Anecdotal story:
I took the plunge and bought a 2018 JL Wrangler Sahara Unlimited. Less than 50k miles. It was traded to a Philly Toyota dealer for a new Tacoma.
I got a great deal and drove away happy hoping to make some modifications for extra capability. After one day, the vehicle would not start. I checked all systems, both batteries, etc. All was fine. Tried to start again, then the dash lights started flashing and the engine came on without pushing the button. It ran horribly rough, so I shut it down.
Tried to give it a rest and restart. Nothing, just dash lights flashing. I shut it down and then as I walked away the lights started flashing and the wipers started going. With no key in the vehicle!
There was nothing I could do except let it drain the battery. Tried to restart with a jump pack. Nothing. No sign of life at all.
I informed the Toyota dealer and they said they would pay for having it taken to a Jeep dealer and that the initial warranty will cover everything. But I had to pay out of pocket to the Jeep dealer and the Toyota dealer insurance would cover it.
Had it flatbed to the nearest Jeep dealer who basically sat on it for almost a week (with me pestering) before finding the main fuse bus that protects the electrical system had blown. They found the part at another dealer and sent a driver to get it.
Two days later I had to call them to find out it that was the wrong part and they needed to order one. Nearly another week goes by, I have to chase them regularly.
So, they get the part and it comes to life. But the USB port backlights stay on when the vehicle is off. They wanted to do a parasitic loss test and ensure those lights would go out. They did......after an hour. They requested to keep it overnight. I agreed.
The next day, they did call me because the vehicle with no key in it turned on its headlights by itself. Dealer is baffled.
Now they call Stellantis engineering to figure this out. Their solution? Replace the entire dash display panel, which requires Stellantis to program my mileage into it. It should take less than a week, but could take 2 weeks.
Meanwhile, the service manager from the Toyota dealer calls everyday to ask for updates. I need to chase the Jeep dealer constantly.
What a great experience with my first FCA vehicle!!!!! I am up to $1200 out of pocket and drove it for one day.
Oh, sold my Ford Fusion Titanium AWD with 166,000 miles on it. It never saw a dealership. Just routine maintenance.
My 2004 Grand Cherokee WJ Overland with 90,000+ miles on it runs like a charm. Everything functions like it did 20 years ago.
The difference between Jeep of 2004 and Jeep of 2018 is light years.