2018 Mercedes-Benz GLC 300 Engine Problems
- Complaints
- 28about this part
- Share
- 32%of 87 total for the year
- Median mileage
- 6,000miles
- Trend
- RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.
NHTSA recorded 28 complaints about the engine of the 2018 Mercedes-Benz GLC 300, 32% of the 87 complaints for this model year. Where a mileage was given, the median is 6,000 miles. 1 a fire, according to the filers.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“'the first incident - occurred in august when I stopped at a stop-light. I started driving when the light turned green and the car was accelerating as normal. There were cars behind me accelerating as well as normal. My SUV automatically shifted from drive to neutral by itself as I continue to accelerate to move with the normal flow of traffic. The vehicle automatically slowed down to neutral '2nd incident - the same issue occurred again within two weeks I was driving on the long island expressway at approximately 40 miles per hour in heavy traffic which had commercial trucks. …”
NHTSA complaint #11140717, filed 2018-10, 6,000 miles“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.”
NHTSA complaint #11576098, filed 2024-03“I was driving when engine light came on.It then went into limp mode.The car would not accelerate we me trying to cross a busy 60mph road.I was almost killed.The code after it was tested p2138 .Pedal position sensor.This fault almost killed me....”
NHTSA complaint #11513104, filed 2023-03“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. …”
NHTSA complaint #11579424, filed 2024-03“I have engine light on and when I scanned it, I got a error code P052E For crankcase vent valve issues. It is most common problem with Mercedes-Benz Glc .”
NHTSA complaint #11630856, filed 2024-12Related service bulletins
- 11034064Jun 19, 2026Dear Mercedes-Benz USA Dealers, The part numbers listed in the chart below should no longer be installed, and any existing stock must be returned to your facing PDC. The deadline…
- 11018530May 15, 2025Complaint Check engine light illuminated Fault code stored in N3/10 control unit- P052E71 – Positive Crankcase Ventilation Regulator Valve Performance: The valve for crankcase…
- 11008712Oct 4, 2024Complaint Check engine light on. One of the below fault codes is current in the engine control module (N3/10). P04DB29, P04DB31, P04DB79 Cause Open circuit or high resistance to…
- 11031806Aug 9, 2024In our continuing efforts to assure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA (“MBUSA”) is extending…
- 11008064Aug 9, 2024In our continuing efforts to ensure the proper performance and quality of your vehicle, we are writing to inform you that on certain Model Year 2011-2018 C-Class, E-Class…
- 11031589Jul 9, 2024This NCU replaces the prior NCUs issued on August 25, 2023, August 31, 2023 respectively and, contains clarification on parts ordering.
- 11005276Jul 8, 2024Complaint Check engine light illuminated Fault code stored in N3/10 control unit- P052E71 – Positive Crankcase Ventilation Regulator Valve Performance: The valve for crankcase…
- 11000623May 14, 2024Complaint Check engine light illuminated Fault code stored in N3/10 control unit- P052E71 – Positive Crankcase Ventilation Regulator Valve Performance: The valve for crankcase…
- 10202522Jun 4, 2021Vehicle does not start after charging process
- 11031729Mar 20, 2019The purpose of this letter is to advise you of additional benefits that Mercedes-Benz is providing to you regarding your vehicle ownership.
Engine: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2025 | 3 | 19% |
| 2024 | 7 | 33% |
| 2023 | 15 | 27% |
| 2022 | 10 | 16% |
| 2021 | 30 | 45% |
| 2020 | 21 | 30% |
| 2019 | 11 | 23% |
| 2018 | 28 | 32% |
| 2017 | 37 | 37% |
| 2016 | 38 | 29% |
Other parts of the 2018 Mercedes-Benz GLC 300
20 complaintsElectrical system
13 complaintsBody and structure
9 complaintsSeat belts
8 complaintsTransmission and drivetrain
8 complaintsFuel system
7 complaintsAir bags
6 complaintsBrakes
5 complaintsForward collision avoidance
3 complaintsSteering
3 complaintsVehicle speed control
3 complaintsVisibility (wipers, defrost, mirrors)
3 complaints
← All problems reported for the 2018 Mercedes-Benz GLC 300
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology