2016 Mercedes-Benz C-Class
Problems, recalls and owner-reported issues
Engine is the leading concern among 316 owner complaints filed for this model year. This is the 8th highest complaint count among 23 C-Class model years with reports.
Of the 2016 reports, 7 involved a crash and 5 involved a fire. 8 people were injured.
What owners report most often
Recalls and investigations
No safety recalls on file.
Representative owner complaints: engine
100 reports, newest first. Show all
Engine, May 22, 2026
NHTSA Safety Complaint – 2016 Mercedes-Benz C300 Vehicle: 2016 Mercedes-Benz C300 | Mileage: 74,662 miles What Happened I’m filing this complaint because my 2016 Mercedes-Benz C300 suffered a sudden, complete engine failure at 74,662 miles, and I believe it’s a safety risk that deserves investigation. I’ve owned this car since 2016 and followed every recommended service interval. All available warranties were purchased and maintained. The car showed absolutely no signs of trouble before this happened. Last week before filing, I was driving normally when the check engine light came on without any prior warning — no oil pressure light, no temperature alert, nothing else. Within minutes, the engine shut off completely. The car rolled to a stop and I noticed oil leaking from the front of the engine. It was towed to an authorized Mercedes-Benz dealership, where they confirmed the engine suffered a catastrophic internal failure and needs to be fully replaced. Why This Is a Safety Concern No advance warning. The check engine light appeared only minutes before the engine died. That’s not enough time to safely exit a highway or busy road. A sudden total engine failure at speed affects steering, braking assist, and reaction time — it could easily cause a serious accident. Engine failure at 74,662 miles is not normal. A complete engine failure on a well-maintained luxury vehicle at under 75,000 miles strongly suggests a manufacturing defect or design flaw, possibly affecting other vehicles of the same model year. Oil leak at engine front. The leak observed at failure likely points to a specific component or seal failure. If this is a design weakness, other 2016 C300 owners may be at risk without knowing it. What I’m Requesting 1.Open an investigation into the 2016 Mercedes-Benz C300 for sudden engine failure and inadequate warning systems. 2.Determine whether other owners have reported similar incidents. 3.Evaluate whether a safety recall is warranted.
Power train, Electrical system, Engine, Apr 24, 2026
My C300 MBZ, 2016 is experiencing the same symptoms as indicated in a recall, but my vehicle is not included in that recall. Camshaft: GENERAL REPAIR A cam is a rotating or sliding piece in a mechanical linkage used especially in transforming rotary motion into linear motion or vice versa. Cams act as a vital component to your automobile's engine. A camshaft is a shaft to which a cam is fastened or of which a cam forms an integral part. Camshafts provide power to the cams which are vital for basic engine operation. The cost of fixing this approximately $10,000 per Mercerdes dealer and estimate from Keyes Mercerdes. The Brief: Mercedes-Benz issued a recall for some model cars tied to a faulty drive shaft.T he problem not only can cause vehicles to lose power but may elevate crash risk, according to the National Traffic Safety Administration. Owners of the affected vehicles can take them to their local dealership to receive free repairs, however per MBZ corporate 2016 C300 not included? Mercedes-Benz is recalling 24,092 cars connected to a drive shaft universal joint that may break, resulting in a sudden loss of drive power.
Engine, Mar 30, 2026
2016 Mercedes-Benz C63 S AMG, M177 4.0L twin-turbo V8. This engine is marketed under Mercedes-Benz's "One Man, One Engine" philosophy — hand-assembled by a single master technician. It failed irreparably at 67,323 miles on a properly maintained vehicle owned by a 14-year Mercedes-Benz customer who has purchased six Mercedes-Benz vehicles. All maintenance performed on schedule with genuine OEM Mercedes-Benz parts at Mercedes-certified shops. At approximately 65,000 miles, check engine light illuminated with cylinder 7 misfire. A Mercedes-certified shop found and replaced a burnt spark plug and all 4 ignition coils with OEM parts. Misfire cleared. Three months later at 67,000 miles, shaking and check engine light returned. All 8 spark plugs replaced with OEM parts. Misfires returned within 100 miles — now on cylinders 1, 3, and 7 — accompanied by violent engine shaking and a fuel smell. Vehicle brought to authorized Mercedes-Benz dealer. Full diagnostic performed including borescope inspection. Confirmed: broken spark plug ceramic and unrepairable piston pitting in cylinder 4 and engine damage. Dealer confirmed engine is not repairable and recommends complete engine replacement. All findings documented on dealer repair order. Vehicle remains at the dealer and is available for inspection. Mercedes-Benz has published at least three Technical Service Bulletins on persistent misfires specific to this engine: LI54.21-P-062006 (multiple revisions — ECU ground faults, borescope protocol anticipating internal damage), LI07.61-P-073583 (post-turbo exhaust clamp failures), LI07.61-P-069688 (intake manifold cracks). Mercedes has acknowledged this defect pattern internally and has not issued a recall. Sudden power loss and violent shaking at highway speed is a direct safety hazard. NHTSA investigation warranted.
