Power Train Problems of Mercedes Benz C300 - part 1

Rear subframe completely rusted out. While driving on the hwy I heard a loud noise, a couple minutes later I hit the brakes to slow down to get off my exit and after pressing the brakes the car instantly fishtailed sending me sideways across 2 lanes of traffic. Luckily no one was injured or killed. I’ve seen that the car manufacturer was replacing this issue on models 2008-2015. My vehicle is a 2015 and they are telling me my vehicle is not covered for the issue. The car is not drivable and mercedes needs to be held accountable. A critical component such as rear subframe completely rusting out in just under 10 years is unheard of and I can’t afford to pay 10k to fix it. Please help.

See all problems of the 2015 Mercedes Benz C300 🔎.

Rear-subframe corrosion at the lower-control-arm mounts has progressed to the point where both arms have play and produce loud metallic bangs while braking or turning at low speed. Two independent shops lifted the car, documented flaking rust around the bushing sleeves, and advised the subframe is structurally compromised and could let a control arm detach under load. The corroded subframe remains installed and can be inspected on request. Safety risk: a detached rear control arm would cause sudden, unpredictable steering and loss of control. The vehicle already pulls right under braking, and feels very unstable in curves problem has been reproduced and photographed by two independent repair facilities. No manufacturer representative has inspected the vehicle so far. Additional component failures possibly linked to the same progressive chassis stress: premature wear of both front cv axles; timing-chain stretch with worn guides; slack oil-pump chain; upper & lower oil-pan gasket leaks; water-pump seepage; right engine-mount collapse; persistent misfire traced to a loose intake-hose clamp; transmission-cooler hose clip released under pressure, dumping all atf and destroying the automatic transmission; excessive play in all four lower control-arm bushings. The transmission and the other components were replaced 1-2 months before the subframe bro history: a faint clank from the rear suspension first appeared roughly three years into ownership. Dealer service dismissed it as “normal noise,” and warranty would not cover “loud clanks,” so the issue went unaddressed. The noise has grown steadily into the current condition, suggesting long-term subframe corrosion that was never inspected or remediated. No collision, flood, or off-road use; the car has typical northeast winter-salt exposure. The failure pattern matches subframe-corrosion cases already acknowledged by the manufacturer on this model, although this serial number is not yet included in the official campaign.

I own a 2016 Mercedes Benz C300 4matic 44,000 miles and I started my car to pick my girlfriend up and 3-5 mins into the drive my check engine light popped up I went to get it scanned and code “p052e” came back, I did some research about the part and I come across a forum called mbworld and many others are having this same problem. I ask for a recall.

See all problems of the 2016 Mercedes Benz C300 🔎.

Failed piston wrist pins from early production of mercedes w205 C300. The issue was diagnosed by mercedes of manhattan and could not provide me a fix. Stated that the issue is common with the vehicle and it does not warrant a recall for this issue. I believe its a safety issue and my vehicle only has 60k miles.

My check engine light came on and I got it tested. The code came back as p052e. The power train system valve.

Pvc valve code. P052e mercedes should fix this!.

See all problems of the 2017 Mercedes Benz C300 🔎.

I drove my car to get lunch. Came back out to go back to work and the car would not start. Would not even turn over. My radio did not turn on and I couldn't even roll my windows back up. Luckily they were only cracked open a small amount. My steering wheel cannot be turned, it's locked in it's current position. I am told the esl (electronic steering lock) and possibly the eis is the cause of this problem. The display on the dash says "take your key from ignition" and that is all I get. Had to have my car towed and now I have a dead car with the windows partially open that I cannot close.

See all problems of the 2009 Mercedes Benz C300 🔎.

Purchased vehicle in March 2024 it went thru emission inspection in 2022 after failing it passed second time . I go for inspection and it fails emission test again just passed two years later. After doing my research positive crankcase ventilation system seems to be a very common problem. It also cost 2000 to fix. Appreciate you time thank you.

My wife was driving our 2020 Mercedes Benz C300 coupe near our house and the engine light came on. Then the car could not be driven over the speed of 30 miles per hour. Then it stopped and had to be towed. Fortunately, she was able to avoid being hit by other vehicles. The car only has 25219 miles. It was towed to a mechanic who performed a diagnostic test which provided a series of codes regarding the malfunction. Three codes were related to the camtronic camshaft system and its solenoid ( codes: p003c-53; p34ae-00; p34ad-09). Camshaft position actuators failure codes: p34ad; p34ae. The way it happened could have resulted in damage, serious injury or death since the car suddenly stopped. The car is well maintained. We believe that there is a manufacturer's defect since this is a garaged vehicle that is well maintained and has low mileage.

See all problems of the 2020 Mercedes Benz C300 🔎.

The panoramic sunroof is locked in an open position and will no longer close.

