Hi,
I have a copy/paste with instructions on finding your code:
Facing the truck it's on the right behind the battery. Remove the battery cover. Remove three plugs on that shiny thing which is your PCM. Remove two 10mm bolts. Remove PCM and turn it upside down. There's a little sticker that shows three letters and a number, i.e. YRE2, DAX0, TBS7, BKG9. That is your computer code/tear tag. I suggest you place the sticker on the right hand side of the PCM so you can always see it. If you don't remember what it is you can see it without the need to remove the PCM again.
I am not real technical so when DJ explained it to me, I put it in writing.
Thanks,
Vivian