-01 · campaign 24V576000 · 105,588 vehicles
Defect: 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.
Fix: 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.
Electrical System:software 2023-08-16 · campaign 23V584000 · 144 vehicles
Defect: 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.
Fix: 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.
Seats 2023-03-29 · campaign 23V211000 · 51 vehicles
Defect: 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.
Fix: 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.
Engine 2021-08-02 · campaign 21V598000 · 50,024 vehicles
Defect: BMW of North America, LLC (BMW) is recalling certain 2020 M340i, M340i xDrive, 540i, 540i xDrive, X3 M40i, 2020-2021 X4 M40i, 745Le xDrive, 2019-2021 Z4 M40i, and 2020-2021 Toyota Supra vehicles. During engine start, the engine management software may cause loss of braking assist. Full mechanical braking (without assist) remains available.
Risk: Loss of braking assist can increase the risk of a crash.
Fix: Dealers will update the engine management software, free of charge. Owner notification letters were mailed on September 17, 2021. Owners may contact BMW customer service at 1-800-525-7417.
Back Over Prevention:software 2021-02-19 · campaign 21V096000 · 13,858 vehicles
Defect: BMW of North America, LLC (BMW) is recalling certain 2019-2021 X3 sDrive30i, X3 xDrive30i, X3 M40i, X3M, X4 xDrive30i, X4 M40i, M550i, X4M, X5 sDrive40i, X5 xDrive40i, X5 xDrive50i, X5M, X5 M50i, X7 xDrive40i, X7 xDrive50i, X7 M50i, Alpina XB7, 330i, 330i xDrive, M340i, M340i xDrive, and 8 Series Coupe, Convertible and Grand Coupe, 840i, 840i xDrive, M850i xDrive, M8, 2020-2021 530e, 530e xDrive, 330e, 330e xDrive, 745Le, 745Le xDrive, X5 xDrive45e, X3 xDrive30e, X6 sDrive40i, X6 xDrive40i, X6 x
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.
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. Owners may contact BMW customer service at 1-800-525-7417.
Steering:linkages:tie Rod Assembly 2020-06-15 · campaign 20V355000 · 2,779 vehicles
Defect: BMW of North America, LLC (BMW) is recalling certain 2019 Z4 sDrive30i, 2019-2020 330i xDrive, M340i and M340i xDrive, 2020 X3M and X4M, and Toyota Supra vehicles. In certain driving conditions, such as high temperatures and rough road surfaces, a steering gear tie rod may become damaged, possibly resulting in a fractured tie rod.
Risk: A damaged or fractured tie rod may affect vehicle handling and control, increasing the risk of a crash.
Fix: BMW and Toyota will notify owners, and dealers will replace the steering gear tie rods, free of charge. The recall began August 14, 2020. Owners may contact BMW customer service at 1-800-525-7417 or Toyota customer service at 1-888-270-9371.
Seat Belts:pretensioner 2020-03-19 · campaign 20V164000 · 3,316 vehicles
Defect: BMW of North America, LLC (BMW) is recalling certain 2020 X3 xDrive30e, X4 xDrive30i, X4 M40i, X4M, 330i, 330i xDrive, M340i, 840i Gran Coupe, 840i xDrive Gran Coupe, M850i xDrive Gran Coupe, M8 Gran Coupe, X3 sDrive30i, X3 xDrive30i, X3 M40i, X3M, and 840i xDrive Convertible vehicles. The sensors in the front seat belt buckles may inaccurately detect a belted occupant as unbelted, possibly causing the air bag and seat belt pretensioners to deploy improperly in the event of a crash.
Risk: If the air bag and/or seat belt pretensioners deploy improperly in the event of a crash, there is an increased risk of injury to the driver and front passenger.
Fix: BMW will notify owners, and dealers will inspect and replace the front seat belt buckles, as necessary, free of charge. The recall began May 18, 2020. Owners may contact BMW customer service at 1-800-525-7417.
Structure:body:trunk Lid 2019-10-23 · campaign 19V755000 · 325 vehicles
Defect: BMW of North America, LLC (BMW) is recalling certain 2020 330i, 330i xDrive and M340i vehicles. The interior trunk release cable may have been improperly installed, preventing the opening of the trunk from the inside. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 401, "Internal Trunk Release."
Risk: If a person were inside the trunk compartment, they may not be able to get out, increasing their risk of injury.
Fix: BMW will notify owners, and dealers will inspect the interior trunk release cable and properly install the cable, as necessary, free of charge. The recall began December 13, 2019. Owners may contact BMW customer service at 1-800-525-7417.
Back Over Prevention: Sensing System: Camera 2019-09-27 · campaign 19V684000 · 257,473 vehicles
Defect: BMW of North America, LLC (BMW) is recalling certain 2018 540d, 2018-2020 530i, 530i xDrive, 540i, 540i xDrive, M550i xDrive, M5, 530e, 530e xDrive, X3 sDrive, X3 xDrive, X3 M40i, X3 M, and 2019-2020 X4 xDrive, X4 M40i, X4 M, X7 xDrive, X7 M50i, 740Li, 740Li xDrive, 750Li, 750Li xDrive, 8 Series Convertible and Coupe 840i, 840i xDrive, M850i xDrive, X5 sDrive, X5 xDrive, X5 M50i, X6 xDrive, X6 M50i, 330i, 330i xDrive, M340i, M340i xDrive, Z4 sDrive, Z4 M40i, 740Le xDrive and 745Le xDrive, 2018-2
Risk: The lack of an image in the back-up camera display increases the risk of a crash.