Engine, Fuel/propulsion system, Jan 29, 2026
fuel lines/ clamps defective causing a fuel leak. vehicle could catch on fire and fumes are extremely strong inside the cabin. issue confirmed by Mercedes dealer, mentioned there is an extended warranty up to 120,000 miles. rejected mine because i was at 120,300 miles. had to pay out of pocket. no warning lights or anything just the really strong smell of fuel and fuel range dropping. this is a very common issue thats known and should be a recall.
Engine, Dec 13, 2025
Vehicle developed OBD-II code P052E related to crankcase ventilation/PCV system malfunction. Issue causes improper crankcase pressure, rough idle, oil vapor smells, and check engine light. Independent research shows this is a common failure on 2015–2017 Mercedes C300 models. Repair requires replacement of crankcase vent/PCV assembly. This appears to be a premature emissions system failure.
Engine, Nov 14, 2025
CHECK ENGINE LIGHT appeared on dash at approximately 72k miles. Had code read and diagnosed by certified mechanic and he had an active code P06DA00(this code signifies an electrical fault, open circuit, or high resistance in the circuit for the oil pump control valve on vehicles with two stage oil pump, which can lead to incorrect oil pressure, which can cause engine damage if not addressed). Vehicle was taken to Harriman Mercedes in New York. They did not acknowledge an active code but wanted to diagnose and repair a stored code for a small evap leak, which was rectified with a new gas cap. After prying about the P06DA00 code, they finally admitted it did have a stored code but to ignore it because it had something to do with domestic and foreign car engine computers issues. How do you ignore an active code with a potentially serious engine issue and told to ignore it. I know for a fact that this is a common problem with these 2.0L engines in these cars for many years.
Engine and engine cooling, Electrical system, Jul 22, 2025
The contact owns a 2016 Mercedes-Benz C300. The contact stated that while at a stoplight, the energy saver START/STOP feature engaged, but the vehicle stalled and failed to restart. There were no warning lights illuminated. The vehicle was towed to an independent mechanic who determined that the START/STOP function failed to operate as designed. The mechanic informed the contact about NHTSA Campaign Number: 17V114000 (Electrical System, Engine and Engine Cooling). The local dealer was not contacted; however, the vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 56,000.
Engine, Fuel/propulsion system, Jun 9, 2025
Positive Crankcase Ventilation Regulator Valve Performance Code P052E indicates a fault in the Positive Crankcase Ventilation Regulator Valve Performance for a predetermined.
Electrical system, Engine, Mar 22, 2025
Check Engine Light on, I read the code is P052E, after read some information in internet there is positive crankcase ventilation regulatory valve needs to be replaced. My car is 52000 miles and it seems like happenned to people even with less miles on the cars
Engine, Fuel/propulsion system, Dec 12, 2024
Fuel is leaking inside cabin whenever I turn on my heat
Engine, Dec 5, 2024
I have noticed a recurring issue during the colder months where there is a strong gas smell inside the cabin, and I have also observed fuel dripping into the engine compartment. This issue seems to occur primarily in winter conditions. I was surprised to find that there has been no official recall or service bulletin addressing this concern, especially given the potential safety implications.
