When I first bought my jku there was few problems.
1- driver side squeak or creek .
Fixed by loosening the roll bar bolts on the windshield frame and drive the jeep to flat surface and tightened them.
2- ODO button was not working.
Fixed by reconnecting the connector
3- clunky steering.
Fixed by putting the steering bushing together I mean the on in the firewall.
And tightened the shaft u-joints.
4- battery drain.
Fixed by replacing the old battery.
5- Engine slight overheat.
Fixed by : found the fan connector disconnected and when connected fan won't stop
So I replaced booth low and high speed fan relays.
Problems not solved yet
1- TC shudder at 1400 rpm.
2- Airbag light on.