2020 BMW M340i engine problems

The 2020 BMW M340i has 36 engine complaints filed with NHTSA — 60% of the year's total, and the first year with meaningful reports in this category.

Engine complaints

60%

Share of year

Crash-involved

Related recalls

Engine complaints by year

M340i engine complaints by model year. Red bars are years to avoid.

Related recalls

24V576000EngineAugust 1, 2024 · 105,588 units

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.

Consequence

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.

21V598000EngineAugust 2, 2021 · 50,024 units

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.

Consequence

Loss of braking assist can increase the risk of a crash.

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.

What owners report

“Car will not measure oil past 20%. Seems like lots of 2020 models have a faulty production oil pump. Car is now out of warranty and dealer charged $5000 to fix the issue but do not know 100% if oil pump replacement will fix it. BMW changed the oil pump in the later models but did not mention…”
Complaint filed with NHTSA · Engine · December 27, 2024

Common questions

How many engine complaints does the 2020 BMW M340i have?

NHTSA has 36 complaints about the 2020 BMW M340i engine — 60% of all complaints filed for that model year.

Are there recalls for the 2020 BMW M340i engine?

Yes — 2 NHTSA recall campaigns for this model year are tied to the engine: 21V598000, 24V576000.

Based on NHTSA ODI data through June 2026. Complaints are consumer-reported and unverified. Updated July 5, 2026.

Compiled by Sharon Ben-Moshe, Founder.