I need positive crankcase ventilation valve replace it's a common repair that comes up with these makes/models.

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.

On 2/17/24 the vehicle was parked in front of my house. There is a slight grade. The vehicle had been parked for approximately 1 hour when my neighbor called me to tell me that the vehicle had rolled down the hill and into his storage building. The vehicle rolled on its own. I have video evidence that no one was in or around the car at the time of this occurrence. I also, have 2 eyewitnesses who can corroborate this story. Due to safety concerns, I immediately returned the vehicle to mercedes. I have . Mov files and pictures jpeg that will not upload for some reason.

See all problems of the 2023 Mercedes Benz C300 🔎.

Vehicle sub-frame is cracked rusted corroded.

See all problems of the 2012 Mercedes Benz C300 🔎.

The contact owns a 2017 mercedes-benz C300. The contact stated that while at a stop light the vehicle stalled. There were no warning lights illuminated. The vehicle was taken to the local dealer where it was diagnsoed that the  battery cable needed to be replaced. The vehicle was repaired but the failure recurred. The vehicle was taken back to the local dealer where it was diagnosed that a update to the  powertrain software was needed and  and transmission pump be replaced.   the vehicle was repaired but the failure persisted. The contact called the local dealer who recommended that the transmission be replaced. The vehicle was not repaired. The manufacturer was contacted. The failure mileage was approximately 80,000.

Power train system - p052e positive crankcase ventilation regulator valve indicates a fault in the positive crankcase ventilation regulator valve. I repaired my car for the same issue in 2019 January and it failed again in 2024 January. It costs $2000 to repair and it has a warranty of two. It failed after 3 years. Same issue is occurring in mercedes C300 and glc 300 and multiple times. But company isnt taking any responsibility to fix the issue or at least extend the warranty. 1. Incident 1 - Jan 2019, miles 28k 2. Incident 2 - Jan 2024, miles 61k.

The esp®, or electronic stability control system can put the car into limp mode unexpectedly. Say you are driving on route 66 going 50 mph. The esp system can turn off if a wheel speed sensor or yaw sensor is on the way out. This causes the car to suddenly dramatically brake and limit speed to 5 mph on the highway. Risk of high speed rear end collision and mortality to the driver.

See all problems of the 2013 Mercedes Benz C300 🔎.

Positive crankcase ventilation.

Known/ common issue with the positive crankcase ventilation regularly valve on my 2015 C300.

Car check engine light came on with only 62,000 miles. Diagnosed as code p052e, the issue is the positive crankcase ventilation valve being faulty. Regular oil changes and maintenance was done. I see multiple complaints with this issue, why is this not recalled? it is very expensive to have fixed.

I was just driving normally boom engine light comes on take it to the dealership and it come up as crank case vent line which they quoted me 2300$. I think this should be recalled I have seen so many people with the same issue I have actually had someone tell me this was the only major problems with the w205 C300 before this happened. I think it should be recalled because from what I’ve seen it happens to every single C300 just at different mileages. Hopefully this will get a recall because it seems to be a very common issue and should be covered by the dealer.

Check engine light comes up. The crankcase ventilation has to be replaced. This is a well known defect in design by Mercedes Benz and there are hundreds of people who have had to replaced the crank case costing thousands of dollar to only have it happen again due to its faulty design. It’s well documented all over the internet.

Mercedes benz via american service center in arlington, va regarding the service they performed on my 2015 C300 w4 4door sedan awd the following issues have presented: issue: 03mbzzwarn1 engine light tech: 901844 problem: engine harness, engine control module, crankcase vent valve, and O2 sensor bank 1 cause: found oil in the engine harness and engine harness. Oil is entering threw [sic] the crank case vent valve. Recommend replacing. Approximate miles at the time of this issue: 63,141. Cost of repair: $8309. 58 yes, the vehicle is available for inspection. Safety concerns: the vehicle is not able to pass an emissions test with the engine light engaged. Per America service center in arlington, va, which is the only service center that has serviced the vehicle during my ownership, they commented and documented that oil is entering through a vent valve. My additional concerns are: if an odorless fume is passing into the passenger cabin and the vehicle can not pass state emissions these are immediate concerns. The service center advices that I may continue to drive the vehicle. However, I am concerned should the oil fully empty without warning the vehicle may fail while in use on a dangerous roadway due to cause and effect of additional unknown maintenance related operational CO-dependent mechanical components.

Pvc valve shouldn’t fail and each time it does it is around 2k dollars.

The left rear weld of the subframe on my 2012 C300 4matic has rotted through and appears to be a manufacture's part defect. I found out about this issue from a brake inspection and told it is a safety concern, which Mercedes Benzes is aware of but has no recalls for the defect.

