There are 1 stored owner reports matching the powertrain & transmission leading-label group for the 2004 Mercedes-Benz SL-Class in our NHTSA-sourced dataset. These are unverified consumer reports and may not reflect confirmed defects.
This group counts stored reports whose component label starts with one of this site's matching prefixes, ignoring case. Each matching report counts once within the group. Components mentioned later in the label or only in the narrative are not searched. How component counts work
Loaded 1 of 1 matching reports.
Open the full vehicle complaint log (all categories)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.
NHTSA source checks for this vehicle year
Checks are recorded separately for each dataset, not for the whole page. Dates use UTC. A missing check date does not mean no records exist.
Vehicle import recorded: Aug 31, 2026. This is the stored import date, not confirmation that every source was successfully refreshed.