2015 Mercedes-Benz C300 · symptom sheet
Check engine light or misfire
- 62owner reports
- 61,000median miles
- $2,000median quote
- 0involved a crash
Newest report Jun 26, 2025 · checked Oct 2, 2026
216 of the 380 complaints on this car are about the engine. 62 of those describe misfire, which makes it the most reported problem on the 2015 C300.
Tick what matches of 62 reports
Misfire on other C300 years
Report counts are for each model year on its own, so a newer car has had less time to collect them.
What this problem usually is
These reports start with the check engine light. Many describe the engine running rough or shaking at idle, a P0300-series code, or a catalytic converter code. A worrying number say the light was flashing. Owners often list ignition coils or spark plugs already replaced, and the light coming back afterward.
What got replaced
Owners who name the part that was replaced mention the spark plugs (4 reports).
Recalls and investigations
3 recalls on the engine cover the 2015 model year. A recall on the same system isn't always the same failure, so read the defect text.
Various control units on these vehicles may have been updated with incorrect software, potentially affecting the correct deployment of the air bags in the event of a crash.
In the event that the engine or transmission cannot turn over, the starting current limiter may overheat from the repeated attempts of the starter motor attempting to start the vehicle.
In the affected vehicles, the fuel delivery module may be improperly secured to the fuel tank.
All 11 recalls on the 2015 Mercedes-Benz C300, with the owner complaints on each recalled system
NHTSA investigations into the engine on the C300
C300 wrist-pin allegation. Closed feb 27, 2024.
Loss of rear lighting assembly. Closed may 12, 2014, led to recall 14V-177.
What owners paid
7 of the 62 reports quote a price. Each dot is one quote. The middle half runs $1,000 to $2,200.
When it happens
The middle half of failures fell between 50,900 and 80,000 miles, from the 27 reports that gave a mileage.
Is this a known problem?
The manufacturer has sent NHTSA 4 service bulletins or notices for the 2015 Mercedes-Benz C300 that deal with this problem. Newest first.
Federal rules make a manufacturer send NHTSA a copy of any notice about a defect that goes to more than one dealer or owner. Most of these are service bulletins, the repair instructions manufacturers send to dealers. NHTSA generally leaves safety recall bulletins out of this file, and recalls are listed separately.
Complaint Check engine light illuminated Fault code stored in N3/10 control unit- P052E71 – Positive Crankcase Ventilation Regulator Valve Performance: The valve for crankcase ventilation has a malfunction Cause The partial-load ventilation valve (a part of ...
Complaint Check engine light on. One of the below fault codes is current in the engine control module (N3/10). P04DB29, P04DB31, P04DB79 Cause Open circuit or high resistance to crankcase vent line contact Remedy 1.
Check engine light illuminated Fault code stored in N3/10 control unit- P052E71 Positive Crankcase Ventilation Regulator Valve Performance: The valve for crankcase ventilation has a malfunction The partial-load ventilation valve (a part of the intake line ...
Check Engine Light is on with DTC P030185/ P030685 for misfire cylinder 1 and 6.
What owners wrote
“Check Engine light came on recently, fault code P052E is identified by scanner. Car has 60,000 miles on original it. MB dealer wants to charge $300 for diagnostics, repair job (parts and labor) may cost over $2,000. Since this is critical emission compliance part/system, why is it not recalling?”
Filed Jun 26, 2025 · 60,000 miles
“My 2015 Mercedes Benz vehicle is rarely driven as I took public transportation to work and has ~55000 miles. However, the engine has started throwing error code P052E verified by an independent dealer - crankcase ventilation valve failure. It means the engine could shut off amid driving and I did research and it seems like a very common issue that Mercedes Benz car owner encounter and feels like a severe car defect.”
Filed Jan 29, 2024 · 55,000 miles
“Vehicle experienced loss of power and rough running when check engine light came on. Mercedes dealer reported one of the pistons cracked resulting in catastrophic engine failure with just shy of 61,880 miles on it.”
Filed Jan 12, 2023 · 61,880 miles
“I have an emissions related Check Engine Light (P052E71) relating to the Evaporative/Crankcase ventilation system. I think this should be a Recalled/Warrantee item on the 10 year/100,000 miles federally mandated guarantee. Please advise...”
Filed Jan 5, 2023 · 100,000 miles
Should you keep driving it?
This page can't tell you that. 0 of 62 reports involved a crash. Owners who file are the ones who had a bad experience, and nobody checks their reports. If the problem affects steering, braking, power or a fire risk, treat it as a safety fault and have it inspected before a long or high-speed drive.
File your own report with NHTSA. Complaint counts are how a problem gets an investigation. How reports land on this sheet.
Guide Which lights mean pull over now? Warning lights by color and urgency
Other problems on this car
- Engine stalls or loses power while driving 31 reports