just trade my 01 for a 06' and the manual says the manufacturing code for the door keypad is on the computer module. Where the heck is the computer module? I looked under the hood found the computer but theres no #'s!!!
Which cab configuration do you have? The controller/module (KEM) is usually on the back wall of the truck. If you have the screw or scab you'll have to remove the rear-seat (the back portion) to find it. There should be a label on it when you find it.
I just took mine to the local dealer. They did a quick scan and gave me the factory code. They didn't charge me anything, but I'm not saying that another dealer wouldn't. A lot easier than trying to take the damn back seat off.