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GMC Sierra 1500: 2001 gmc Sierra 4.8 engine. Check engine light

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2001 gmc Sierra 4.8 engine...
2001 gmc Sierra 4.8 engine. Check engine light is on , Code PO446 . Is there anything common on these truck to have this code on.
Submitted: 6 years ago.Category: GMC
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12/19/2011
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 6 years ago
Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 29,659
Experience: GM Grand Master Technician 2007. 14 year experience.
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Gm Tech (Cam) :

Hello, I'm Cam. Please include all the details about your issue so I can accurately advise you. I cannot see your vehicle so please be detailed.

Gm Tech (Cam) :

Yes this is almost always dirt or ice in the vent valve. On your truck it is under the fuel filler area.

Gm Tech (Cam) :

THey get dirt in there and that plugs the canister infront of the tank .

Customer:

Thanks

Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 29,659
Experience: GM Grand Master Technician 2007. 14 year experience.
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Customer reply replied 6 years ago
Cam i took hose off of canister and blew air back threw it . do you think this will work?
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 6 years ago
Did you blow through the small lines and out the large lines?
Did dirt come out?
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Customer reply replied 6 years ago

Cam i took hose off of canister and blew air back threw it . do you think this will work? Sorry it was big hose.

 

GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 6 years ago
YOu need to plug one small, blow back through the other smaller and out the large hose.
Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 29,659
Experience: GM Grand Master Technician 2007. 14 year experience.
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Gm Tech (Cam) and 87 other GMC Specialists are ready to help you
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Customer reply replied 6 years ago

Should i blow threw small lines too? I could feel air coming out at vend valve.

Ok i will do that.

GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 6 years ago
Only blow through the smaller lines to push the dirt back out the large line.
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Gm Tech (Cam)
Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
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