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Other or unknownPart report

2023 Mercedes-Benz GLC 300 Other or unknown Problems

Complaints
9about this part
Share
16%of 55 total for the year
Median mileage
400miles
Trend
Too newThis model year is less than 4 years old, so a trend is not meaningful yet.

NHTSA recorded 9 complaints about the other or unknown of the 2023 Mercedes-Benz GLC 300, 16% of the 55 complaints for this model year. Where a mileage was given, the median is 400 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.

“When working in the rear cargo area, the door comes down without warning and does not break when it meets resistance trapping me between the body of the car and the descending door. A great deal of physical pressure must be employed in trying to get it to reverse direction. It is a struggle to get out from under the continually closing door. This has happend to me on three different occasions. There should be an automatic reversal when the door meets resistance not unlike a garage door.”

NHTSA complaint #11591232, filed 2024-05

“The sunroof glass blasted and shattered during a drive on an interstate highway. I was driving normally when I heard a loud sound like a tire burst or gunshot. Initially, I thought that my tire had busted. I took an exit and stopped to inspect the tires. I found them to be okay, but I was puzzled where the sound came from. I started driving again and observed that a lot of outside noise was coming, also there was a glass clinking noise so I stopped again to check. I found a hole in my sunroof and the shattered glass had fallen on the protective mesh cloth. …”

NHTSA complaint #11629650, filed 2024-12

“I bought this car brand with 4800 miles directly from Mercedes a month ago. The check engine light has been on since the second week of ownership. The reason I’m submitting this report is because it’s been into warranty service 4 times. Each time Mercedes Benz says that it is a known issue affecting ALL GLC300 models. They also indicate that it is a software issue, but don’t have a patch for it. There are other things like Bluetooth, no radio audio, and the remote start that they are also attributing to this software glitch. However, the check engine light presents a MAJOR safety issue. …”

NHTSA complaint #11566824, filed 2024-01

“Unknown: Driving on Route I 71 south in Cincinnati going CVG to pick up wife. 60-70 MPH. All systems normal.Suddenly out of blue , Brakes slam on 3-3 seconds seatbelt locks on and car deaccelerates with no warning , no lights , no registered failure. Belt compression severe, almost brushing strength. My wife has a spinal injury, cage in her neck ., must wear brace . She was not driving, tell Chris Walker to have service pick up , take care of open recall, fix sudden development of violent sudden deceleration with Violent seat belt tensioner compression . Really catastrophic Situation. …”

NHTSA complaint #11551129, filed 2023-10

“Brand new car that had less than 1500 miles on it, one day went to start it while 20 miles away from home and error messages in dash and beeping 48V battery error, do not change transmission position, reduced functionality of driver assistance features...etc. and car would not start, could not turn steering wheel.”

NHTSA complaint #11538778, filed 2023-08

Related service bulletins

Other or unknown: other model years

YearComplaintsShare of year
2025319%
2024314%
2023916%
2022711%
2021710%
20201522%
20191532%
20182023%
20171313%
20162116%

Other parts of the 2023 Mercedes-Benz GLC 300

Electrical system
30 complaints
Engine
15 complaints
Exterior lighting
10 complaints
Forward collision avoidance
7 complaints
Lane departure
6 complaints
Brakes
5 complaints
Fuel system
5 complaints
Body and structure
4 complaints
Transmission and drivetrain
3 complaints
Steering
2 complaints
Vehicle speed control
1 complaints
Visibility (wipers, defrost, mirrors)
1 complaints

← All problems reported for the 2023 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