I have a 4l60E when you take off and go though the gears it calls for the TCC to come on and it does but the slip is 80-90 %. Once you gear down for any reason it never calls for it again. It stays off until you turn engine off and back on. It will throw code P0741 - Torque Converter Clutch Solenoid Circuit Performance/Stuck Off.
Setup
E40, ECM, GM Gen4 V8 - OP 12612557
T42, TCM, GM A4 OP 24235341
2006 4l60E 4x4 13 pin