What 251 owners told NHTSA about the 2017 Mercedes-benz C-class Hybrid

Most M274 engines have P06DA00 fault code internally. Harness for oil pressure regulating solenoid valve is short/open inside the engine oil pan. It can cause excessive oil pressure and premature oil pump failure. As the broken wire is sunken in the engine oil, I worry if it can cause fire. If the oil pump fair during driving prematurely, engine can be stalled. Mercedes-Benz knew the issue but they decided to ignore it.

NHTSA ODI 11497145

Crankcase Breather System: Vent Valve Fault code stored for block crankcase breather valve. The fault code is 052E71. A lot of Mercedes cars are reporting it online and no recall has been made. The labor to change this takes around 8-9 hours and the part costs 300. Company is doing nothing about it as a lot of W205 engines are having this issue

NHTSA ODI 11492970

I was reversing my vehicle when I heard a snap, and the inside dash panel warning sign came on…later I google it and found out it has happened to many other people. the clock spring behind the steering wheel snapped and airbags warning signs came on with possibility of deploying at any moment.

NHTSA ODI 11492300

The contact owns 2017 Mercedes-Benz C300. The contact stated while driving 45 MPH, he heard air coming in through the OSI cover. Once the contact arrived at his destination, he noticed that the front sunroof panel had detached from the vehicle. The dealer was contacted and stated that the vehicle was not under warranty and that the vehicle was already repaired under NHTSA Campaign Number: 21V197000 (Structure). The manufacturer was contacted and stated that the vehicle was not under warranty and that the dealer was not obligated to repair the vehicle free of changer. The failure mileage was 40,000.

NHTSA ODI 11491370

ode P052E : Positive Crankcase Ventilation Regulator Valve Performance. This seems to be a common problem with the C300.It's not an easy fix. MB hasn't addressed this common issue. Also strong smell of gas coming into the cabin during start up. Took car to Keys Van Nuys Mercedes in North Hollywood and was no recall. We are inhaling these fumes and they blamed it on a hose that expands and fumes escape into the cabin. Wanted to charge for the repair but I refused.

NHTSA ODI 11490718

When I started my car, the dash did not reveal park, drive, or reverse. It illuminated with a warning light indicating an Electronic Stability Problem (ESP). Research revealed this to be an important safety feature and that the Mercedes-warning-lights-electric-stability-control may have problems with traction control requiring attention. The ESP light was NOT flashing for the system to intervene – as the car was parked in my garage. It did not light up with the word ‘OFF’ to assess whether it may have been inadvertently deactivated. The light stayed on indicating a suddenly improperly working ESP system. The light remained on after stopping and restarting the engine several times as the dealer maintenance technician suggested concluding with my vehicle being towed to Mercedes Benz of Augusta for service. I am not sure if the MB mechanic reproduced the issue as they discussed several other potential failure points before resolving to replace an item in the steering control module. Experiencing this alert, I became more concerned that a safety inspection may not have been part of the last maintenance service. This is my third Mercedes and I make sure to keep up with all my maintenance. I had never seen this warning light before. Up until this time the only warning light I had seen in my car was for low air in my tires. My safety was not at immediate risk. I am glad my car was not able to be driven, as I would have hated for it to stop while I was out and about. I am a proud Mercedes Benz owner as they are world renown for the safest cars on the road. My car has just over 25,000 miles and it was unimaginable that it would have this kind of failure. I should not be held accountable to pay for a safety failure that I should be part of required maintenance checks. An additional periodic Mercedes required safety inspection could prevent this potential breakdown while providing another measure to protect the life of Mercedes Benz owners.

NHTSA ODI 11490679

Check engine light. Code: P052E, positive crankcase ventilation regulation performance.

NHTSA ODI 11488628

Engine bay gets too much water whenever car wash has been done due to space between windshield and plastic engine bay shield (right hand side from vehicle driver seat) has slight gap.

