About 2 weeks after the extended warranty expired on my 2019 Cherokee I began to notice the Service 4 wheel drive message pop up on my dash. I took the vehicle to the dealership and was told that the PTU was faulty and that it would be $2200 to repair. As I could not afford it at that time I was advised that I could continue to drive without repair although I should not try to change traction modes on my vehicle. I have now gone nearly 3 years without repair and still very much feed that this is a defect that should be repaired by Jeep on all Cherokees that were manufactured around the same time as mine.