2018 Jeep Grand Cherokee engine problems

The contact owns a 2018 Jeep Grand Cherokee. The contact stated that while driving for approximately 10-minutes, there was an abnormal knocking sound coming from the vehicle while depressing the accelerator pedal. The RPM lowered and the vehicle failed to respond while depressing the accelerator pedal. There was no warning light illuminated. The failure persisted, and the contact coasted into a parking lot and there was an excessive amount of yellow-grayish smoke coming from the engine compartment.

This vehicle lacks any kind of utility for positive engine shutoff confirmation, and/or a warning indicator when the key fob is separated from the vehicle. It is very easy to accidentally park and exit this vehicle and leave it running. It has happened to me four times in the 18 months that I've owned it. Two of these times the engine was left on while parked for more than an hour. This is obviously a huge safety and emissions issue.