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2011 Silverado 1500 LTZ remote start?

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Hey everybody. I own a 2011 Silverado 1500 LTZ, and in the glove box I have the RPO code AP8.


I purchased a Dorman 4 button fob included with an OBD2 programmer. I followed all of the steps to program, and the fob works with locking/unlocking. However, when trying to remote start, the blinkers flash like they saw the trigger, but the truck doesn't start. 


Being that I have AP8, what else do I need to do in order to make this work? My local dealer is asking for $330 for a new fob and programming (saying there is more involved than just programming a fob), but if this is something I can do myself with the right equipment, I'd like to think I can handle it.



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