It's been a month or two since I did one last. I believe it's the BCM that you have to reprogram. The dealer will have to call GM and get what is called a VCI#, which is basically a vehicle specific reprogram number. They will have to tell GM what they are trying to do, and GM will give them that #. This is a little bit of a pain in the rear, so if your dealership doesn't want to help you, expect them to give you a line saying it can't be done. But it can be. WE've done it to 6 or 7 trucks.
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