The contact owns a 2023 Tesla Model Y. The contact stated while driving at an undisclosed speed with the full self-driving system activated, the message ‘System Malfunction — Take Over Immediately’ was displayed. There was no warning light illuminated. The vehicle was taken to the dealer, who was unable diagnose the vehicle or duplicate the failure. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 39,000.