Question about 2000 Chevrolet Silverado 1500

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HAVE A TROUBLESHOOTING MESSAGE PO446 ON A 2003 CHEVROLET SILVERADO 1500. CHECKED GAS CAP AND TIGHTNED NO CHANGE. AM LOOKING FOR LOCATION OF FOLLOWING PARTS PURGE OR VENT SOLENOID VAPOR CANISTER EVAP VENT SOLENOID and can i fix this without mechanic

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  • matt49team Dec 18, 2008

    How do I fix my Evap problem?? I changed the PCV still no luck. I need to pass inspection in 1 week.

  • goldnspec Jan 23, 2009

    my 2000 chevy silveado's service engine soon light just came on and the OBD code is P0446 which according to the book I have is an EVAP Emission control system vent circuit malfunction. Any help is appreciated as to what I have to replace. Also is it ok to continue driving this for the time being until I get this fixed. thanks

  • Anonymous Mar 05, 2009

    Who can offer a solution, not just more info about the problem?

  • pb_107 Apr 06, 2009

    I have the same problem on 2003 silverado 4.3L

  • Anonymous Apr 26, 2009

    2003 Chevy Silverado 5.3L VORTEC V-8 - 12,000 miles - exact same problem - is this something that can be fixed at my house or must I take it to the dealer?

  • Anonymous Mar 16, 2014

    location of solenoid

  • Anonymous Mar 17, 2014

    I understand this has to do with emissions purge. I replaced gas cap... no luck. I had it checked by the dealership, and the stated they noticed moisture in the lines when inspected. Should I replace both the NVLD pump and Solenoid?... or just one or the other? Where are these located? How difficult will it be to do do myself, or should I just have a mechanic do it? How much time should it take? Any other suggestions would be greatly appreciated as well.

  • Anonymous Mar 21, 2014

    where is the evap. purge locatd on 2002 chevrolet located?

  • Anonymous Mar 21, 2014

    fuel leaking from the top left of fuel tank

  • Anonymous Mar 28, 2014

    show location

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DTC P0446 Evaporative Emission (EVAP) Vent System Performance

The vehicle control module (VCM) monitors the performance of the evaporative emission (EVAP) system by applying a predetermined level of vacuum to the EVAP system and monitors the vacuum decay rate. The VCM sets this diagnostic trouble code (DTC) if the vacuum decay rate is more than a predetermined value. The VCM monitors the amount of vacuum and the amount of pressure in the EVAP system by monitoring the fuel tank pressure sensor. For this DTC, the VCM turns ON both the EVAP purge valve and the EVAP vent valve when the Conditions for Running the DTC are met. This applies an engine vacuum to a closed EVAP system. The VCM turns OFF both the EVAP purge valve and the EVAP vent valve when the system reaches a correct amount of vacuum. The EVAP system should quickly RELEASE the vacuum in the EVAP system with the EVAP purge valve OFF and the EVAP vent valve OFF (open). This test indicates a blocked or restricted EVAP vent path if the EVAP system fails to release the vacuum quickly enough.

HAVE A TROUBLESHOOTING MESSAGE PO446 - 3208f98.gif


Posted on Dec 06, 2008

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Evaporative Emission (EVAP) how to find a leak without replacing canister on chevy silverado 1500

Posted on Jan 18, 2010

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2007 Chevy Silverado 1500 Diagnostic code P0442 repair?


Usually this is a loose or improperly sealing gas cap. The code will clear out (iirc requires 3 starts from cold) or get your local autoparts store to clear it for you. Gas cap is easiest and cheapest thing to try. It can also be a leaky evaporation canister, leaky vacuum hose, leaky fuel filler hose...etc. basically as part of the test cycle it checks to see if the evaporation system holds a specific vacuum for a specific time. Yours failed the test.

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How do you get change engine oil to disapper?


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