Fix: BMW will notify owners, and dealers will update the back-up camera software, free of charge. The recall began November 8, 2019. Owners may contact BMW customer service at 1-800-525-7417 or Rolls-Royce at 1-877-877-3735. Toyota owners may contact Toyota customer service at 1-888-270-9371.
Seats 2019-08-14 · campaign 19V600000 · 2 vehicles
Defect: BMW of North America, LLC (BMW) is recalling one 2020 M340i and one M340i xDrive vehicle. Due to improper welding, the rear center headrest may fold in the event of a rear impact crash.
Risk: If the headrest folds down in a crash, there would be an increased risk of injury.
Fix: BMW will notify owners, and dealers will replace the rear center headrest, free of charge. The recall began August 28, 2019. Owners may contact BMW customer service at 1-800-525-7417.
Service bulletins (251)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Structure:body 2025-04-15 · B010325 · Warranty Program/Extension
the radiator grilles lower active air flap assembly limited warranty for defects in materials and/or workmanship has been extended to 15 years / 150,000 miles as determined from the original first in-service / delivery date.
Electrical System 2024-01-11 · B611305 · Service Bulletin/Repair Instructions
the electrical system of bmw vehicles has been subject to an ongoing development process over the last few years. this has led to increased demands being placed on the battery. this document covers important information for the dealer on how to handle ã¢ââdischarged batteryã¢ââ complaints.
Service Brakes, Hydraulic 2023-10-13 · B340714 · Service Bulletin/Repair Instructions
functional noises (squealing/honking) when braking shortly before the vehicle comes to a stop. cause material-
Power Train 2023-08-01 · B240323 · Service Bulletin/Repair Instructions
?a software error may cause an unwanted pressure pulsation in the transmission during a "remote engine start."
Suspension 2023-07-01 · B410323 · Service Bulletin/Repair Instructions
the left front suspension's aluminum strut dome (general area circled) was incorrectly riveted to the body's wheel-well.
Exterior Lighting 2023-06-01 · B630821 · Service Bulletin/Repair Instructions
headlight check control (cc) message 128 "high beam headlight failure" is displayed. the following fault codes are stored during a vehicle test: 80419a - left high-beam headlight: short circuit and/or 8041a5 - light outputs: number of permitted short circuit cycles exceeded
Showing the 6 most recent of 251 bulletins. Search all of them free at nhtsa.gov.
What owners report
2026-10-26 · Engine“oil pump issue, oil starvation to engine making it unreliable …”
2026-10-23 · Engine“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 oil pressure. field failures are increasingly being …”
2026-10-22 · Engine“plastic components in the oil pump went out. bmw has made new oil pumps with metal components that are less fragile and do not fail as often. outside of warranty these repairs can be very costly. i have had to pay out of pocket for these repairs myself. i do not understand why this is not a recall.…”
2026-10-22 · Engine“i'm reporting a safety issue with bmw vehicles equipped with the b58tu engine, primarily 2019-2021 models. these vehicles have an oil pump with an internal plastic component that regulates oil pressure, and this part is fracturing in the field, causing sudden loss of oil pressure. the failure typically occurs during cold starts in low temperatures.…”
2026-09-01 · Engine“oil pump for the 2020 model is made with plastic internals. the passage that controls the flow of oil into your engine is made of plastic. the car didn’t even have 40,000 miles and the plastic broke causing the passage to be in a very close to shut position not allowing enough oil to enter the engine in higher rpm. the mechanic told me this is the …”
2026-08-13 · Engine“i am reporting a premature oil pump failure on my 2020 bmw m340i xdrive with 42 thousand miles. the vehicle has been well maintained and has not experienced any oil pressure warning lights. however, the electronic engine oil level measurement repeatedly fails to complete once the engine is fully warmed up. i have also received stored bmw fault co…”
2026-07-31 · Engine“component involved:engine mechanical / variable-displacement engine oil pump (part #11418635032 / updated #11419895359) description of safety hazard / defect:the early-generation b58tu engine features a variable-displacement oil pump equipped with an internal thermoplastic (plastic) adjusting ring. due to continuous thermal cycling and mechanical s…”
2026-07-14 · Engine“safety hazard: oil pump failure leading to sudden engine stall (bmw b58tu engines) description of defect: the oil pump module in the 2020 bmw m340i (g20) and many other models between 2019-2020 contains internal plastic components that are prone to thermal degradation and premature failure. these plastic parts can crack or disintegrate, causing a …”
2026-07-06 · Engine“i am submitting this complaint regarding a potential safety defect involving the engine lubrication system on my 2020 bmw m340i with the b58 engine. the vehicle was purchased used from a single owner with low mileage and comprehensive maintenance records, with no indication of prior engine or lubrication issues. while traveling at highway speed, th…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.