2015 Mercedes-Benz C300 Engine cooling Problems
- Complaints
- 2about this part
- Share
- 1%of 381 total for the year
- Median mileage
- 70,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 2 complaints about the engine cooling of the 2015 Mercedes-Benz C300, 1% of the 381 complaints for this model year. Where a mileage was given, the median is 70,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“The contact owns a 2015 Mercedes-Benz c300w4. After starting the vehicle, the odor of mold entered the cabin of the vehicle through the HVAC system. Mercedes-benz of mobile in mobile, alabama replaced the air filters and cleaned the cooling system within the HVAC twice, but the failure recurred. The manufacturer was not made aware of the issue. The failure mileage was approximately 15,000.”
NHTSA complaint #11023294, filed 2017-09, 15,000 miles“The contact owns a 2015 Mercedes-Benz C300. The contact stated while driving 25 MPH, the check engine warning light illuminated. The contact veered to the side of the road. The vehicle was towed to an independent mechanic, where the diagnostic test retrieved code: P052E, and it was determined that the positive crankcase ventilation (PCV) valve had failed and needed to be replaced. The vehicle was not repaired. The dealer and the manufacturer were not notified of the failure. The failure mileage was approximately 125,000.”
NHTSA complaint #11538997, filed 2023-08, 125,000 milesRelated service bulletins
- 10253722Apr 15, 2024Check engine light illuminated Fault code stored in N3/10 control unit- P052E71 Positive Crankcase Ventilation Regulator Valve Performance: The valve for crankcase ventilation…
- 10246281Nov 17, 2023Fault code P06DA00 is found current or stored in engine control unit. Check engine light may be activated. Various causes Up to Model year 2018 Fault code P06DA00 can be…
- 10243565Sep 22, 2023In our continuing efforts to assure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA (âMBUSAâ) is…
- 10243308Sep 12, 2023Check engine light illuminated Fault code stored in N3/10 control unit- P052E71 â Positive Crankcase Ventilation Regulator Valve Performance: The valve for crankcase…
- 10241531Aug 24, 2023In our continuing efforts to assure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA, LLC (âMBUSAâ) is…
- 10209874Mar 11, 2022Mercedes-Benz AG (âMBAGâ), the manufacturer of Mercedes-Benz, has determined that on certain MY 2015-2018 C-Class and GLC-Class (205 and 253 platform) vehicles, the software…
- 10206077Dec 8, 2021"MY15+ M278 and M157 Equipped Vehicles with Fault Code ""P023400 â Boost Pressure is Too High"" "
- 10205790Aug 2, 2021After starting the engine, the instrument cluster shows the "EBD not available, diagnosis/test stand" message in yellow.
- 10162206May 28, 2019Check coolant hose from expansion reservoir to cooler and replace if necessary
- 10144075Mar 12, 2018Check Engine Light is on with DTC P030185/ P030685 for misfire cylinder 1 and 6.
Engine cooling: other model years
Other parts of the 2015 Mercedes-Benz C300
127 complaintsFuel system
70 complaintsOther or unknown
63 complaintsBody and structure
60 complaintsElectrical system
50 complaintsSteering
23 complaintsSuspension
22 complaintsTransmission and drivetrain
20 complaintsVisibility (wipers, defrost, mirrors)
16 complaintsAir bags
12 complaintsBrakes
9 complaintsForward collision avoidance
8 complaints
← All problems reported for the 2015 Mercedes-Benz C300
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology