PROBLEM GUIDE
Here's what owners are experiencing, based on our research of real owner reports and repair data.
Last updated April 2026
442
complaints filed for the 2015 model year
2015–2016
Model years affected
$1,750 – $2,250
Typical repair cost, by problem
Click a problem for the full write-up — symptoms, what we found, and typical repair costs where we have them.
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Start my diagnosis →Risk of suspension collapse and wheel detachment
Check engine light: On
Roughly 200+ of the 442 sampled complaints describe rear subframe corrosion — owners describe 'holes.rusting from inside out' despite protective measures, creating risk of suspension collapse, wheel detachment, and loss of vehicle control.
Same part number, different coverage outcome
Check engine light: On
Mercedes' extended warranty (20 years/unlimited miles) covers the 2008-2014 W204-generation C-Class for the same subframe defect, but excludes many 2015 W205-generation vehicles despite identical part numbers.
Fire hazard and toxic vapor exposure, reported as early as 28,000 miles
Check engine light: On
Raw gasoline leaks into the engine compartment and cabin, creating a fire hazard and toxic vapor exposure, reported on vehicles as new as 28,000 miles.
Melted plastic components and cracked guide rail clips in the tracks
Check engine light: Off
The panoramic sunroof spontaneously detaches while driving, with melted plastic components in the tracks and cracked guide rail clips.
Check engine light and emissions test failures
Check engine light: On
Crankcase ventilation valve failure (code P052E) triggers the check engine light and emissions test failures.
Cracked driveshaft flex discs may cause driveshaft movement or vibration
Check engine light: Off
Cracked driveshaft flex discs may cause driveshaft movement or vibration. This is among the more frequently reported issues on this generation, with 39 owner reports on file.
Oil seepage occurs on the back of the cylinder heads
Check engine light: Off
Oil seepage occurs on the back of the cylinder heads. This is among the more frequently reported issues on this generation, with 14 owner reports on file.
Brake rotors should be replaced when pads are worn and squeaking
Check engine light: Off
Brake rotors should be replaced when pads are worn and squeaking. This is among the more frequently reported issues on this generation, with 12 owner reports on file.
Mercedes' extended warranty (20 years/unlimited miles) covers the earlier W204-generation C-Class for the rear subframe corrosion defect, but excludes many 2015 W205-generation vehicles despite identical part numbers. Enter your VIN to get the confirmed, current recall picture for your specific car.
The information on this page is for general educational purposes only and is not a diagnosis. It is compiled from aggregated owner-reported data and publicly available sources, not from an inspection of your vehicle. Symptoms described here can have multiple causes, and the presence of a commonly reported problem does not mean your vehicle has it. Repair cost ranges are estimates that vary by region, shop, vehicle condition, and parts availability. Recall and service campaign information may be incomplete or out of date — verify current recall status with NHTSA or your manufacturer. MyGearGuru is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer; manufacturer and model names are used for identification only. Always consult a qualified technician before making repair decisions.
IMPORTANT — REAR SUBFRAME CORROSION IS WIDELY REPORTED ON THIS GENERATION. Roughly 200+ of 442 complaints describe rear subframe corrosion. Owners describe holes rusting from the inside out despite protective measures, creating risk of suspension collapse, wheel detachment, and loss of vehicle control. Owners report that Mercedes' extended warranty covers the earlier W204-generation C-Class for this same defect but excludes many 2015 W205-generation vehicles despite identical part numbers.