The rearview camera and rear cross-traffic alert system in my vehicle failed to function while I was reversing. The camera screen went completely black, and the cross-traffic warning did not activate. Because I had no visibility behind the vehicle and received no alerts, I backed into a neighborâs mailbox post. The impact damaged my rear right turning lights and the mailbox post. These safety systems are critical for preventing collisions, and their unexpected failure created a significant safety risk to me and my neighbor. The vehicle is currently at the dealer for repair of the turn signal light. The dealer has not inspected the camera issue because the camera began working again after the incident, so the malfunction has not yet been reproduced or confirmed. No warning lights, messages, or symptoms appeared before the failure, and it occurred without any prior indication. The vehicle is available for inspection upon request.