Engine, Dec 3, 2024
PCV fault
Engine, Sep 3, 2024
Check Engine light...P052E positive crankcase ventilation regulatory valve
Engine, Aug 17, 2024
my car broke down while driving on the freeway, with only 58,000 miles the piston broke in cylinder 1 causing my car to loose power can cause an accident due to breaking down on freeway problem has been confirmed by a certified mechanic shop check engine light started flashing the moment the engine failed
Engine, Aug 15, 2024
error code P052E positive crankcase ventilation regulator valve performance
Engine, Aug 12, 2024
This vehicle was 2nd owner via Mercedes CPO. Note I bought this 2016 in 2018 on CPO, so recalls and technical notes were confirmed to be resolved. Had last taken to Mercedes dealership. Vehicle was always running fine until about 64,000+ miles when a check engine light came on while just entering the freeway and the vehicle started shaking violently. Continue to drive the vehicle for a few miles to get to the destination. Had the vehicle towed to the dealership and the dealership declared that cylinder 1 had lost 80% compression and had a cylinder 1 piston crack. This is consistent with numerous claims on Mercedes message boards. Mercedes dealership said that this vehicle was not drivable and was not covered under warranty. Requested $11,000 for single piston repair or $15,000 for full engine rebuild replacement. Please note that M274 engine has this complaint. The engine is apparently a Nissan collaboration designed i-4 turbocharged engine and car is assembled in Alabama. Internal Mercedes technical bulletins talk about piston wrist pins. So Mercedes know there is an issue and they know status on my vehicle. Mercedes dealers have sent me documents on piston wrist pins replacement status. The recommendation is to rebuild or buy new motor. So i have no confidence that an engine rebuild will fix the issue. All oil change maintenance records show proper oil at proper intervals and multi-point inspections. Correct use of premium gas was used. Vehicle had been inspected and given all green remarks on multipoint review before the incident. - Got It ? Requesting investigation as I have 3 vehicles, Toyota (2002), Honda(2008), and YES a Mercedes(2005) with 216K miles. So don't tell me that this is my fault.
Engine, Jul 30, 2024
Code P052E71 Saying the Crankcase is bad. Seems to be an issue with MB.
Engine, Jul 25, 2024
check engine light p052e positive crankcase ventilation regulator value performance
Engine, Jun 12, 2024
P0952 sensor part not available untill Dec 2024 I have documentation from my mechanic
Engine, Apr 18, 2024
A couple years back I had an engine light pop up and it was the code P052E which as I’ve done my research and read a lot of forums this is a common problem with the W205 Mercedes Motors. As of today 04/18/24 the engine light came on and I got it diagnosed to find out it is the same problem again. This repair is almost $2000 and it is due to Mercedes faulty manufacturing of the PCV valve. I have read things that say there has been extended warranty on it and a lot of submissions for recalls, that I’m not exactly sure of.
Engine, Mar 30, 2024
Pcv valve has gone bad, and it seems like everyone i ask that is mercedes technician they all say these parts are terribly made and always break.
Power train, Engine, Fuel/propulsion system, Mar 25, 2024
The Positive Crankcase Ventilation (PCV) valve is crucial for regulating the flow of gases in the engine's crankcase. If the PCV valve malfunctions or becomes clogged in a car like the 2016 Mercedes Benz C300 4-matic, several problems can arise: 1. **Increased Pressure:** A malfunctioning PCV valve can cause pressure to build up in the crankcase. This increased pressure can lead to oil leaks, gasket failures, or even engine seals blowing out. 2. **Poor Engine Performance:** When the PCV valve fails, it can disrupt the air-fuel mixture in the engine, leading to rough idling, stalling, or decreased fuel efficiency. This can result in a loss of power and overall poor engine performance. 3. **Contamination:** A faulty PCV valve may not properly route harmful gases, like unburned fuel and moisture, out of the crankcase. This can lead to contamination of the engine oil, reducing its effectiveness in lubricating engine components and potentially causing premature wear and damage. 4. **Increased Emissions:** A malfunctioning PCV valve can result in increased emissions from the vehicle, as it may not properly recirculate harmful gases back into the combustion chamber for burning. Overall, a nonfunctional PCV valve can negatively impact both the car's performance and the environment, potentially leading to costly repairs and increased pollution. Additionally, prolonged exposure to increased emissions from the vehicle can be harmful to both the environment and the health of individuals. Therefore, it's essential to regularly inspect and maintain the PCV valve to ensure proper functioning of the vehicle.
Engine, Mar 20, 2024
My Mercedes has a P052E check engine light code for its PCV value performance. I do see that many other drivers are having this issue and that repairs are around $2,000.
Engine, Feb 27, 2024
Check engine light P052E crankcase vent valve thousands of same model have this problem should be recall
Engine, Feb 25, 2024
I recently received a CEL code P052e positive crankcase ventilation valve. Common problem seen in multiple forums.