Hi!
Spent few months troubleshooting my car with this P0441 error - first I tried replacing the valve assembly (by the way, if someone is looking for 05E906517A - this has a new part number now which is 05E133366AN). Changing valve and sensor assembly did nothing, error kept popping up after one day of error reset. I returned this part back to the shop and installed old assembly.
What fixed my error was replacing charcoal canister (part 5WA201801). It is located in rear-right wheel well. Bottom connector was very hard to disconnect, spent 1-2 hours with my mates and ended up brutforcing the clip out breaking it. Attached back with ziptie
Now 4 weeks passed, error not coming back.
My car is: Q2 1.5 R4110 DSG, 2020, GABAZG, DPCA, UAG