2015 Mercedes-Benz C-Class
Problems, recalls and owner-reported issues
Engine is the leading concern among 449 owner complaints filed for this model year. This is the 7th highest complaint count among 23 C-Class model years with reports.
Of the 2015 reports, 11 involved a crash and 1 involved a fire. 10 people were injured.
What owners report most often
Recalls and investigations
No safety recalls on file.
Representative owner complaints
449 reports, newest first.
Lane departure, Aug 10, 2023
Blind Spot Assis Inoperative. This message appears on dashboard showing the malfunction of the blind spot sensors. This always happen when the weather temp is hot and also while driving during rain. This concern is putting me, my wife and kids in high risk and unsafe driving condition. I did some research and found out that the manufacture of this car put these electronic sensors inside the rear bumper behind both rear wheels and are exposed so whenever driving, rain, dirt, salt and all road debris splash all over these electronic sensor causing them to corrode and destroyed as a result of water and salt getting inside these fragile electronic sensors and then, the whole blind spot system inoperative and of course high risk to get involved into an accident.
Structure, Aug 8, 2023
The contact owns a 2015 Mercedes-Benz C300. The contact stated while driving at approximately 65 MPH, she heard a rushing air sound as if the sunroof was opened; however, the sunroof was not open. The contact stated that when she reached her destination, she noticed there was a panel missing from the roof between the sunroof and the windshield. The contact had not taken the vehicle to a local dealer or independent mechanic. The vehicle had not been diagnosed or repaired. The manufacturer had been informed of the failure. The contact researched online and related the failure to NHTSA Campaign Number: 21V197000 (Structure). The failure mileage was approximately 100,000.
Structure, Aug 7, 2023
The contact owns a 2015 Mercedes-Benz C300. The contact stated while driving 60 MPH, there was an abnormal wind sound coming into the vehicle. After a visual inspection, the contact noticed that the glass was detaching from the panoramic sunroof. The vehicle was towed to the dealer, who determined a failure with the adhesive. The vehicle was not repaired. The contact related the failure to NHTSA Campaign Number: 21V197000 (Structure) however, the VIN was not included. The manufacturer was notified of the failure but referred the contact to the NHTSA Hotline for assistance. The failure mileage was 51,150.
Engine, Fuel/propulsion system, Jul 25, 2023
Just got my car from the mechanic on 7/21/23 and it through an error code as I drove home. Towed back snd mechanic stated I need to replace the crank case vent valve assembly. Further stated that they keep in stock because it happens often. Error code P2188
Engine, Jul 25, 2023
Engine crankcase vent valve failure. common issue with these vehicles. can cause fire
Engine, Forward collision avoidance, Jul 18, 2023
Engine Crankcase (pcv) Problems on Mercedes Benz C300 and harness issue. I’ve noticed this is a very common issue many owners as myself have experienced and no action for a recall.
Structure, Jul 17, 2023
While driving on highway a load noise was heard pulled off the road to see what it was and the part of the sunroof that meets the windshield had raised up so we tried to push it down and continue towards home the car had to be driven at around 40 miles per hour to keep it from elevating and in fear that it might come off and hit someone's car or cause an accident
Engine, Jul 14, 2023
I have 65000 miles on my car. It is 2015 Mercedes C300. My Engine light came on. Found out that Crankcase Vent Valve needed to be replaced. Cost me 1200 dollars. It appears that lot of Mercedes C series cars have the same problem. I feel that Mercedes should pay for it.
Power train, Jul 10, 2023
My car is the 2015 Mercedes- benz (MB) c 300 4MATIC. The Check engine light is on and off for some months as initially MB dealer said that it's likely due to gas cap defects so we replaced the gas cap. After that, the engine light is still on and off. MB dealer now said $1,760 to replace crankcase vent value and $2870.55 to repair the front differential leaking/reseal. It will cost me a total of $ 4630.55 +tax to repair. The car has only 70,000 miles and kept good maintenance frequently. Right now my car is not safe to drive it so why this car is broke down so quickly. That is not acceptable to us.
Engine, Jul 1, 2023
Engine check light code: P052E Crankcase Ventilator / oil separator. Huge problem could cause the engine to stall while driving. Could lead to an accident if you are trying to merge on the highway and the engine stalls out.
Suspension, Engine, Forward collision avoidance, Jun 28, 2023
Mercedes 2015 C300 crank case ventilation hose has a defect and it is well-known to the manufacturer. This causes recurring engine and exhaust problems for a large number of car owners, and it should be part of a recall.
Visibility/wiper, Jun 23, 2023
During a drive, I had the sunroof opened and then it suddenly started raining. When I tried to close the sunroof using the button, it wouldn't budge. I had to continue driving on the highway with rain pouring inside the vehicle. When I finally found a place to stop and check the sunroof, I saw that the roof on one side was popped off. After a few minutes of trying to close it, it finally popped back into place on its own. However, now there is a rattling sound coming from the sunroof when driving, and the car is no longer quiet. I can hear outside noise as if a window is cracked opened. Every time the sunroof opens and close there’s a slight popping sound on that side and looks like it is still out of place.
