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Electrical systemPart report

2021 BMW M340I Electrical system Problems

Complaints
2about this part
Share
18%of 11 total for the year
Median mileage
—not reported
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 2 complaints about the electrical system of the 2021 BMW M340I, 18% of the 11 complaints for this model year. 2 recall campaigns on record are filed under a similar system.

Fewer than 15 complaints name this part, so treat the figures as a rough indication only.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“Here’s a strong version that sounds frustrated but still credible and harder to dismiss: I’ve owned many vehicles over the years, and this BMW has been, without question, the most problematic car I’ve ever had. The list of issues has been absurd for a vehicle in this price range and from a brand that markets itself as a premium luxury manufacturer. …”

NHTSA complaint #11738468, filed 2026-05

“I have been smelling a burning odor in the vehicle for almost a year which the dealership and an independent shop had not been able to diagnose. The car was recently throwing Drivetrain Error codes which prompted a visit to the dealership. They found that the 48v battery and negative cable are burnt and quoted $5680 to replace the battery and cables. After investigating I found that there were recalls for this issue on other BMWs, including the same year and model of my vehicle, but my VIN is not pulling up a recall. …”

NHTSA complaint #11747887, filed 2026-07

Related recalls

Related service bulletins

Electrical system: other model years

YearComplaintsShare of year
2022114%
2021218%
2020611%

Other parts of the 2021 BMW M340I

Engine
7 complaintsTransmission and drivetrain
3 complaintsBrakes
1 complaintsFuel system
1 complaintsSteering
1 complaintsSuspension
1 complaints

← All problems reported for the 2021 BMW M340I

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology