2021 Mercedes-Benz GLC 300 Vehicle speed control Problems
- Complaints
- 2about this part
- Share
- 3%of 67 total for the year
- Median mileage
- 7,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 2 complaints about the vehicle speed control of the 2021 Mercedes-Benz GLC 300, 3% of the 67 complaints for this model year. Where a mileage was given, the median is 7,000 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.
“The contact owns a 2021 Mercedes-Benz GLC300. The contact stated while driving at various speeds, the vehicle hesitated to accelerate while the accelerator pedal was depressed. The contact stated there was no warning light illuminated. The vehicle was taken to a local dealer but was not diagnosed or repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 7,000.”
NHTSA complaint #11431621, filed 2021-09, 7,000 miles“Driving on I75 in Georgia using Distronic speed control. This system scans highway speed control signage and automatically adjusts the vehicle speed based on speed limit signs. Unfortunately the state of Georgia has deployed MINIMUM SPEED 40 signs alongside the highway that are identical in size and appearance to SPEED LIMIT signage. The next result is the car automatically dropping the current speed (say 70 mph) to 40mph with heart stopping effects, particularly in heavy traffic. Turning off the automatic speed control eliminates the problem. …”
NHTSA complaint #11469308, filed 2022-06Vehicle speed control: other model years
Other parts of the 2021 Mercedes-Benz GLC 300
30 complaintsExterior lighting
13 complaintsFuel system
12 complaintsElectrical system
8 complaintsOther or unknown
7 complaintsTransmission and drivetrain
4 complaintsVisibility (wipers, defrost, mirrors)
4 complaintsBack-over prevention (rear camera)
3 complaintsForward collision avoidance
3 complaintsBody and structure
3 complaintsLane departure
2 complaintsAir bags
1 complaints
← All problems reported for the 2021 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