NHTSA ODI 11488651

The contact owns a 2017 Mercedes-Benz C300. The contact stated while driving 45-50 MPH, the vehicle stalled inadvertently and would not exceed 3 MPH. There was no warning light illuminated. The contact was unable to veer to the side of the roadway. The contact turned on the hazard lights. The contact turned off and restarted the vehicle however, the vehicle would not exceed 5 MPH and was making abnormal sounds. The contact veered to the side of the road for approximately 4 hours until there was no longer traffic on the roadway. The contact proceeded to drive at 5 MPH to her residence less than two miles away. The manufacturer was notified of the failure and assisted with towing the vehicle to the dealer to be diagnosed. The contact was informed that the piston rings had blown out and the engine needed to be replaced. The manufacturer informed the contact that the failure was a known failure; however, she would be responsible of the cost of the repair. The vehicle was not repaired. The failure mileage was approximately 29,650.

NHTSA ODI 11488094

Please see attached letter: [XXX] Mercedes Benz Crankcase Valve Claim.pdf, repair estimate and other correspondence from Mercedes-Benz. This is an well-known issue where there is a gas lead from the engine where Mercedes insists doesn't pose a safety issue. During cold starts there is a smell of gas in the cabin and this is prevalent in colder climates like New England. Mercedes should make cars for all markets that are safe. INFORMATION Redacted PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6).

NHTSA ODI 11484931

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.

NHTSA ODI 11482918

My car leaked oil very fast while me & my wife were on a trip and it stopped on the highway and engine was stalling and misfiring due to a manufacture defect that is common with this model so it did put us in a very dangerous & risky situation. Now after i paid $1,740 the dealer is saying that my car needs a new engine due to cracked piston in cylinder 1 that damaged the engine which is a common problem with this model around the 50k miles.

NHTSA ODI 11482136

The contact owns a 2017 Mercedes-Benz C300. The contact stated that she heard air entering the sunroof however, while attempting to close the sunroof, the sunroof failed to close as designed. There was no warning light illuminated. The vehicle was taken to the dealer however, the contact was unsure of the diagnostic result. The vehicle was not repaired. The manufacturer was notified of the failure and the contact was informed of a program that was cost effective. The contact was referred to the NHTSA Hotline. The failure mileage was approximately 56,000.

NHTSA ODI 11481158

There is an existing recall (21V197000) from Mercedes regarding defective glue attaching the roof panel to the car. The roof panel can dislodge and fly off the car, creating a road hazard. I have the same issue on my 2017 C300 where the panel has moved, causing a whistling noise. The deal has diagnosed this issue. However, my VIN is not covered by the Mercedes recall. I have reached out to Mercedes, and they refuse to include my vehicle in the recall. Other 2017 C300 models are included. I believe their recall does not cover all affected vehicles. The recall number is 21V197000.

NHTSA ODI 11481155

The contact owns a 2017 Mercedes-Benz C300. The contact stated the seat belt retraction failed. The contact stated the seat belt got stuck between the driver's door and the vehicle and she was unable to open the vehicle, so contacted the manufacturer's roadside service for assistance. The roadside service unjammed the door. The contact was unaware of the warning lights illuminated. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The contact related the failure to NHTSA Campaign Number 21V032000 (Seat Belts). The approximate failure mileage was 1,000.

NHTSA ODI 11478823

The contact owns a 2017 Mercedes-Benz C300. The contact stated that while driving at various speeds and attempting to make a turn, the steering wheel was significantly difficult to turn. The contact stated that he was able to drive the vehicle however, an extra effort was needed to steer the vehicle. The contact stated that the failure had been reoccurring while driving. The vehicle was taken to the local Pep Boys who informed the contact that they could not duplicate the failure. The contact referenced NHTSA Campaign Number: 18V850000 (Steering). The dealer was not notified of the failure. The vehicle was not diagnosed nor repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA for assistance. The failure mileage was approximately 65,000.

