2021 BMW X4 Other or unknown Problems
- Complaints
- 1about this part
- Share
- 17%of 6 total for the year
- Median mileage
- —not reported
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 1 complaints about the other or unknown of the 2021 BMW X4, 17% of the 6 complaints for this model year.
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.
“transfer case AWD/xDrive system drivetrain components The dealer diagnosed a transfer case failure on the BMW X4 xDrive. Vehicle displayed drivetrain malfunction warning. Repair estimate exceeds $20,000. The vehicle has under 50,000 miles. The issue appears consistent with known xDrive transfer case complaints. The warning light came on on January 7, 2026, at approximately 6 pm.”
NHTSA complaint #11709969, filed 2026-01Related service bulletins
- 10236229Apr 1, 2023Due to the semiconductor supply, the Local Interconnect Network module in either of the exterior mirrors was switched to another controller.
- 10227571Oct 1, 2022The seal of the roof-mounted antenna housing is separating from the vehicle.
- 10206692Dec 1, 2021The SIM card installed in the telematics control unit (ATM2) connects to different mobile providers' networks. However, due to a missing parameter, this does not work and can…
Other or unknown: other model years
Other parts of the 2021 BMW X4
2 complaintsSeat belts
2 complaintsSuspension
1 complaintsTransmission and drivetrain
1 complaints
← All problems reported for the 2021 BMW X4
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