The door keypad on my wife's 2013 Limited stopped working about 3 months ago. The keypad lights up when you touch it, but you can no longer lock or unlock the vehicle. One feature my wife loves is being able to leave the key fob in the truck, lock the doors and not worry about it. We had the truck valet'd one day and ever since then it stopped working. I can't even program a new code. Any help would be greatly appreciated.