Electronic steering locks are failing in these cars at an alarming rate. When it fails, the car will be stranded or if driving the car will completely lock the steering and take away control from the driver. This is a safety issue that mercedes should be recalling and fixing because it will take people's lives away. Mercedes is aware of this issue but is failing to recall it and considering it as non-safety. When manufacturing the electronic steering lock, mercedes used cheap parts that are prone to failure. This issue affected many years and models of their cars but only recalled a few cars. Once failure occurs, the car will not start and it will be required to tow it to a dealership where repairs over $2000 will be needed to fix this safety issue.

See all problems of the 2011 Mercedes Benz C300 🔎.

Error code p052e positive crankcase ventilation regulation valve performance.

See all problems of the 2018 Mercedes Benz C300 🔎.

The subframe has rotted from insufficient protection . This car is unsafe to drive , many us consumers having same problem with this model where the subframe is rusted out. This is a major issue effecting thousands of cars of this model or maybe more.

I have owned the vehicle for only about 4 months. My wife took the car out for a short errand and returned to tell me that the engine light was on. I took the vehicle to autozone and had the code ran on their diagnostic computer and it returned a p052e code for “positve crankcase ventilation regulation valve performance”. I have done a lot of research and have learned that this is a common problem and incurs huge financial impact to unsuspecting buyers. Mercedes has even made improvements to the part because of this issue. It’s not safe due to the possibility of oxygen build occurring in the combustion chamber. This part should be recalled and repaired by mercedes.

I purchased my 2017 C300 class mercedes-benz ("mb") in may 2021 from a used car dealership in mobile, al. At that time it had 36,000 miles. Less than 2 years later, on or about 12/15/22, as I was driving, the mb suddenly and without warning began to vibrate violently and immediately lost power. The car had @54,000 miles on it. I routinely drive interstate to and from work and had just gotten off of the interstate. I was lucky that I was driving at a low speed when this happened; otherwise, a serious accident could have resulted. I took it to the local mb dealership which told me that the car failed a compression test in the #1 cylinder and that the engine would have to be replaced. Subsequent research on the cause of this total engine failure with low mileage revealed that this engine has a chronic piston defect that damages the #1 cylinder, causing it to lose compression, and that mb has known about the defect for many years, an issued an internal bulletin about it. Mb has not alerted the public nor instigated a recall. I was not informed by mb at any time that the C300 class engine had a chronic piston defect that would damage the #1 cylinder which would, in turn, cause the engine to lose power and the vehicle to vibrate and shake, creating a dangerous diving condition under all circumstances, but especially if the car was being driven at speed on a federal interstate highway. Despite demands by me and others, mb refuses to responsibly address the issue. The driving public is, and remains, clearly, in great risk of harm due to this defective engine and associated power train issues. It is patently unreasonable for mb to produce and market such a unsafe, dangerous and defective product that poses an unreasonable risk of harm to its customersand others when being used as it was intended. I understand that the NHTSA has opened an investigation on this defect and wish for my voice to be heard on it. Please contact me [251-753-5182] for further details.

The subframe and the brake lines are very faulty in this car when it comes to its design. The subframe and brake lines rust easily and are cheaply made for this car. My car break down while driving making it hard to have pressure on the brakes. My incident was around the school area. There were no accidents or collisions involved. It could happen to adults and children. The dealer never confirmed this problem before selling it to me. Another manufacturer told me about this problem. The car showed warning signs like the braking system and brake fluid. The brake fuel was leaking. The problem appeared when I started the car.

Started smelling gas then check engine light came on took it to mercedes they did diagnostic which said low boost and that I needed to replace the turbocharger at a cost of over $7000.

I bought the car with 51k miles . Engine failed at 71k miles , due to piston #1 cracking . Almost caused me to get rear ended on a busy street . I went to the dealership and they charged me $10250 to replace the engine with a remanned long block and they offered a 2 year warranty. 9 months, only 19k miles on “new motor” the “new” engine fails again … same reason piston # 1 cracked failed suddenly on the highway and I had to push the car to safety to the emergency lane while cars where coming. . I went back to dealer demanding a replacement and told them this is a common occurrence and they refused to help me . I called corporate. They refused to help me saying I would have to purchase an engine for the second time out of pocket when it only lasted 9 months. This is a big fault in the m274 engine … it’s also a safety hazard that can cause serious injury, fire , or even a deadly accident. I read that it’s a common issue with these engines.

My engine failed at 82k odometer miles . Replaced it with a new engine for $10065 . And they said it was fixed and working normal , 2nd engine failed at 111000 miles . And has warranty. They refuse to fix it for a 3rd time . . . . . . This is a common problem with m274 engines. Please help us m274 engine owners. . . . Its a very widespread known problem. . .

My car threw the check engine code p052e, the issue is the positive crankcase ventilation valve being faulty. Incredibly common on this model and now failed on my car too at 60k miles. All maintenance was done up to this point with the dealer and at or before recommended intervals.