2009 Mercedes-Benz C300 structure problems
27 owner complaints filed with NHTSA name the structure on the 2009 Mercedes-Benz C300 — 5% of all complaints for this model year.
What owners report
“Vehicle inspection by independent service center indicated that a new rear frame was necessary. This was the second communication to nhtsa on this issue. This automobile (2009 c300) is inoperable due to this Mercedes rear frame defect .”
filed Oct 12, 2025
“The contact owns a 2009 Mercedes-Benz C300. The contact stated that while driving at various speeds, the rear end of the vehicle would fishtail and become extremely unstable while driving over a bump in the road or while turning. Upon inspection, the contact discovered that the subframe was…”
filed Nov 12, 2024
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
Complaint Clanking noise from the area of the speakers in the doors. Cause Under analysis. Remedy To narrow down the cause, first of all remove the door trim. • If the noise continues to occur even with the door trim…
LI82.62-P-078631 · Service Bulletin/Repair Instructions · issued Aug 6, 2026
Structure problems in other C300 years
| Year | Reports | Share |
|---|---|---|
| 2016 C300 | 26 | 9% |
| 2015 C300 | 59 | 16% |
| 2014 C300 | 9 | 10% |
| 2013 C300 | 58 | 22% |
| 2012 C300 | 54 | 20% |
| 2011 C300 | 49 | 10% |
| 2010 C300 | 34 | 8% |
| 2008 C300 | 9 | 1% |
Other reported problem areas on the 2009 Mercedes-Benz C300
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.