A relatively rare trouble code for Toyotas.. The most common cause here is a vacuum leak in the system that prevents fuel vapor from reaching the charcoal canister, where it is then sent to the engine via the opening of the PCV valve. To determine a leak test, you would need to visit a mechanic. But something you could do yourself is verify the fuel cap and filler neck are both clean and fit tightly together. Make sure there is no dirt, and the O-ring is not damaged/dirty/missing as this could allow fuel vapor to leak, thus triggering the sensor.
My personal guess here though would be a bad valve. In my line of work, I deal with faulty valves all the time. A valve consists of various moving parts and the ones that are solenoid operated, such as yours, can develop electrical faults over time. You can check the solenoid portion of the valve yourself using a multimeter set to Ohms and placing the two leads across the connector, one on each prong. Remove the power connector from the valve first of course. A typical solenoid will give a value something like 3 Ohms. (A solenoid is a coil of wire wrapped around a core which is usually attached to the device the coil is operating. When a current is applied, the coil forms an electromagnet that either pulls or pushes the core to cause valve operation. Your fuel injectors work in this way).
Should you see a reading less than 3 ohms, approaching zero, you have a short. If you see a very high reading or an "0L" or no reading at all, or "infinite", you have an open circuit. In both cases, the solenoid has failed and needs to be replaced.
Your canister could also be clogged, and despite Georgia's laws regarding the canister, it is a part of the purge system that needs to be present, and in good condition to allow proper operation.
I have included a link to a helpful information page which may further assist you.
Hope this helps!
P0441 Code Toyota
