I always recommend that you just remove the torque converter in the transmission to diagnose it correctly. You will find a challenge With all the electrical circuit in the torque converter clutch solenoid. Therefore the Manage module (PCM/TCM) can not properly Manage the clutch, which implies the torque converter clutch https://torque-converter-clutch86306.nizarblog.com/34413824/top-torque-converter-clutch-secrets