The contact owned a 2024 Kia K5. The contact stated that while his son was driving at an undisclosed speed, another vehicle abruptly crossed into his lane. As a result, the contact's son collided with the rear of the other vehicle. Although equipped, the forward warning collision and automatic emergency braking systems failed to activate, which could have possibly prevented and/or lessened the severity of the collision. The air bags did deploy. No warning lights were illuminated. A police report was filed, and injuries were reported. The contact's son was transported to an area hospital by EMT and treated for a broken wrist. The vehicle was towed to a tow yard and deemed a total loss. The manufacturer was not notified of the failure. The failure mileage was 1,400.