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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 29516
Experience:  GM Grand Master Technician 2007. 14 year experience.
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GMC Sierra 1500: 2001 gmc Sierra 4.8 engine. Check engine light

Customer Question

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: 5 years ago.
Category: GMC
Expert:  Gm Tech (Cam) replied 5 years ago.

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) and 5 other GMC Specialists are ready to help you
Customer: replied 5 years ago.
Cam i took hose off of canister and blew air back threw it . do you think this will work?
Expert:  Gm Tech (Cam) replied 5 years ago.
Did you blow through the small lines and out the large lines?
Did dirt come out?
Customer: replied 5 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.

 

Expert:  Gm Tech (Cam) replied 5 years ago.
YOu need to plug one small, blow back through the other smaller and out the large hose.
Gm Tech (Cam) and 5 other GMC Specialists are ready to help you
Customer: replied 5 years ago.

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

Ok i will do that.

Expert:  Gm Tech (Cam) replied 5 years ago.
Only blow through the smaller lines to push the dirt back out the large line.

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