One problem related to timing tensioner has been reported for the 2020 Jeep Wrangler. The most recently reported issues are listed below.
For the third time in six months, our 2020 wrangle unlimited has been at the dealer to attempt to fix a significant chirping sound coming from the serpentine area. They have already replaced the tensioner pulley twice and it's actually worse. So far, for the six months we've had it, we'll be going on 3 weeks in the shop. Initially it would only be on a cold start but now it's louder and we can't take it anywhere. The dealer has had all the tech look into it and they still believe it's related to the tensioner. It's not related to the recent tensioner recall either. This is a lemon and needs to be replaced.