Depending on the vehicle, replacing a transmission solenoid can be relatively straightforward ... and more. To diagnose a faulty transmission valve body, you'll most likely require a professional ...

a faulty or malfunctioning shift interlock solenoid is another one of the most common causes of a shifter stuck in park. The shift interlock solenoid works with the transmission control module ...

However, more complex issues like worn gears, repairing or replacing a faulty solenoid, or rebuilding the transmission, will require professional skills and equipment. You can do things like ...