Fluid Coupling: It allows the motor to run independently of the transmission, so the car or truck can halt without having stalling the motor. The PCM/TCM is not going to established a DTC Until there is a trouble With all the electrical circuit controlling the torque converter clutch solenoid. Stall. https://torque-converter-clutch49369.thelateblog.com/34483374/little-known-facts-about-torque-converter-clutch