One problem related to automatic transmission gear indicator has been reported for the 2018 Jeep Wrangler. The most recently reported issues are listed below.
While starting the vehicle for the third time in two days after picking up the car following a pcm flash for a cruise control recall, I noticed the prnd lights flashing on the shiftier approximately 10 seconds after vehicle start. I subsequently received a cel and a "service shifter' message. I shut off the vehicle, let all displays go dark, and restarted; the cel went away. I proceeded to continue my drive home. About 10/15 min later, I noticed the lights flickering once again on the shifter. I once again elected to continue home as it was late at night. Approximately 2/3 miles later, I received errors on the start/stop and traction control systems. The vehicle appeared to go into a "limp mode" - I it would not shift out of 8th gear and I experienced reduced power and an inability to maintain the posted 70 mph. I decided to exit at the next off-ramp as I could maintain 65mph. While exiting, I noticed the gauge needles (speedo and tach) sweep and got airbag warnings. I heard the electric fan go 100% high (very loud) and I lost power steering. I pulled over to the side of the road and shut off the vehicle. After letting it sit for approximately 5 min, I restarted the vehicle and while the cel remained no other errors were illuminated or presented. I was less than 2 miles from a Jeep dealer and decided to try to continue there on access roads. About 1/8 mile down the road, I once again lost power steering and say various error messages like before. I pulled into a parking lot and aborted my attempts and called for a tow to the dealer less than a mile away. Posted are pictures of the errors read using an obd-2 scanner I had in the glove compartment. While I have driven cars without power steering in the past, it was rather difficult with the larger ~32" tires and I am not sure a crash could be prevented if a smaller person was driving.