Modern day torque converters use electro hydraulic control for your lock-up clutch. The hydraulic circuit which locks/unlocks the torque converter clutch is managed employing hydraulic valves. The valves are actuated straight or indirectly by solenoids. Visible Inspection:  Start with a essential visual inspection. Try to find any signs of leaks https://zanderizmxi.blogdomago.com/32890166/not-known-facts-about-torque-converter-clutch