How do you fix shift solenoid c performance or Stuck off?

To fix a shift solenoid C performance or "stuck off" issue, first, diagnose the problem using an OBD-II scanner to check for related trouble codes. Inspect the wiring and connectors for any damage or corrosion that may affect the solenoid's operation. If the solenoid itself is faulty, replace it, and ensure the Transmission Fluid is at the correct level and in good condition. After repairs, clear any diagnostic trouble codes and test drive the vehicle to confirm that the issue is resolved.