How do you fix torque converter clutch circuit stuck on?

To fix a torque converter clutch circuit that is stuck on, start by diagnosing the issue using an OBD-II scanner to check for any trouble codes. Inspect the wiring and connections related to the torque converter clutch solenoid for damage or corrosion. If the solenoid is faulty, it may need to be replaced. Additionally, check the Transmission Fluid level and condition, as low or dirty fluid can affect clutch operation.