Hello, I am a new member to the forum. I recently purchased a 2008 Silverado 2500HD crewcab with a 6.6 L Duramax engine. The truck is a WT trim model with power windows and door locks. I purchased the truck with only the keys and no RKE fobs( the dealer refused to offer them). I did manage to obtain the buildsheet for the truck. I found two RPO codes involving keyless entry, the first is 5B5- "SEO-PWR WINDOWS AND MIRRORS-STD KEYLESS DOOR LOCK DELETED" and the second is AU3-"POWER DOOR LOCKS WITH REMOTE KEYLESS ENTRY"

My question is whether I can add factory remote keyless entry or do I need to go the aftermarket route for keyless entry and remote start?. Would adding the DIC upgrade offered by GM do anything to help?

Thanks in advance for your help