I bought a used 2005 Tahoe several months ago and the dealer did not have the original key fob for it so he fished around and found one that he could make work so I was fine with that. The other day I was purchasing a new battery for it and when the guy at the auto store was connecting the battery for me the Tahoe suddenly started, I had the key In my pocket. The park lights were flashing slowly and could not get it to turn off until I hit the brakes. The guy from the store said it had a remote starter. My question is, how do I find out if it is from the factory or aftermarket? If its aftermarket, where do I look to try and find what brand it is so I can get a fob for it to remote start it. Thanks for any help.