I was searching for complete lists of RPO codes here and found a few limited lists or some lists that were missing various codes. Maybe I missed a post with a full list but I just did a random google search for GM RPO codes and the first site I went to had every single code my car has listed. I did see the RPO decoder on the home page but I can't install it....this site is just that, a site with a list.

http://www.rpocodes.com/

 

There's quite a few sources like that, and while it's probably a good supplemental source, it has the same old problem due to GM reused/recycled RPO codes throughout the years.

There's examples where GM even used the same RPO code for the same platform with different definitions. Just look at RPO code Y84. In the later ThirdGens Y84 meant GTA while the early ThirdGens it meant the special edition Trans Am. The two are completely different.