Home · 2026 Mercedes-benz GLC 300 4matic · Complaints

What 7 owners told NHTSA about the 2026 Mercedes-benz GLC 300 4matic

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (7)Crash / fire / injury (1)Electrical system (4)Engine (2)Backup camera & sensors (1)Body & structure (1)Brakes (1)Steering (1)Transmission & drivetrain (1)Wheels (1)

1 of 7 complaints match · Transmission & drivetrain · clear filters

Jan 16, 2026Transmission & drivetrainElectrical system

While at a stop with foot on brake, the vehicle surges forward powerfully making a loud noise despite having foot on brake. Forcefully pushing on brake pedal harder eventually stops the car. Most recent time the display screen showed "Transmission Deactivated". Dealership drove car once but did not perform service inspection. Dealership to pick up/tow vehicle for service inspection. This happened four times in the eight weeks since pick up of vehicle as brand new. This could have cause a crash or caused vehicle to strike an object or person. Vehicle accelerated on its own and was difficult to stop.

NHTSA ODI 11711555

Working with the data? Download all 7 complaints as CSV · fetched from NHTSA July 13, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2026 Mercedes-benz GLC 300 4matic verdict →