My code for my 06 was on a card inside my owners manual. Im not sure if they print it somewhere on the vehicle itself.
Yeah this is where I originally looked but the card was missing. I also purchased the vehicle used... I did a quick search before posting and a few users said it was behind the seats or under the dash. I wouldn't mind some direction or even an exact location before I tear the vehicle apart looking for the damn thing.
oops, yeah it is on the rear driver's side. Here is some info from a member's old post:
I found the code (with some help from my neighbor). It is behind the plastic trim that is in the rear corner on the driver's side of the cab. Down near the floor. Remove the door seal and pull the plastic trim away from the truck sheet metal. You might have to take off some more nearby trim to see better. With a flash light I could see the 5 digits, they were even right side up when looking from the outside. The numbers were on the right side (towards the tail gate) about in the middle of the computer. The computer has the word Siemans on it.