P0449 Check Engine light

[Chadwilliam1]

Hello, I searched but couldn't find anything. I am looking for advice on resolving my CEL P0449 on my 19 suburban 5.3 with 110k miles.  I replaced Vapor canister vent valve solenoid and Canister Purge Valve. I cleared the code and it came back.  I am thinking my next step is to trace the wiring but before i did that id like to see if there is a common issue i am not aware of.

Any suggestion on what i should look at next?

 

Thank You

[mjm-1957]

Make sure the fuel tank pressure sensor is reading correctly.Get a good scan tool that can command evap control functions and read live data and see what it is reading with the gas cap on and off and when commanding evap purge seal test.We change these sensors all the time.Pretty common failure.

[tbarn]

Check your wiring. P0449 is strictly a vent valve code