2020 BMW M340i reliability

Is it reliable?

The 2020 BMW M340i has 53 complaints with NHTSA after 7 years, or 1 per year. That is the most complaints per year among the 5 M340i years on this site. NHTSA has 10 recalls on file, including Starter, Seat belts, and Seats.

Complaints

Per year

Recalls

Years on the road

What owners report

The complaints owners file most often name Engine (38 of 53), then Electrical system (6) and Engine and engine cooling (4).

Next to 2021

The 2021 M340i has 11 complaints, 1 per year. The 2020 has more complaints per year than the 2021.

The complaint rate is complaints filed in this year’s first 3 years on the road, divided by however many of those years have passed. Recalls are a separate count. The numbers are for the US-market 2020 BMW M340i. How we count. Data as of 2026-10-16.

Recalls (10)

Recall electrical system, starter 2024-08-01 · NHTSA campaign 24V576000

Summary 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.

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.

Recall Seat belts 2023-08-16 · NHTSA campaign 23V584000

Summary 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."

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.

Recall Seats 2023-03-29 · NHTSA campaign 23V211000

Summary 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.

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.

Recall Engine 2021-08-02 · NHTSA campaign 21V598000

Summary 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.

Remedy 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.

Recall back-over prevention, sensing system, camera 2021-02-19 · NHTSA campaign 21V096000

Summary 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 xDrive50i, X6 M50i, X6M, 530i, 530i xDrive, 540i, 540i xDrive, M550i xDrive, M5, 740i, 740Li, 740Li xDrive, M760i Drive, M760Li xDrive, 750Li xDrive Alpina, Alpina B7 xDrive, and 2021 4 Series Coupe 430i, 430i xDrive, M440i xDrive vehicles. 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."

Remedy 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.

Recall steering, linkages, tie rod 2020-06-15 · NHTSA campaign 20V355000

Summary 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.

Remedy 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.

Recall seat belts, front, buckle 2020-03-19 · NHTSA campaign 20V164000

Summary 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.

Remedy 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.

Recall structure, body, trunk lid 2019-10-23 · NHTSA campaign 19V755000

Summary 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."

Remedy 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.

Recall back-over prevention, sensing system, camera 2019-09-27 · NHTSA campaign 19V684000

Summary 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, 2018-2019 640i xDrive Gran Turismo and Rolls-Royce Phantom, 2019 M850i xDrive Gran Coupe and Rolls-Royce Cullinan and 2020 Toyota Supra vehicles. The back-up camera and display settings can be adjusted such that the rear view image is no longer visible and the system will retain that setting the next time the vehicle is placed in reverse. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 111, "Rearview Mirrors."

Remedy 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.

Recall Seats 2019-08-14 · NHTSA campaign 19V600000

Summary 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.

Remedy 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.

Complaints by component (53 total)

Engine

Electrical system

Engine and engine cooling

Fuel and propulsion system

Powertrain

Tires

Service brakes

Wheels

Crash-flagged

Fire-flagged

Injury reports

Death reports

Complaints filed per year

Excerpts from recent NHTSA complaint filings

"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…"
Engine · filed 2026-09-13
"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…"
Engine · filed 2026-09-01
"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 · filed 2026-08-13
"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…"
Engine · filed 2026-07-31
"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…"
Engine · filed 2026-07-14

Fuel economy

Trim	Engine	Transmission	Drive	City	Hwy	Combined	Annual fuel cost
M340i	3L, 6-cyl	Automatic (8-speed)	Rear-wheel drive	22	30	25 MPG	$3200
M340i xDrive	3L, 6-cyl	Automatic (8-speed)	All-wheel drive	22	30	25 MPG	$3200

Specs and fitment

G20 generation, 2020–present

Body styles Sedan

Oil SAE 0W-20 (B58; confirm BMW LL spec on under-hood label)

Tire size 225/35R19, 225/40R18, 225/45R17, 255/30R19, 255/35R18 (trim-dependent; staggered) front / 255/30R19, 255/35R18 (trim-dependent; staggered) rear

Known issues for this generation

Recall 21V598000 covers certain 2020 M340i and M340i xDrive models (with 540i, X3 M40i, X4 M40i, 745Le, and other B58 applications) for an engine concern on that campaign list; dealers perform the remedy described in NHTSA's campaign text. Recall 20V355000 covers certain 2019-2020 M340i and M340i xDrive models (with Z4, X3M, X4M, and 330i xDrive) for a tie rod assembly that may fail. Recall 19V755000 covers certain 2020 M340i models (with 330i) where the interior trunk release cable may have been incorrectly routed.

Compare

Next year 2021 BMW M340i See every BMW M340i model year →

Frequently asked questions

Is the 2020 BMW M340i reliable?

What are common problems with a 2020 BMW M340i?

The complaints owners file most often name Engine (38 of 53), then Electrical system (6) and Engine and engine cooling (4).

Is the 2020 BMW M340i more reliable than the years next to it?

The 2021 M340i has 11 complaints, 1 per year. The 2020 has more complaints per year than the 2021.

Has the 2020 BMW M340i been recalled?

The 2020 BMW M340i has 10 recalls on file with NHTSA. See the recalls table on this page for dates, components, and remedies.

How many complaints have owners filed about the 2020 BMW M340i?

Owners have filed 53 complaints about the 2020 BMW M340i with NHTSA.

What mpg does a 2020 BMW M340i get?

EPA-rated combined fuel economy for the 2020 BMW M340i is 25 MPG. See the fuel economy table on this page for city and highway figures by engine and transmission.

What engine oil does a US BMW M340i use?

SAE 0W-20 (B58; confirm BMW LL spec on under-hood label)

What tire sizes fit a US BMW M340i?

Published US specs commonly list front 225/35R19, 225/40R18, 225/45R17, 255/30R19, 255/35R18 (trim-dependent; staggered) and rear 255/30R19, 255/35R18 (trim-dependent; staggered); confirm on the door jamb placard for your trim.

What NHTSA recalls affect the US BMW M340i?