2018 GMC/Chevy/Cadillac/ Yukon XL No Cranking No Starting Transmission Control Module was Replaced 

This is a 2018 GMC Yukon the transmission control module was replaced
they call me to program it, but when i try to start it the car did not crank t told the tech that the car can start regardless if the TCM is programmed or not finally he went down the car adjust the connector, and the car started then i was able to program the TCM