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Transmission and drivetrainPart report

2021 Mercedes-Benz GLC 300 Transmission and drivetrain Problems

Complaints
4about this part
Share
6%of 67 total for the year
Median mileage
—not reported
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 4 complaints about the transmission and drivetrain of the 2021 Mercedes-Benz GLC 300, 6% of the 67 complaints for this model year.

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.

“Vehicle Information: Year: 2021 Make: Mercedes-Benz Model: GLC 300 Engine: M264 Mileage at time of failure: Approximately 65,000 miles Complaint Description: While driving, my 2021 Mercedes-Benz GLC 300 began experiencing repeated engine misfires and rough running, accompanied by a persistent check engine light. These symptoms began shortly after I purchased the vehicle and progressively worsened over time. The vehicle exhibited reduced engine performance and hesitation while driving. …”

NHTSA complaint #11709709, filed 2026-01

“This is the 3rd incidence of this issue (July, Oct, Dec), but we have been advised that a software update is not yet available from the manufacturer. In all instances, we were travelling at a normal rate of in-city traffic (30-45 mph) and all of sudden the vehicle will not accelerate above 25 mph regardless of the position of the throttle. My dealer, Mercedes Benz of Tampa, advises that the problem can only be corrected permanently with a software update which is not yet available. …”

NHTSA complaint #11559715, filed 2023-12

“The vehicle is experiencing an intermittent, sudden, and life-threatening drop into limp home mode while driving, creating an severe speed differential with surrounding traffic.First Incident (50,584 miles): The vehicle entered limp mode. Authorized Mercedes service center scanned the car, confirming Fault Code P019185 (Rail pressure sensor malfunction / signal above permissible limit value). …”

NHTSA complaint #11760688, filed 2026-08

“The engine starts shaking, smell of gas car than stops while driving, could caused an accident and severely injured someone on the freeway. This is a major safety issue after further researching this particular issue MB of Canada issue a warranty letter extension for this particular but nothing for US.”

NHTSA complaint #11724468, filed 2026-03

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 2021 Mercedes-Benz GLC 300

Engine
30 complaintsExterior lighting
13 complaintsFuel system
12 complaintsElectrical system
8 complaintsOther or unknown
7 complaintsVisibility (wipers, defrost, mirrors)
4 complaintsBack-over prevention (rear camera)
3 complaintsForward collision avoidance
3 complaintsBody and structure
3 complaintsLane departure
2 complaintsVehicle speed control
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