Check engine light 2007 Yukon XL 2500

[Dasanii19]

2007 Yukon XL 6.0 2500 4x4

check engine light is on. Here are the codes:
PO446 (current history)
P0496 (intermittent)
C0055 (history)

I did change the purge valve. I disconnected the negative terminal and reconnected. Light was off for a week and now back in. What else would I do?

 

[Doubeleive]

Could be the other solenoid and/or vapor canister, the c0055 is a wheel hub (abs code), just disconnecting the battery does not clear codes.

 

[swathdiver]

2007 Yukon XL 6.0 2500 4x4

check engine light is on. Here are the codes:
PO446 (current history)
P0496 (intermittent)
C0055 (history)

I did change the purge valve. I disconnected the negative terminal and reconnected. Light was off for a week and now back in. What else would I do?

Could be the Fuel Tank Pressure Sensor or a bent, restricted, clogged line or restricted canister. Without throwing parts at it, you need a bi-directional scan tool like the Tech-2 to run tests and observe the performance of the vent and purge valves.

 

[Dasanii19]

Could be the Fuel Tank Pressure Sensor or a bent, restricted, clogged line or restricted canister. Without throwing parts at it, you need a bi-directional scan tool like the Tech-2 to run tests and observe the performance of the vent and purge valves.

Thank you, it’s also showing this code
P2066

 

[swathdiver]

Thank you, it’s also showing this code
P2066

That's for your rear fuel level sensor. You have a second tank above your spare that fills and feeds from the primary so you never notice it working. You can drop it, open it up and see if anything is obstructing the arm from moving or just replace it with a new one since you're already in there and did all the work. You could clear the code and see if it comes back. If you have a Tech-2 you can run some tests and view the failure records before dropping it or buying a new sender.