What 115 owners told NHTSA about the 2017 Mercedes-benz Glc-class

Sunroof just exploded

NHTSA ODI 11585537

The contact owns a 2017 Mercedes-Benz GLC300. The contact stated that while driving at an undisclosed speed, the windshield wiper blades detached. The contact stated that the vehicle was purchased new in 2017. The contact stated that whenever it rained and the wipers were activated, the wiper blades would detach and flop over the front windshield. The contact stated that the vehicle had been taken to the dealer several times and the wiper blades had been replaced several times; however, the failure was persistent. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was made aware of the failure and a case was filed. The failure mileage was approximately 500.

NHTSA ODI 11578068

Error message of collision prevention assist inoperable. Mercedes dealer wants $400 to look at it only.

NHTSA ODI 11577867

Check Engine light came on. Mercedes Benz authorized service mechanic confirmed it is code P052E - Positive Crankcase Ventilation regulator valve issues that can cause engine to seize while driving. Vehicle has always been serviced regularly at authorized dealer service center. Current estimated Repair and replacement cost $9,700+ . Mercedes Benz authorized Service Center informed that the part is backordered and no estimated date available.

NHTSA ODI 11575152

Engine light. Told by Mercedes mechanic it is a code P052E - positive crankcase ventilation regulator valve issues that can cause engine to seize while driving. Repair cost $2,500+

NHTSA ODI 11574645

The last time I drove my vehicle was Monday [XXX] which that day it was raining. I covered my car with my car cover that day because I don't use my vehicle often and being that it was raining I covered it and my vehicle was fine on this day. On Monday [XXX] it was raining as well, I took off my car cover off and when we opened the trunk of the vehicle we noticed that the trunk was wet including the bag to my car cover. We also noticed from the trunk opening that the vehicle had some spots of mold and there was also mold spots on the back of the seat right side of vehicle. I had an appointment at Mercedes Benz dealership in Portland Oregon to change my transmission & engine oil. As I drove the vehicle to the dealership for my appointment my daughter and I noticed drops of water falling on us and we didn't have our windows open because it was raining. The water was coming from the sunroof area and the sunroof wasn't open. We kept driving until we got to the dealership and once we got there we noticed that the back seats were also wet and the right side back seat had a few spots of mold on the seatbelt. We left the vehicle at the dealership. Today Wednesday [XXX] the dealership is stating that because the sunroof is used so much the parts in that area due to wear and tear it's no longer working properly. They are charging my daughter 500.00 for a water test that they did to the top of the sunroof and for changing the seals the the sunroof and the back of the trunk they are charging I believe an additional 736.00. I feel that there is something wrong with the sunroof this vehicle. My daughter only drove it for about one year and in May 2018 I became the only driver of this vehicle and to be honest I don't even open the sunroof at all. The dealership is stating that it will cost approximately 15,000.00 to fix this problem and if not considering this vehicle a total loss. We are going to be contacting our insurance and see what happens. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI 11569161

Smell of gas

NHTSA ODI 11565695

After noticing my engine light come on, I had my vehicle checked out, the dealer informed (after spending $250.00) that the problem is the crankcase ventilation and it's a common problem. It seems the oh so familiar crankcase ventilation system is not working. This is a common problem with the GLC300 and Mercedes Benz needs to correct it. The engine is not being ventilated properly and the overwhelming smell of gasoline engulfs the interior of the vehicle. This is putting mine and the life of my family at risk, due to a faulty manufacturer issue. Mecedes Benz needs to obviously correct the faulty parts they use as soon as possible, before someone loses their life.

NHTSA ODI 11563324

The seat belt latch in the second seating row, the outboard seatbelt latch plate retracted into the area between the c-pillar paneling and the rear side paneling. The rear occupant was not be able to fasten the seat belt latch. The latch plate retracted behind the panel and the seat belt for the affected rear seat was not be available for fastening. I was able to grab the latch plate with a pliers and bring it out from behind the panel but I am afraid this situation will occur again. I checked my VIN against you checker and it says NO RECALL is pending. I assume MB did not include this VIN in its report to you or falsely claimed the vehicle was repaired. reference # 2018030012, May 2018

NHTSA ODI 11557169

Engine light - crankcase vent valve issue

NHTSA ODI 11549111

P052E code showing on the diagnostic machine. This is an issue with the positive crankcase ventilation regularly valve. I’ve read that this is a common issue with my vehicle that often happens after the warranty expires.

NHTSA ODI 11543342

The Positive Crankcase Ventillation harness fails and check engine light goes on. Through my research I found that many C class and GLC class with same engine have had similar issues and there was a recall and covered. My particular VIN was not included in the recall but had this check engine warning sign before 50K miles warranty expires. The light always went away but now it has come back on for the third time and not going away. The cost to replace this simple module is mostly labor at 8 hours is around $2,000. I believe this is an emission component and need to be covered under state and federal emission standards warranty. The initial recall with this issue should be involved with same engine and cover all cars and SUV's with same engine. I do believe this is an Emission control device that is regulated by state and federal standards and should be covered under warranty.

