There are 1 owner-reported powertrain & transmission complaints for the 2004 Mercedes-Benz SL-Classin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
THE AUTOMATIC TRANSMISSION FAILED TO UPSHIFT BEYOND THIRD GEAR WHILE DRIVING DOWN HIGHWAY. COULD ONLY GO 30MPH AS REVS HIGH. HAD TO TAKE VEHICLE TO DEALER TO REPAIR TRANSMISSION. ONLY 39,000 MILES ON CAR. NOT ABUSED. *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