P0449 still persists after changing out charcoal canister and both vales?

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ClassFAirspace

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2018 Escalade ESV with 131,000 miles

I got P0449 a week ago and finally got all of the parts together to change out the related components. I used all ACDelco components to change out the charcoal vapor canister (84106549), vent valve at the back (84148820) and purge valve on the engine (12630282).

I cleared the code and then it immediately came right back the next time I started it up. My code reader says one of the instances of P0449 is "permanent" and I will need to drive 200+ miles without malfunction until it clears. Could this be why the check engine light and code keeps popping back up or is it going to be a wiring issue now? Also, if it is the wiring issue how big of a pain in the butt is it going to be to replace?
 

West 1

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Does your scan tool allow you to test the EVAP system?

If it is working properly driving can get you cleared again. I have only worked with one Permanant code and that was on a Mercedes, same thing, had to drive the miles and have a number of trouble free starts before it would clear.

On EVAP issues I have found a smoke machine to be very effective finding the problems before installing new parts. Of course it does not find electrical issues only failed lines and canisters.
 

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