2020 BMW M340I engine problems
35 owner complaints filed with NHTSA name the engine on the 2020 BMW M340I — 70% of all complaints for this model year.
What owners report
“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…”
filed Jul 31, 2026
“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…”
filed Jul 14, 2026
“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…”
filed Jul 6, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related recalls
- Please see the recall report for the complete list of modelsCampaign 24V576000 · Aug 1, 2024
- During engine start, the engine management software may cause loss of braking assistCampaign 21V598000 · Aug 2, 2021
Other reported problem areas on the 2020 BMW M340I
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.