LowBudgetZlatan

Hi forum members.

Newbee Chevy Forum Member here.
I have owned and operated a 2007 Chevy Suburban 2007 for more then 10 years and recently bought a pristine 2016 LTZ ( premier ) with low miles 70K.

A few days ago i was car pooling the boys back from soccer and someone had left a interior light on in the LTZ resulting completely draining the battery.
At first i though no problem i am just gonna recharge for 1-2 days and see what happens.
Reinstalled the battery and had a " Service Theft Deterrent System" notification.
Went online and tried to figure out which procedure to run to reset the Theft Deterrent System.

The car would crank for 1 second so i though ok the battery is toast and need to be replaced. so i got a new battery and tried again...
Same notice " Service Theft Deterrent System" notification.

Tried calling the dealer and the only thing they could say let's tow it in and we will take a look and scan the software.... WTF???

Can someone point me in the right direction for hard resetting the "Service Theft Deterrent System" specifically for a 2016 Suburban LTZ with a push start button and not an key....

Looking forward.

Thanks a lot.
LBZ