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NEED HELP

MGraber

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MGraber Enthusiast

MGraber

Posted
Posted

I have a 2000 shortbed, 2wd, reg cab silverado with the 5.3. Driving home from work today my "service engine soon" light came on. I have autotap and hooked it up to find the code. It produced the code: PO446 which according to the autotap web site is the Evaporative Emission Control System Vent Control Circuit.

 

Any idea what this could be?

 

Any help is appreciated. I am hoping it is something small so I do not have to take it to a mechanic.

 

Thanks,

 

Mark

stef8 Enthusiast

stef8

Posted
Posted

First, check if the fuel cap is loose. The DTC P0446 could be set for that reason.

Also check for incorrectly routed or defective EVAP system vacuum and vapour lines.

 

A defective fuel tank pressure sensor that does not correctly respond to pressure

or vacuum causes this DTC to set.

 

A malfonctioning or damage vapor canister could also be the cause.

 

Good luck

Stef

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