The code P0449 gets triggered when the PCM detects that the fuel tank pressure is too low, typically due to a stuck canister close valve.
Are you experiencing any drivability issues?
If the code does not exist any longer, it is possible that it got turned on due to certain vibration that could have made the harness get loose.
I have attached some helpful information below.
Please let me know if you have any questions.
Images (Click to enlarge)
Saturday, January 29th, 2022 AT 9:37 AM