So I been having this issue on multiple trucks now. I had a locked ecm out of an 03 did the unlock procedure and put a stock tune in it. Ran into another locked ecm in an 03 so swapped ecms and put correct vin and set the vats to disabled truck fires up but the security light won't go away. Put the original ecm in fires right up and no light. This has happened with multiple ecms even tried doing the 30 min relearn procedure as well. Anyone else run into this issue? What am I doing wrong lol?