2017 Mercedes-Benz GLC 300 Other or unknown Problems
- Complaints
- 13about this part
- Share
- 13%of 101 total for the year
- Median mileage
- 4,900miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 13 complaints about the other or unknown of the 2017 Mercedes-Benz GLC 300, 13% of the 101 complaints for this model year. Where a mileage was given, the median is 4,900 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Vehicle key-less entry locked out the driver and passenger with keys inside the vehicle while parked. Talked to other mercedes GLC300 owners and they are experiencing same issue. This happened late at night with my wife and 7 year old daughter in a high crime area while I was out of town. Mercedes roadside assistance charged us $99.95 to unlock vehicle. This is a life threatening defect and should be acknowledged and addressed by mercedes immediately.”
NHTSA complaint #11034325, filed 2017-10, 9,000 miles“While driving on the I-75 north, the sunroof exploded as indicated in the picture attached. It is still unclear if the sunroof shattering was from a stray rock on the highway, or if the sunroof exploded on its own, however my concern is how the sunroof shattered and the quality of the material/glass used. What type of glass is used in this vehicle for it to shatter as it did? Is this perhaps a sign of cheaper material being used on the sunroof. There are more pics than can show more of the damage.”
NHTSA complaint #11043584, filed 2017-11, 4,000 miles“While driving on the I-5 into downtown san diego we heard a loud bam, a moment later heard cracking then shattered glass from my sunroof fell into the car. There was no one directly around us.”
NHTSA complaint #11033826, filed 2017-10, 4,900 miles“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 complaint #11504950, filed 2023-02“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 complaint #11543342, filed 2023-09Related service bulletins
- 11035780Aug 4, 2026Complaint Mercedes-Benz USA is currently experiencing limited availability of transmission fluid specification ATF 236.17 due to a global supply constraint. 236.17 ATF 1L and 5L…
- 11028809Feb 13, 2026Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the TIREFIT sealant bottle may not meet specifications. The…
- 10238424Jun 9, 2023In the MBUX weather app, the temperature is displayed in the wrong unit (Fahrenheit instead of °C, or vice versa). Temperature setting in Mmc mobile application settings…
- 10187785Jan 4, 2021The following complaints may be noted by the customer: - The MBUX multimedia system (A26/17) starts route guidance without user input and does not provide any audio notification…
- 10179966Jul 31, 2020Incorrect time and/or instrument cluster message "SOS, service not activated" and/or Mercedes Me connect services nonfunctional
- 10205154Aug 5, 2016Gasket may settle causing a slight oil leak.
Other or unknown: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2025 | 3 | 19% |
| 2024 | 3 | 14% |
| 2023 | 9 | 16% |
| 2022 | 7 | 11% |
| 2021 | 7 | 10% |
| 2020 | 15 | 21% |
| 2019 | 15 | 32% |
| 2018 | 20 | 23% |
| 2017 | 13 | 13% |
| 2016 | 21 | 16% |
Other parts of the 2017 Mercedes-Benz GLC 300
37 complaintsFuel system
16 complaintsElectrical system
15 complaintsAir bags
11 complaintsSeat belts
8 complaintsVisibility (wipers, defrost, mirrors)
8 complaintsTransmission and drivetrain
7 complaintsBrakes
4 complaintsForward collision avoidance
4 complaintsSteering
4 complaintsTires
3 complaintsSeats
2 complaints
← All problems reported for the 2017 Mercedes-Benz GLC 300
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 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