There are 1 owner-reported powertrain & transmission complaints for the 2004 BMW 6 Seriesin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
BMW 645CI: TRANSMISSION SURGES BETWEEN SPEEDS OF 30-40MPH WHILE APPLYING CONSTANT THROTTLE. *TR
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026