The car was on enhanced auto pilot and was moving at about 50 mph, the traffic in front of me slowed down. The car failed to give an alert, it failed to slow down and stop. I applied the breaks, but by then the car crashed into the pick-up truck in front of me. The car came to a complete stop after the crash and the computer system in the car completely shut down. The car had to be towed to the garage. My safety and the safety of the driver in front of me were at risk due to malfunction of the enhanced auto pilot system We immediately filed a service ticket with Tesla and upon repeated requests we were told that car could not be inspected and the breaks or auto pilot system could not be tested as the car was not drivable. Police and car insurance company were notified. Tesla was able to provide us with a EDR There were no warning signs or messages prior to the malfunction.