After 2010 GM removed the ability to add new keys and program the remotes via the dash controls. You might think that sucks but you did get redesigned door mech, double layer glass in the D/P side windows just like the windshield and a steering wheel lock.
There’s a product call AutoSync worth it’s weight in gold that’ll allow you to do the programming from in the truck. All the other features are bomb digidy.
2007-2014 AutoSync-G2 (GMT-900)IMPORTANT NOTE EFFECTIVE JANUARY 15th 2023. All AutoSync's now include the torque converter lockup controller feature as standard equipment, however it will only be active/function on 6.6 Duramax diesel vehicles. The new second-generation AutoSync-G2 is now available...new features and...www.btdieselworks.com
I'm guessing that AutoSync needs to stay in the OBDII port?