NHTSA complaint #11615485

Owner complaint summary

The contact's son owns a 2020 Mercedes-Benz GLC300. The contact stated that when the vehicle was taken for the State Emissions Inspection, the vehicle failed the inspection due to a defective "smoke cannister". The contact stated that after the vehicle failed the inspection, the "check emissions" message appeared on the instrument panel. The contact called a dealer and was advised to purchase and install the smoke cannister. The vehicle was taken to an independent mechanic who installed a new smoke canister; however, the failure reoccurred, and the vehicle failed the State Emissions Inspection test again. The vehicle was taken back to the dealer where the vehicle was diagnosed with a defective smoke canister and valve. The vehicle was not repaired. The manufacturer was informed of the failure. The failure mileage was unknown.