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hi new here first time to post got this code when i scanned the truck checked the hoses and elbows all around the canister didnt hear any leaks or see any wanting to know if there is a better way to check for the leaks other than just listening and also can the canister itself just quit working can this also trip a po171 code thanks
That could cause it if the outer lip of the filler is chipped where the cap seals.
A more common problem for a P0455 is a bad Canister Vent Solenoid or the wiring to it.
If you do a search in here I think you'll find a few posts about it.