Sorry to dig up an old thread, but I need to beat this horse a little more...
I have a 2011 Sierra; with RPO code AP8.
I bought part number 17801236. Authentic GM, with verification code.
I've asked my local dealer to install it, and Dealer sais I've been "reading on the internet too much"... and that "I can't just program the fobs and have remote start". "it's not that simple"
They're telling me I need the kit, "with all the wires and stuff" which they quoted at the exact same price that I paid for 17801236. But this 'Kit' takes 3 shop hours to install, so total would be around 600$, how would you like to pay.
I'm going to the big city tomorrow, to a dealer who has a clue. Can anyone confirm that I am not missing something?