100% it is not normal. Took me three dealership visits and finally a escalation through FCA to get a SRT mechanic/engineer guy from corporate to look at it and no BS tell me what it is.
In a nutshell...
The company that makes the PTU designed by Jeep engineers. Made to design specs, and those specs have very broad tolerances. The "click" is the sound of the PTU engaging and disengaging. (that's why it goes away in snow mode)
It is a QA/QC issue that FCA is totally aware of, they wont admit they designed a POS part. The company that made them, was the lowest bidder and made a few million of them. So it is cheaper to not do anything until the customer complains. But again (since Jeep never put out a TSB or SSB, the problem is non existent) When the PTU does fail. It's replaced under warranty and is a write off or cost applied to a GL code that is already budgeted for the issue.
So, with this information... I went at Jeep. Told them what I know and without a blink. They upped my Bumper to Bumper warranty to 8 years 120,000 miles. (I thought it was 100K, I jsut looked) this warranty is tied to the VIN so even if I sell it. The warranty goes with the Jeep.
It still makes the noise and will do so until it finally fails.