Code P0456, where is the EVAP Vapor canister purge valve located?

Hello, this is not necessarily a Purge valve issue, this is a small leak detected code. I'll post the diagram of where the Purge valve is located, but this system might need to be smoke tested to find small leaks like this.

Here is the location and testing procedure to check the Purge valve, this one is a bit different than a conventional Purge valve, it needs to be tested with a hand vacuum pump, while being energized. And yes, it's in a very difficult spot, the testing is off the vehicle testing. And if you do take it off or replace it make sure you mark where each hose to the valve goes, or you will get them mixed up easily. I have seen purge valves put on backwards causing Purge valve circuit codes that took a week to figure out what had happened. Apparently, the customer had it reversed and manifold vacuum was pulling it open on its own. But these small leak codes can be very difficult to find. And when I mean a small leak, the test run by the system is at 0.29psi held in the gas tank. Now atmospheric pressure is about 14psi, so this 0.29psi is actually a vacuum held in the tank. The Fuel Tank Pressure sensor monitors this pressure and watches for it to rise, that's how it determines if there is a leak. In the automotive world this is one of the most difficult Evap leaks to find. Because it doesn't have to be from one location, it can be a couple very tiny leaks causing it as well.

Ill post the Flow Chart to follow for finding the leak, but it requires a scan tool that can run a special functions Evap Leak Monitor test,
Another issue that makes it difficult is that some components will leak under pressure but not under a vacuum and the opposite as well. Pressure pushes out on tubes and fittings while a vacuum pulls them in, but I will post the Flow Chart for you. But you might want to change the Purge valve just to be sure that is not the issue. And at least you'll know it's not the valve, since we're dealing with such low levels of testing pressures. I would replace the gas cap as well, then clear the code and see if it comes back.

The self-test runs with 40 to 80 percent of fuel in the tank, engine coolant temperature is less than 97f when the engine is started, Intake air temperature less than 97f, engine coolant temp above 68f for test to run and that's just the beginning list of conditions that need to be met before the Evap system will run its self-test.
So, changing out the Purge valve and gas cap in this case would help you, because you don't know exactly when the computer will run this test next, because so many conditions need to be met. Let me get this service info together for you.

This is the entire flow chart for that code, except for the 16th diagram, which is a better look at the Purge valve location, the radiator cap I colored orange just to help with locating it.
The 6th diagram shows most likely leaking points, this code sets with a 0.020 leak size, which is the smallest leak that can code for the Evap system,
Did you get a Purge valve from the dealership or aftermarket parts store?