Fashionable torque converters use electro hydraulic control to the lock-up clutch. The hydraulic circuit which locks/unlocks the torque converter clutch is managed using hydraulic valves. The valves are actuated instantly or indirectly by solenoids. The lifespan of the failing torque converter is unpredictable. It could last a few days or https://torque-converter-clutch42963.thezenweb.com/torque-converter-clutch-for-dummies-72019775