I knew the 2012s had a head problem, which is why I ordered a 2013. Apparently there were a few heads left over when the 2013s started rolling off the assembly line. I had a check engine light come on a few days ago, which I assumed was a gas cap. Well you know what they say about assuming. I took the jeep into the dealer yesterday to get the code cleared and it was a repeated cylinder 4 misfire. So apparently it is a head issue and I will be Jeepless for a week or so while they replace the head. I'll update this when I know more. FYI the Jeep has a July 2012 build date.