If anyone is having problems with an inoperative IKT system (key/transmitter combo) and your vehicle was built on 9/1/2011 through 12/1/2012, then there is an updated gasket available for the transmitter that helps the battery maintain pressure on the internal contacts. The TSB is 13-08-07 and the part number is DC3Z-15K601-AA. You will need one part for each of your keys. The gasket is easy to replace. Just follow the battery replacement instructions in the owner's manual.