One problem related to speed sensor has been reported for the 2013 Jeep Wrangler. The most recently reported issues are listed below.
I was driving with my children in the Jeep to a dental appointment driving 45 miles per hour. I hear a cling clunk sound and abs light comes on and then a loud bang and Jeep does not want to go. I pulled over right away I smell a awful smell. So I shut my truck off. Called my husband and leave my truck and get a ride to dental appointment. We called a tow truck next day to have it towed to auto repair shop. I get a call two days later stating my emergency break system had faulted and engaged it's self snapping my axel, speed sensor and break rotor. All of these things were ripped and everything will need to be replaced due to emergency break system failure. If I had been going on the high way at high way speeds I could have flipped my vehicle with me and my children. This issue needs to be replaced by the manufacturer do to it being faulty emergency brake system.