NHTSA ODI 11539238

Premature failure of the PCV assembly at 70,000 miles. Caused vehicle to turn off and sometimes engine to shake.

NHTSA ODI 11538409

The contact owns a 2017 Mercedes-Benz GLC300. The contact stated while activating the front windshield wipers, the wiper blades started scratching the front windshield. The vehicle was taken to the dealer and the front windshield was replaced. The contact stated that the failure occurred several times before the failure was corrected. On another occasion while entering the front driver side door, the contact became aware that the extended bar in the seat had protruded through the seat cover. The vehicle was taken to the dealer and the contact was informed that the front driver’s side seat needed to be replaced. The vehicle was repaired but the contact stated that the failure had occurred several times before the failure was corrected. On another occasion, the contact became aware that there was fluid leaking from the vehicle. The contact examined the vehicle and notice that the windshield washer fluid was leaking from the washer fluid reservoir. The vehicle was taken to an independent mechanic and was informed that the windshield washer fluid reservoir needed to be replaced. The contact was advised to contact the local dealer. The vehicle was taken to the dealer who stated that the vehicle needed to be diagnosed. The vehicle was not repaired. The manufacturer was contacted and referred the contact to the dealer. The failure mileage was 32,831.

NHTSA ODI 11537123

Positive crankcase ventilation system failure. P052e(77)

NHTSA ODI 11532016

CRANKCASE VENT VALVE PCV ENGINE LIGHT ON AIR POLLUTION DANGER STALLING DANGER

NHTSA ODI 11520804

Odometer reading more miles then driven (may have been tampered with altered) There is an electrical issue The computer required to be reprogrammed has not been done yet While driving the vehicle completely stop accelerating in the middle of traffic on the interstate placed my life in danger especially because traffic was moving rapidly the vehicle was jerking horribly also several codes came on when the service light came on also needed a pcp vale hose system they never repaired it i asked to have it repaired they agreed and then stated the vehicle had to many issues was sending to auction but yet reselling the vehicle still have not repaired completely this could be dangerous

NHTSA ODI 11520184

There are lots of 2017 GLC 300 that has been having issues with PCV system that are malfunctioning that could cause engine failure. Customers are forced to spend $2000 plus to have this fixed rather than Mercedes owning its problem and fixing it. For your reference please check glcforum.com where glc owners are ranting their issues with PCV systems. https://www.glcforums.com/threads/2019-glc300-4matic-pcv-code-crankcase-ventilation-oil-separator.7997/

NHTSA ODI 11519210

Intake and exhaust cam shaft and adjuster failure at 83,000 miles. Failure caused vehicle not to accelerate and stalled starts. Was on the highway when vehicle wouldn’t accelerate putting driver and others on road in danger. Repair on vehicle costing over $5k and MBUSA has no recourse due to vehicle being out of warranty. Per techs this issue should not happen to the engine.

NHTSA ODI 11518213

One morning I was driving the GLC-300 about 45 mph, when suddenly the car went from 45mph to 0 in 3 seconds. The car stopped and it would not move forward. The car was towed to the Mercedes Benz dealership and it was discovered that front differential was broken. The car has 55k original miles and it's maintained very well. There was no warming light on the dashboard to indicate this problem. If the car was traveling at speed of 55 or 65 mph, it could have caused a catastrophe. This is very unusual for front differential to break. This needs to be investigated by NHTSA and I'm sure there are other customer that run into this issue. Since the car out of manufacture warranty, Mercedes Benz covered the cost of the part, but I had to pay for the labor which was a lot. The dealership admitted that it was unusual for the front differential to break specially for Mercez Benz car.

NHTSA ODI 11515975

Collision prevention assist inoperative. Car at local Mercedes dealer. Told that a $317 software update was required to make system operative again. I do not understand how it is ethical for a corporation to alter their software, make a safety system inoperative, and the ask the customer to pay to make system operative again via a software update. This is unethical, a significant safety concern and just wrong. Thank you, [XXX] INFORMATION Redacted PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6).

NHTSA ODI 11508244

vent valve po52e71 - I have found thousands of the same issue with my car online. Mercedes covers this piece as an emission piece for Deisal Engine but not gas engines. This peice needs to be recalled and covered under emissions warranty asap.

NHTSA ODI 11504950

2017 Mercedes Benz GLC 300 Coupe 27,700 miles. I was driving on MD I-95 when the Power Steering Malfunction warning light came on and I lost power steering. I got off the next exit. Steering was very difficult especially when the car slowed. The Mercedes Benz dealer is replacing the electronic steering power control unit, power steering motor and steering rack. Cost $4910. Mercedes Benz has had GLC 300 recalls for Power Steering Malfunction but not for my model year.

NHTSA ODI 11500662

The Panoramic roof glass exploded suddenly. Throwing shattered glass pieces on the Highway and into the cabin of the car. No object or environmental conditions caused this incident. It just exploded while driving ~ 50mph

NHTSA ODI 11497913

With a low milage car receiving a P052E positive crankcase ventilation regulator valve performance issue.

NHTSA ODI 11492923