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Transmission and drivetrainPart report

2017 Mercedes-Benz GLC 300 Transmission and drivetrain Problems

Complaints
7about this part
Share
7%of 101 total for the year
Median mileage
75,000miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 7 complaints about the transmission and drivetrain of the 2017 Mercedes-Benz GLC 300, 7% of the 101 complaints for this model year. Where a mileage was given, the median is 75,000 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 have experienced recurrent but intermittent issues with the transmission/acceleration of my mercedes glc 300 2017. Today, after I went up and then downhill, the car slowed dramatically on its own. When I pushed the gas pedal to the floor, the car did not respond immediately. After several seconds, the car started to accelerate. In the meantime, I was worried I would be rear-ended by traffic behind me. …”

NHTSA complaint #10971802, filed 2017-04, 7,500 miles

“No incident my vehicle has a front left malfunction service required light and issues with the passenger seatbelt not proper latching. Upon checking I notice my car had previous recalls done. It seems as if the same issues has come about. NHTSA: 18v177- seat belt not retracting properly. NHTSA: 17V627 is related to the steering column switch replacement of clock spring. So if me or a family member was to get into an accident no airbag will deploy! Huge safety hazard!”

NHTSA complaint #11664823, filed 2025-06

“The contact owns a 2017 Mercedes-Benz GLC300. The contact stated that while at a stop light, the vehicle independently shifted to neutral(N) for approximately 5 minutes. The vehicle failed to release from neutral when the driver shifted the gear shifter. The contact stated that the transmission then released from neutral(N), and the vehicle jolted forward. The check engine warning light was illuminated. The vehicle was taken to an independent mechanic, who was unable to determine the cause of the failure. The local dealer was not contacted. The vehicle was not diagnosed or repaired. …”

NHTSA complaint #11595449, filed 2024-06, 75,000 miles

“The contact owns a 2017 Mercedes-Benz GLC300. The contact stated while driving at an undisclosed speed, the accelerator pedal was depressed, however, the vehicle failed to accelerate as intended. In addition, the check engine warning light illuminated. The vehicle was taken to the dealer where it was diagnosed with a failed positive crank valve. The contact was informed that the positive crank valve needed to be replaced. In addition, the contact was informed that the repair was covered under an extended warranty program, however, the parts were on backorder. The vehicle was not repaired. …”

NHTSA complaint #11619914, filed 2024-10, 94,000 miles

“The Valve body control failed. I took the car into the dealership but upon doing some searching this seems to be a common issue amongst owners of this vehicle/make model. The transmission won't go beyond 5th gear (of 9) so it's is dangerous to drive on the interstate. The car doesn't shift into drive, only shifts into N, the reverts automatically to park. It required the engine shutting on/off multiple times and only then does it go into 3rd gear, causing the vehicle to jump due to missing gears. …”

NHTSA complaint #11680130, filed 2025-08

Related service bulletins

Transmission and drivetrain: other model years

YearComplaintsShare of year
2024524%
202335%
202247%
202146%
202046%
2019511%
201889%
201777%
201664%

Other parts of the 2017 Mercedes-Benz GLC 300

Engine
37 complaintsFuel system
16 complaintsElectrical system
15 complaintsOther or unknown
13 complaintsAir bags
11 complaintsSeat belts
8 complaintsVisibility (wipers, defrost, mirrors)
8 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 Nov 1, 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