Other or unspecified, Engine, Jun 22, 2023
My 2015 Mercedes c300 only has 39k miles and suddenly the engine light on, when I check, the dealer it shows that I need Positive Crankcase ventilation valve replace. it cost $2300. This is basically a brand new car and needing this repair every 30k is a joke please issue a recall and have Mercedes held responsible
Air bags, Jun 15, 2023
The contact owns a 2015 Mercedes-Benz C300. The contact stated while starting the vehicle, the front driver’s side air bag warning light illuminated. The vehicle was taken to the dealer and the mechanic stated that the vehicle had experienced the failure listed in NHTSA Campaign Number: 16V081000 (Air Bags) however, the VIN was not included. The vehicle was not repaired. The manufacturer was contacted, and a case was filed. The failure mileage was 50,000.
Power train, Engine, Fuel/propulsion system, May 26, 2023
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.
Engine, May 7, 2023
Crank case breather assembly needed replacement at 31,200 miles. Service mech. Advised the leaking area (oil) could not be repaired since Mercedes does not sell replacement parts and entire assembly needs to be replaced. March advised Mercedes is aware of issue and has redesigned the entire assembly. Cost for part was $400+ and labor to install was $1000. This issue is common as seen on internet and should warrant a recall refund to customers.
Engine, May 5, 2023
Positive Crankcase Valve faulty causing car to buck during moderate acceleration especially when accelerating onto an interstate on an on ramp.
Steering, Apr 27, 2023
The contact owns a 2015 Mercedes-Benz C300. The contact stated while driving 65 MPH, the power steering assist warning light illuminated, and the steering wheel became firm. The contact was able to pull over safely on the side of the road. The vehicle was towed to the dealer and the dealer stated that steering column was experiencing an electric failure, and that the rack and pinon needed to be replaced, and the steering module needed to be reprogramed. The vehicle was not repaired. The manufacturer was contacted, and the manufacturer stated that the VIN was not under any recall. No further assistance was provided. The failure mileage was 100,000.
Other or unspecified, Structure, Apr 22, 2023
FRONT STATIONERY PANEL FAIL OFF WHOLE DRIVING I SEE IT IS IN RECALL BUT DO NOT SEE MY VIN HOW CAN I GET THIS FIXED PER RECALL
Structure, Apr 10, 2023
The contact owns a 2015 Mercedes-Benz C300. The contact stated while driving 45 MPH, the roof carriage started shuddering. The contact veered to the side of the road. Upon inspecting the vehicle, the contact noticed that the roof panel had loosened. The contact stated continued driving and the roof panel fractured and partially separated from the vehicle. The vehicle was taken to an auto glass repair shop, where the roof panel was replaced; however, the failure reoccurred. The vehicle was taken back to the same auto glass repair center. The contact then became aware of NHTSA Campaign Number: 21V197000 (Structure) that he related to the failure. The dealer and the manufacturer were notified of the failure and informed the contact that the VIN was not included in the recall. The vehicle was not repaired. The failure mileage was approximately 85,000.
Engine, Mar 31, 2023
My vehicle is a 2015 C300 AWD. One day I was driving on the highway and noticed white smoke coming out of the exhaust. The check engine light came on shortly after as I pulled over. Being that I was less than a mile from my house, I decided to go park the vehicle. I noticed that it was losing power and had problems going above 45mph. Since my vehicle had 99k miles. I took it to my indy mechanic that has worked on the vehicle since it has been out of warranty. When he diagnosed the vehicle, 48 codes came up. He suggested we change the spark plugs and coils, which we did. Didn't fix the problem. Then he suggested we change fuel injector 1, which we did. That didn't solve the problem. I decided to take it to the local Mercedes dealership where they did another diagnostic test. And like many others here, cracked piston/cylinder 1 dead. I'm looking at $18,000 in repairs. I told them no thank you. The car is now sitting in my garage. I really hope Mercedes makes this right with its customers. There is no reason why this many people should be having this exact same problem. Vehicle Symptoms: White smoke out of exhaust Check engine light on Cylinder 1 Misfire Burning Oil Causing loss of power Radio randomly shuts off & went into Anti Theft Mode
Engine, Fuel/propulsion system, Mar 30, 2023
2015 C300 Crankcase Ventilation Valve Replacement P052E71 NEED TO BE REPLACED, ENGINE LIGHT COMES ON. ONLY HAVE 37,000 MILES MANY REPORTS OF THIS ISSUE
Engine, Mar 27, 2023
my car is a 2015 C300 class Mercedes-Benz, as I was driving, the car suddenly and without warning began to vibrate and shake violently and immediately lost power. Fortunately I was off the freeway, a serious accident could have resulted. I took it to the the local MB dealership and they told me that the car failed a compression test in the #1 cylinder and that the engine would have to be replaced at almost $17000. Of course, this was beyond warranty, Mercedes know it’s a defective product, they refused to act responsibly. This cracked piston which is a design flaw by Mercedes needs to be recalled, a lot of people are reporting the same issue.
Power train, Mar 27, 2023
PVC valve shouldn’t fail and each time it does it is around 2k dollars.
Engine, Mar 26, 2023
The problem is actually a manufacturing defect in the wrist pins. The defective parts are in engines made before April 20, 2015 which is mine. If left unrepaired, it causes premature wear in the cylinder walls. The issue on my car been confirmed by mb dealer.