Can someone do me a huge favor and take the little plastic cover off the positive side of the batter and take a pic for me. Check engine light and check forward collioson sensor warnings came on today. Code is U0001. (Canbus) a lot of times this is electrical Gremlins so I thought I would check the battery connections. It looks like to me there is a missing nut. The dealer said they looked at another Jeep and it was not there either so they are sure it is supposed to be like that. It is not the nut on the post but just to the rear of the post. There are 3 or 4 little posts all of them except one has a nut there. (Why would they put a post there with no nut on it?!?)