P0449 Evap Vent Solenoid - Replaced Vent Valve and still wont go away.

[kaczman]

Hi all,

2007 Avalanche 1500 5.3L. I already replaced my Vent valve solenoid with the new vent solenoid and harness under the spare tire about a year ago.

I remote started the truck yesterday, and it shut off after about 5 seconds. Pulled the code with my Tech2, and it says P0449 - Evaporative control system vent valve/solenoid circuit. Every time I clear it, it comes back immediately. Like as soon as the DTC is reset.

So I bought another vent valve kit with the relocation harness and tubes and installed them. Reset the DTC, and it stayed off for about 10 minutes, then came back on. Now when I Reset the code again, it immediately comes back again.

I bought the evap purge solenoid to replace on the drivers side of the engine behind the throttle body. Any other suggestions?

[kstruckcountry]

The issue is most likely the evap canister itself, what the evap solenoid runs to. It gets filled with dust and needs replaced.

[txab]

Check the wiring

[durandetto]

Check for power to the vent valve and check the ground while commanding the solenoid on with your tech 2. That's if you can't hear the solenoid clicking while commanding it on and off. If it's clicking then the problem is somewhere else in the system.

 

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[ram1067]

The issue is most likely the evap canister itself, what the evap solenoid runs to. It gets filled with dust and needs replaced.

X2

[kaczman]

Thanks guys. I replaced the vent valve solenoid, wasnt it. I replaced the front purge solenoid, just for the hell of it, that wasnt it.

 

The old canister itself was VERY full and pretty rough. I replaced that too, that wasnt it.

 

Ended up being the power wire was corroded. Replaced it, problem solved.

[txab]

Bingo!