2020 Mercedes-Benz GLC 300 Other or unknown Problems
- Complaints
- 15about this part
- Share
- 21%of 70 total for the year
- Median mileage
- 3,000miles
- Trend
- RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.
NHTSA recorded 15 complaints about the other or unknown of the 2020 Mercedes-Benz GLC 300, 21% of the 70 complaints for this model year. Where a mileage was given, the median is 3,000 miles.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“The audible tic-tok sound of the turn signal is way too soft. The sound is supposed to give one notice that the turn signal is on. It simply isn't loud enough to provide that feedback. Consequently I often find that I'm driving down the street having completed a half-turn ( one where it doesn't trigger a shut off) with my turn signal on for blocks before I notice that the turn blinker is still on.”
NHTSA complaint #11385956, filed 2020-12, 500 miles“I was driving and stopped car to make a turn waiting for incoming traffic to clear. When I went to accelerate after traffic cleared, the car would not go above 0.5 miles per hour. I made sure the gear had not shifted to neutral, it was on comfort drive. I changed to sports drive and the car still would not accelerate above 0.5 miles. I was now stuck in the middle of intersection with incoming traffic, so I tried to reverse. The car reversed no faster than 0.5 miles per hour. I turned car off and back on, and acceleration then worked. Very scary. I was lucky incoming traffic avoided me. …”
NHTSA complaint #11413949, filed 2021-04, 3,000 miles“Received safety recall from mercedes benz (NHTSA recall #21v058) and have tried to schedule with dealer on several opportunities to get the repairs completed and they continue stating they cannot perform the recall repairs”
NHTSA complaint #11406769, filed 2021-04, 6,000 miles“I have received recall notice 3 months ago for software update. The update was supposed to happen over the air which it didn't. I need this update to finish asap because i need a recall clearance letter. This update took way too longer than it should have. Please solve this issue for me. Regards,”
NHTSA complaint #11435021, filed 2021-09“Dear Sirs: I own a 2020 GLC300W Mercedes SUV. As of this date, It has stalled 5 times while driving on the highway and on the roads within an 8 month period. Throughout this period, I have taken the vehicle to the Mercedes dealership in Riverside, CA three times to have this inspected. After their first inspection, the dealership claimed that the problem was due to a recall on a computer software update needed. However, the vehicle stalled two more times while driving on the highway. …”
NHTSA complaint #11651058, filed 2025-03Related 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…
- 11027782Jan 21, 2026Complaint The intent of this document is to provide workshops with helpful technical reference language. • Commonly used acronyms in LI's and TIPS cases. • Control unit names…
- 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…
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 2020 Mercedes-Benz GLC 300
22 complaintsBack-over prevention (rear camera)
7 complaintsElectrical system
6 complaintsForward collision avoidance
6 complaintsExterior lighting
5 complaintsSteering
5 complaintsFuel system
4 complaintsTransmission and drivetrain
4 complaintsBrakes
3 complaintsBody and structure
3 complaintsAir bags
2 complaintsVehicle speed control
2 complaints
← All problems reported for the 2020 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