NHTSA ODI 11477465

My check engine light keeps jumping off and on, went to get diagnosed and the PCV valve came back. I’m not sure why

NHTSA ODI 11473703

Issue: Front driver and passenger seat belts do not fully retract despite completed recall service. The seatbelts often "puddle" behind the seats when unbuckled, and sometimes get trapped between their seat and adjacent door. My car was recalled and serviced under Mercedes Campaign 2021020010 to fix this in October 2021. Also, the right front seatbelt was replaced in October, 2018 under Campaign 2017050023. The first paragraph of the Mercedes Recall Campaign Bulletin states, "...certain C-Class Cabriolet vehicles (A205 platform) with PRE-SAFE might not meet the requirements of FMVSS 208, S7.4.5., as the front seat belts might not fully retract to its stowed position. In this case, certain regulatory requirements under FMVSS 208 might not be fulfilled. If the seatbelt webbing does not fully retract into its stowed position, the consumer may find the operation of the seatbelt inconvenient and not wear it, increasing the risk of injury in the event of a crash." In its step 1, the bulletin states, "The seat belt strap must retract into its final position automatically. Provide manual assistance with rolling up the seat belt strap if necessary." Having to provide manual assistance to retract the seat belt does not meet the definition of "must retract into its final position automatically". Further, it does not meet the aim stated in the bulletin's first paragraph about the importance of the seat belt fully retracting. The labor time spent on campaign was only 0.10 hours (6 minutes), so nothing more than a cursory inspection was done, and not any actual service work. I spoke with my local Mercedes dealer and the Mercedes USA customer service rep. They are both Ok with manually feeding the seatbelt into its slot. This is unacceptable and does not meet FMVSS 208. Both the dealer and the Mercedes USA say I can pursue proper fix at my expense. This is a failed recall service and I should not have to pay to explore a proper remedy.

NHTSA ODI 11472915

Diagnosis code P052E PCV regulator valve replacement/crankcase replacement. Dealership does not want to acknowledge code while car was under warranty despite proof that it existed when check engine was diagnosed. Now code keeps coming back with check engine light on dashboard. To replace part, the engine has to be taken down since the crankcase is inside the engine. This is a malfunction during assembly/manufacturing, it is impossible to damage part while under usage. Mercedes Benz should be held responsible for part replacement and labor. I urge you to investigate this matter with other clients and ask the manufacturer to replace part and pay for labor.

NHTSA ODI 11471458

The contact owns a 2017 Mercedes Benz C300. The contact stated while driving at a slow speed in traffic, another vehicle rear-ended and caused her to crash into the vehicle in front. The air bags did not deploy. The contact sustained injuries to the back of her head, her left shoulder, right wrist, and right arm along with chest pains and facial contusion. The contact sought medical attention at an emergency room. A police report was filed. The vehicle was not drivable. The contact towed the vehicle to her residence. The vehicle was not diagnosed or repaired. A dealer was not contacted. The manufacturer had not been informed of the failure. The failure mileage was approximately 57,000.

NHTSA ODI 11469189

misfire cylinder 1 46300 miles on the engine.Mercedes dealer told me I need new engine and they are not providing warranty coverage.

NHTSA ODI 11467297

Check engine light came on, took it to the dealership. It is the Crankcase Ventilation Valve that is once again broken. It helps to accurately depict emissions. It is a known problem that hundreds of other drivers are reporting on forums https://www.benzworld.org/threads/2015-c300-crankcase-ventilation-valve-replacement-p052e71.3047538/page-1 https://mbworld.org/forums/c-class-w205/739851-check-engine-code-p052e.html There needs to be a recall, this is a consumer protection and environmental safety issue.

NHTSA ODI 11467410

The contact owns a 2017 Mercedes-Benz C43 AMG. The vehicle had previously been serviced under NHTSA Campaign Number: 21V197000 (Structure). The contact stated while driving 60 MPH, the sunroof glass was rattling. The contact pulled off the exit to check the sunroof. The vehicle was not diagnosed nor repaired by an independent mechanic or dealer. The manufacturer was made aware of the failure, and the contact was awaiting a callback. The failure mileage was approximately 85,000.

NHTSA ODI 11466273

CODE PO052E71 crankcase vent solenoid causing check engine light

NHTSA ODI 11464414

P06DA00 CODE oil pump vale circuit open

NHTSA ODI 11464415