This code indicates a large leak in the system. The leak will need to be 2.5mm or larger, so in this case, I don't think it's the fuel cap. It's possible, but I have a feeling you have an EVAP hose off, broken, or damaged in some way.
If you look at the pics below, I added the EVAP system schematic (pic 1). Pic 2 shows where the canister purge valve is located on the engine. You will need to remove the plastic cover on top of the engine. Once you do that, locate the purge valve. There will be two hoses going to it. I highlighted them in pic 2. Confirm they are properly connected, not damaged, and not leaking.
Pic 3 shows the charcoal canister which is located on the right side of the fuel tank. The canister and valve are attached via the hoses even though they are in different locations. Do the same thing. Check for issues with the hoses going to it. There will be three on this item. The pic shows a connection for the "purge". That is the one that goes to the canister purge valve. Make sure it is good. Also, make sure there are no holes in hoses, damage to the charcoal canister, or anything that seems damaged.
Let me know what you find.
See pics below.
Images (Click to enlarge)
Monday, June 14th, 2021 AT 10:09 PM