What 315 owners told NHTSA about the 2016 Mercedes-benz C-class Hybrid

A fuel smell can be detected at idle inside the vehicle and around the engine area. A recall for some VIN's of this model in this year was enacted but not this particular model. No visible fuel moisture can be detected. A repair facility stated it might be a faulty clamp on the return fuel line. The recall was for dirt on manufacturing between the fuel injectors/fuel rail. This is a safety / emissions problem that hopefully does not lead into a fire. No warning lights are present. This started about 2 months ago

NHTSA ODI 11506631

My check engine light came on at about 68,800 miles. The OBD code shows that I need the Positive Crankcase Ventilation valve replaced. The repair for this is approximately $2,300 and requires about six hours of shop labor, and the part costing over $425. I’ve never known a PCV replacement on any vehicle to be more than $60, with the part itself being about $10-$20. Most times, the part can be simply cleaned and replaced. This is very disappointing. Especially given that the engine design, just two years prior, would have been less than $200 for the same repair, with part costing about $60. The vehicle does not show any symptoms of the part being blocked, as indicated in the code. There is no hesitation, loss a power or decline in fuel efficiency. However, the engine light cannot be turned off until the part is replaced. I think that $2300 to replace a part on seven year old car, well under 100,000 miles is indicative of either poor design or predatory. Hopefully, something can been done to address this. Thank you!

NHTSA ODI 11505413

The contact owns a 2016 Mercedes-Benz C300. The contact stated that the sunroof failed to open. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was made aware of the failure and advised the contact to file a complaint with the NHTSA Hotline. The failure mileage was approximately 65,000.

NHTSA ODI 11505253

Strong smell of gasoline on a daily basis for 3 months. Took vehicle to mechanic's and was informed that the fuel lines were leaking. Was shown the cracked lines.

NHTSA ODI 11504955

Crankcase Ventilation Valve malfunction at under 50k. Check engine light is on and I took it into the shop after gas fumes were coming into the car through the ventilation system. I was informed that has been an ongoing issue with Mercedes and I was referred to fill out this document to try and kickstart a recall process. This is a problem that is very costly, and seemingly is happening to most recent models at around the 50k mark. Beyond that is is also a safety hazard as it is causing gas fumes to enter the cabin of the vehicle.

NHTSA ODI 11504641

code P052E on 71000 miles. The crankcase vent valve replacement.

NHTSA ODI 11503241

MY VEHICLE (2016 C-CLASS 300) HAS A STRONG GAS SMELL WHEN THE VEHICLE IS COLD AND IDLING. SEEMS LIKE IT'S COMMON PROBLEM IN W205 C300 CARS. TAKING TO THE DEALERSHIP FOR DIAGNOSTICS THERE IS A CLASS ACTION INVESTIGATION: HTTPS://WWW.SAUDERSCHELKOPF.COM/INVESTIGATIONS/AUTOMOTI VE/MERCEDES-C300-AND-GLA250- FUEL -SMELL-CLASS-ACTIONINVESTIGATION/ YOU CAN SEE MULTIPLE PEOPLE COMPLAINING ABOUT THE SAME FUEL LINES;

NHTSA ODI 11501900

The contact owns a 2016 Mercedes-Benz C300. The contact stated he noticed an abnormal fume odor entering through the air vents of the vehicle. The contact self-diagnosed the vehicle as having a fuel leak from the fuel pump. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 83,000.

NHTSA ODI 11500300

CEL on, P052e code for crankcase ventilation/PCV failure. Vehicle has about 55k miles. Extremely common failure on these vehicles at this mileage and expensive/complicated to repair. Will not pass state emissions because of this. Given extensive anecdotal evidence of the pervasiveness of this problem, recall should be issue.

NHTSA ODI 11500226

PCV regulator valve

NHTSA ODI 11499728

2016 MERCEDES BENZ C300. When I start the car , you smell gas inside and outside of the car. Also the fumes come the vent when the heat is turned on. I have approximately 69,700 miles on my car

NHTSA ODI 11498933

2016 MB C300 41000 miles. Check engine light went on. Autozone code reader said p052e positive crankcase ventilationregulation value performance.

NHTSA ODI 11498245

There is a strong fuel smells in the interior of my vehicle during a cold start of the vehicle, this is a 2016 Mercedes Benz C300, i called the Mercedes Benz customer service at 800-367-6372 and i was told my vehicle didn't qualify for a free repair. Thank you. Manuel

NHTSA ODI 11498260

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.

NHTSA ODI 11498292

Car smells like gasoline especially when the s/c or heater is in use.

NHTSA ODI 11498166

The contact called on behalf of her daughter who owned a 2016 Mercedes-Benz C300. The contact stated the vehicle had an abnormally strong fuel odor coming from the inside and outside of the vehicle. There were no warning lights illuminated. The contact had not taken the vehicle to the dealer. The vehicle had not been diagnosed or repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 72,000.

NHTSA ODI 11495110

Cylinder 1 misfire initially, after taking it to an independent shop it was a piston 1 failure and required the small block to be replaced at 80,000 miles with a cost of $7000.

NHTSA ODI 11495006

Car cabin continuously smells like gas after several repairs to the AC. AC was repaired because of mold issue a few months back, however, issues with the AC is always a problem with this car and model.

NHTSA ODI 11494520

The crank case ventilation valve is bad. This part should be easily changed but the dealer wants over $3000. Happened at 62,000 miles.

NHTSA ODI 11494627

The contact owns a 2016 Mercedes-Benz C300. The contact stated after starting the vehicle with the heater running, there was an abnormally strong gasoline odor coming from the vehicle. The vehicle was not diagnosed nor repaired. The manufacturer was not contacted or informed of the failure. The failure mileage was 90,000.

NHTSA ODI 11494456

the Burl wood trim panel on the interior doors are deteriorating , the drivers side panel is deteriorating to the point that it looks like acid is eating away at the material there is red markings showing .. i find this could be a safety hazard as it could eat away at the door itself. i have pictures of evidence. there was a recall on Mercedes E class during the same years i purchased my car, my car is the C-class which was not part of the recall, but falls into the same category as time frame of purchase. Mercedes told me to contact you. i look forward to your response as this is a safety concern thank you

NHTSA ODI 11493595

(P052e) positive crankcase ventilation regularly valve

NHTSA ODI 11493630

Horrible fuel smell coming through Air conditioning vents on cold start up. This presents a safety hazard as there is an obvious fuel leak on a still late model vehicle with no safety recall in sight.

NHTSA ODI 11490742

P052e positive crankcase ventilation

NHTSA ODI 11490360

Crankcase ventillation valve assembly needs replacement

NHTSA ODI 11489676