I'm a prime candidate for having the canister soaked with fuel. But I've never seen this error code on either the RL or the Pilot.Faulty purge or vent valve or related wiring
Faulty pressure sensor or related wiring
Canister is saturated with fuel (Do you continue adding fuel after the pump automatically shuts off?)
One thing that can't cause this code is a faulty gas cap. A leaking gas cap will cause a "CHECK FUEL CAP" message and set a code for leak detected. P0497 doesn't mean there is a leak - it means there is a buildup of pressure when there shouldn't be.