Modern day torque converters use electro hydraulic Handle for that lock-up clutch. The hydraulic circuit which locks/unlocks the torque converter clutch is managed working with hydraulic valves. The valves are actuated straight or indirectly by solenoids. Even so, like any mechanical element, torque converters can wear out or malfunction as https://torqueconverterclutch08630.ampedpages.com/top-guidelines-of-torque-converter-clutch-60953403