2018 MERCEDES-BENZ GLC 300 Complaints

Mercedes Benz C300 P052E positive crankcase ventilation regulatory valve. Check engine light is on and the replacement is expensive. This is known issue, discussed in most MB forums. Please have it as manufacturers recall. By the time you come across this I may have already paid it some place to get it fixed... but want to help others. Thank you. [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

I brought my vehicle in to get serviced because the check engine light came on and I was told it was CODE PRESENT P0521E71 VALVE FOR CRANK CASE VENT. HAS MALFUNCTION / BLOCKED. I was told I have warranty on it so Mercedes of Massapequa took the car to fix.I was told the part was fixed but oil was found on my engine computer from the crank case vent malfunctioning but the warranty won't cover it although it was a direct result of a part that was covered part and had caused the damage.They gave me my car back and my car is worse it has problems starting it requires multiple cranks and the air conditioner has a fuel smell when turned on and I am unable to pass my vehicle inspection because my check engine light it still on.I spoke to the corporate office and they said because I have too many miles they can't do a courtesy and honor the cost and referred me back to the dealer and the dealer told me they will bring the cost to fix the computer leak to $6000 although it was due to a faulty part on their behalf .I am beyond upset my car is non longer reliable or safe to drive.Mercedes of massapequa ignored all my calls after they gave me back my vehicle that was worse after they claimed they fixed it.

The windshield washer pump failed due to the Sam unit. Failing I was in the mountains, started my car the windshield wiper malfunction light came on the wipers worked for a minute, so I turned them off, drove over the pass and tried to use my wipers, and they did not work. The back wipers did work. I took my car to my mechanic in Cheyenne, who discovered that’s the SAM unit Ruined the windshield washer pump. No one else has inspected it other than my mechanic. I have learned that there are others complaining of the same issue online. This is a dangerous issue when you are driving in a storm with no windshield wipers. My mechanic believes this should be a recall issue, and so do I. The Mercedes dealership said my mechanic, a faulty Sam unit to replace the Sam unit that went out. Now my car is throwing all kinds of codes and the back windshield wipers do not work.

My car is 6 years old and has done about 30000 miles. The amplifier in the car has failed, resulting in no volume for Radio, GPS , Bluetooth devices. This seems to be a common failure in the GLC 300 based on web search.

Car failed to accelerate due to faulty fuel pump, fuel tank, etc. Car stopped and died several times in the middle of heavy traffic. Mercedes Benz of West Houston, Sewell Dealership, has my car that was towed to them late afternoon on 3/5/2024. I have owned a Mercedes for over 40 years and never had this occur or be scared due to the car’s lack of performance.

I have had to replace the faulty pcv valve in my vehicle every 11 months since I have owned it. At over $1,000 a piece and with this being a well known problem with this make of vehicle the company needs to fix this problem. There are thousands of complaints online about this. Thank you for your time. Since this is an emission component the extended warranty will not cover it.

Rear seat belt latch plates (both driver and passenger side) retracted into the rear side paneling behind the seat. Both seat belts are now unusable. Issue occurred after rear seats were folded flat and then returned to upright position. Vehicle does not have dynamic locking tongue latch plates in the rear seats. MB dealership and MB customer care both claim that vehicle is not under NHTSA recall 18V-177 despite fitting the issue description, make & model, and production date.

Engine light error code P-052e71. The crankcase ventilation valve malfunction. This is reported by a lot of customers.. It cost about $2000 to fix this problem.

After seeing a warning light in my car's dashboard I took it in to be checked and learned the PCV intake hose had malfunctioned. This malfunction causes emissions dangerous to the environment and air quality. The condition was confirmed by an independent service center, a replacement PCV intake hose assembly ordered and installed. The warning light had been going on and off for a couple of months. When it stayed continuously on I took it in to be looked at. It was diagnosed and I had it repaired.

The contact owns a 2018 Mercedes-Benz GLC300. The contact stated that while driving at various speeds, the steering wheel malfunctioned, and became difficult to turn in either direction. The vehicle was taken to the local dealer who diagnosed that the electronic power steering module was faulty and needed to be replaced. The vehicle was not yet repaired. The manufacturer was notified of the failure, but no assistance was offered. The approximate failure mileage was 70,000.