How do you unstick the shift solenoid?

To unstick a shift solenoid, first, ensure the vehicle is safely parked and the engine is off. You can try tapping the solenoid gently with a tool, as this may help free any debris or corrosion. If that doesn't work, disconnect the battery, remove the solenoid, and clean it thoroughly with appropriate solvent. Reinstall the solenoid and reconnect the battery to test if it operates correctly.