Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner past midnight.
The symptoms you have described are not that of a stock vehicle. This sounds more like someone has added an aftermarket alarm, immobilizer, or remote start to the vehicle. I would begin with disabling that system to see if the OEM system takes back over and allows the vehicle to start and run correct. Can you try that?
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It appears the dealer installed an aftermarket system in addition to the one the truck already has and then turned around as sold it to you as a highly marked up security system. On your remote fob should be a name brand of this system. If you can get me that, I can go to that website to get you the install directions which you follow backwards for the removal directions.
Hello again Chris here,