The contact owns a 2018 Mercedes-Benz GLA250. The contact stated while driving at various speeds and attempting to accelerate, the vehicle hesitated and jerked abnormally before accelerating. The contact stated that the failure also occurred while accelerating from the vehicle idling. The check engine warning light was illuminated. The vehicle was taken to the dealer who diagnosed that the crankcase vent valve had malfunctioned and caused the failure. The contact was informed that the crankcase vent valve needed to be replaced. The vehicle had not been repaired. The dealer confirmed that the VIN was not covered under warranty. The manufacturer was not made aware of the failure. The failure mileage was approximately 30,000.