The contact owns a 2024 GMC Sierra 1500. The contact stated that while operating the vehicle, the automatic emergency braking system had malfunctioned and the vehicle did not stop when needed. The contact stated that while driving at a low rate of speed the collision avoidance system had activated, but the automatic emergency braking system did not activate, causing the vehicle to crash into the rear of a second vehicle. During the crash, no injuries were reported and no police report was taken. The cause of the failure was not determined. The local dealer was notified of the failure. The manufacturer was not notified of the failure. The failure mileage was 500.