2020 Mercedes-Benz GLC 300 Vehicle speed control Problems
- Complaints
- 2about this part
- Share
- 3%of 70 total for the year
- Median mileage
- 3,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 2 complaints about the vehicle speed control of the 2020 Mercedes-Benz GLC 300, 3% of the 70 complaints for this model year. Where a mileage was given, the median is 3,000 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.
“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 milesVehicle speed control: other model years
Other parts of the 2020 Mercedes-Benz GLC 300
22 complaintsOther or unknown
15 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 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