Rear subframe corrosion and structural failure
STRUCTURE
49 NHTSA complaints · 2018-04 → 2025-10
“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”
“Rear subframe rusted through near connection with control arm. This left the rear wheel connected to the rest of the car only through an axle and sway bar. This is a very common issue on these vehicles, and was remedied through the replacement of the subframe”
“REAR SUB FRAME CRACKED - CAUSING VEHICLE SHAKE AT HIGHWAY SPEED”