The contact's client owns a 2021 Tesla Model Y. The contact stated while they were driving approximately 50-55 mph with the vehicle in self-drive mode, the vehicle veered to the left and crashed into a guard rail. There were no warning indicator lights illuminated. There were no reported injuries, air bag deployment, or fire. A police report was filed. The vehicle was towed to an unknown location. The contact called the local dealer but the vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was unknown.