2018 Jeep Grand Cherokee electrical system problems

The contact owned a 2018 Jeep Cherokee. The contact stated while at a complete stop at the traffic light, with the START/STOP mode engaged, the vehicle accelerated unintendedly and crashed into the rear of another vehicle. There were no warning lights illuminated. The air bags deployed. The contact stated that the forward collision automatic braking system failed to engage. The contact sustained back pain. The contact also sustained trauma and had been seeking assistance from a therapist.

After turning on the ignition and putting car into reverse the reverse light flashes and car will not go into reverse, same for putting into drive. Engine light stays on. This problem only lasts for a few seconds and then the car can go into reverse. I brought it into the dealer they had it for 4 days and could only recreate the problem once. It has happened to me twice prior to bringing it into the dealer. The dealer could not find any electrical or engine issues.