2020 BMW M340I problems & reliability
50 owner complaints filed with NHTSA for the 2020 BMW M340I, alongside 10 safety recall campaigns. Last verified Aug 7, 2026. Complaints are unverified reports submitted by owners to the federal Office of Defects Investigation.
Each complaint is counted once (by NHTSA case number), even when it names several vehicles.
Federal crash records (FARS 2020–2023): 2020 BMW M340I vehicles were involved in 6 fatal crashes with 3 occupant deaths. Involvement counts are not adjusted for how many are on the road and do not imply fault or a vehicle defect.
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Engine → | 35 | 70% |
| Unknown OR Other | 9 | 18% |
| Electrical System | 6 | 12% |
| Engine and Engine Cooling | 4 | 8% |
| Fuel/propulsion System | 3 | 6% |
| Power Train | 2 | 4% |
| Tires | 2 | 4% |
| Service Brakes | 1 | 2% |
| Wheels | 1 | 2% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
Complaints by incident 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. Due to continuous…”
Engine · 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 plastic parts can…”
Engine · 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…”
Engine · filed Jul 6, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Technical service bulletins
251 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 2020 BMW M340I. The 10 most recent:
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…
B010325 · Warranty Program/Extension · issued Apr 15, 2025
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…
B611305 · Service Bulletin/Repair Instructions · issued Jan 11, 2024
Functional noises (squealing/honking) when braking shortly before the vehicle comes to a stop. CAUSE Material-
B340714 · Service Bulletin/Repair Instructions · issued Oct 13, 2023
?A software error may cause an unwanted pressure pulsation in the transmission during a "Remote Engine Start."
B240323 · Service Bulletin/Repair Instructions · issued Aug 1, 2023
The left front suspension's aluminum strut dome (general area circled) was incorrectly riveted to the body's wheel-well.
B410323 · Service Bulletin/Repair Instructions · issued Jul 1, 2023
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…
B630821 · Service Bulletin/Repair Instructions · issued Jun 1, 2023
Condensation is present on the inner surfaces in one or both taillights (circled).
B630321 · Service Bulletin/Repair Instructions · issued Jun 1, 2023
In the event of an accident, the two-battery Dual Storage System (DSS) is disconnected from the electrical system via an internal relay.
B611320 · Service Bulletin/Repair Instructions · issued Jun 1, 2023
BMW AG has issued an Emissions Recall (effective March 17, 2023) on a certain Model Year 2021 - 2023 BMW vehicles that were produced between June 16, 2020, and December 13, 2022. Due to a software failure, there is the…
B240223 · Service Bulletin/Repair Instructions · issued Jun 1, 2023
A vehicle arrives at your center to be diagnosed for a micro-leak in the fuel evaporative (EVAP) system (NVLD natural vacuum leak detection). For this condition, the following fault is stored in the DME: 190302 - fuel…
B160123 · Service Bulletin/Repair Instructions · issued Jun 1, 2023
TSBs are repair guidance manufacturers send to dealers — they are not recalls and repairs are not automatically free. Full documents are available on NHTSA’s site.
Safety recalls
The 2020 BMW M340I has 10 NHTSA recall campaigns — recall repairs are free at franchised dealers regardless of the vehicle’s age.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →Buying a used 2020 BMW M340I?
- · Decode the seller’s VIN with our free VIN decoder to confirm the exact year, engine and trim.
- · Check for unrepaired recalls by VIN on NHTSA’s official lookup — recall repairs are free.