The torque converter clutch solenoid is often energised (stuck on) which translates in to the torque converter becoming always locked. Slippage consumes power in the course of the coupling phase. Locking the converter shell to the turbine shaft helps prevent this slippage from transpiring. An overheating transmission can spell issues https://torqueconverterclutch08629.blogdomago.com/32889590/details-fiction-and-torque-converter-clutch