Hi, can you tell me more about this. I have the same trouble code. The sound isn’t coming from the pcv valve and I checked the purge valve. My sound is coming from inside around the intake. It’s not sustained, it’s like 7 seconds then a short hiss that vibrates the surrounding area. Sounds kinda like a horn type vibration. Releases pressure every 7ish seconds.But you need to have the dealer check for the orange check valve in the intake as well.