One problem related to turn signal has been reported for the 2013 Jeep Wrangler. The most recently reported issues are listed below.
Vehicle stalls at random times but most often when putting into reverse after sitting for a while. It has stalled while driving on major roads which could have been life threatening. The transmission also shifts very jerky at times for no real reason. The windshield wipers will come on randomly and usually seem tied to turn on the turn signals which happen to be on the other control knob. Lights will dim on nav/radio when windshield wipers are turned on. I would say there is an obvious electrical/computer issue that must be causing these things to happen. I have read hundreds of similar complaints.