Vehicle Data Hub

2020 BMW M340I engine problems

44 complaints about engine have been filed for the 2020 BMW M340I, which is 65% of all its NHTSA complaints. It is the most reported problem area for this model year.

At a glance

Complaints
44 65% of this year's complaints
Crashes and fires
0 and 0
Injuries and deaths
0 and 0

Source: NHTSA owner complaints

What the data shows

None of the engine complaints mention a crash, fire, injury or death.

What owners wrote

The engine oil pump has failed. The part is available for inspection. The failed oil pump causes the engine to blow up, leaving oil and coolant behind on the road as hazards and causing our vehicle violently spin out on the road. The problem has been reproduced multiple times and claimed by bmw dealerships to be faulty on multiple occasions. Upon further research, it has affected 80% of the 2019 and 2020 g series chassis vehicles with the B58tu engine. BMW has a known problem of failed oil pump.

January 2023

The contact owns a 2020 BMW M340I. The contact stated that after an oil change was performed by an independent mechanic, there was a large amount of gray smoke coming from the exhaust pipe while accelerating from a complete stop. There was no warning light illuminated during the failure. The vehicle was taken to various independent mechanics, and the failure was associated with the PCV (Positive Crankcase Ventilation) valve cover.

Reported at 46,500 miles, December 2025

Engine problems in other years

  • 2026
  • 2025
  • 2024
  • 2023
  • 2022
  • 2021
  • 2020
  • 2019

Engine problems across all BMW models