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Message: <blockquote data-quote="Marky Dissod" data-source="post: 25536" data-attributes="member: 13218">Looking at your sig, odds are (cannot guarantee) thatyour '02 likely has a mechanical cable throttle, so your '02 PROBABLY has a P01, aka 12200411.your '05 likely has an electrical signal throttle, so your '05 PROBABLY has a P59, aka 12586242.Although there are several exceptions, the gist is pretty much as above for GMT800 (other vehicle platforms will make this more confusing).If you go to GM Parts Giant's VIN DeCoder[URL unfurl="true"]https://www.gmpartsgiant.com/vin-decoder.html?vin=yourVINgoesinhere[/URL]it'll give most of your RPO codes and help you shop for your replacement pcm(s).Do NOT buy anything from GM Parts Giant! Use it to figure out what to buy, but buy somewhere else.</blockquote>