cant find it and i need to have it, pics or even a description of where to find it would be very helpful. thanks

 

it's supposed to be three letters and then a number

 

It is in two places. 1st (easiest) is a white label on the PCM bracket near the fusebox on the passenger fender. It is also on the label on the PCM in a string of numbers under the barcode (you will not see it unless the PCM is in your hand). Yes it is four characters. Mine is CDC3.