Unfortunately i had this same code with cylinder 2 a few years ago on my 2013 SE 2.4l and it was the head gasket. i had a little over 71K miles and the extended warranty i purchased ended at 70K. i was not happy as it was a $1,500 repair but i paid it. I wrote to Dodge customer service and they issued me a check for half the cost. I had the repair completed at the local dealer and had to send Dodge my invoice. I felt somewhat better about the situation but still upset the head gakset failed after 5 years. Good luck with your Journey.