There's a trouble With all the electrical circuit in the torque converter clutch solenoid. Therefore the Command module (PCM/TCM) cannot properly Management the clutch, which means which the torque converter clutch is possibly in a permanent/intermittent locked point out, or open condition or slipping. The TCM controls the TCC solenoid. https://jaidenovusp.madmouseblog.com/14738867/torque-converter-clutch-fundamentals-explained