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Thread: P0446 ????

  1. #1
    drod777 is offline Cadillac Owners Member
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    Question P0446 ????

    Well I just realized my engine light never came on when I would start up my SRX. So I had asked auto parts store to read my car and constantly argued about if it does not come on there is nothing he can do. Well soon to find out this code came up and the Guy was in shock there was a code!! So he told me what the code # but did not explain what it is.......
    Can someone help me out
    Thanks!


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  3. #2
    conedoctor is offline Cadillac Owners Connoisseur
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    Re: P0446 ????

    Bing it.

    Then search here for the answer, maybe a purge solenoid.

  4. #3
    glake89's Avatar
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    Re: P0446 ????

    From the SM-
    "This DTC tests the evaporative emission (EVAP) system for a restricted or blocked EVAP vent path. The control module commands the EVAP canister purge solenoid Open and the EVAP canister vent solenoid Closed. This allows vacuum to be applied to the EVAP system. Once a calibrated vacuum level has been reached, the control module commands the EVAP canister purge solenoid Closed and the EVAP canister vent solenoid Open. The control module monitors the fuel tank pressure (FTP) sensor for a decrease in vacuum. If the vacuum does not decrease to near 0 inches H2O in a calibrated time, this DTC sets."

    Advise if you want DIY help.
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  5. #4
    drod777 is offline Cadillac Owners Member
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    Re: P0446 ????

    Quote Originally Posted by glake89 View Post
    From the SM-
    "This DTC tests the evaporative emission (EVAP) system for a restricted or blocked EVAP vent path. The control module commands the EVAP canister purge solenoid Open and the EVAP canister vent solenoid Closed. This allows vacuum to be applied to the EVAP system. Once a calibrated vacuum level has been reached, the control module commands the EVAP canister purge solenoid Closed and the EVAP canister vent solenoid Open. The control module monitors the fuel tank pressure (FTP) sensor for a decrease in vacuum. If the vacuum does not decrease to near 0 inches H2O in a calibrated time, this DTC sets."

    Advise if you want DIY help.
    Ok thanks very much, do I just need to change Canister Vent Valve Solenoid that's near the gas tank or the one on the engine

  6. #5
    glake89's Avatar
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    Re: P0446 ????

    Not really that simple and those 2 parts aren't the only ones that can go bad. You can do most of the tests in the diagnostic by using other means than the tech II tool that they request. If you are serious, PM your e mail and I'll PDF the diagnostic.
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  7. #6
    drod777 is offline Cadillac Owners Member
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    Re: P0446 ????

    Well just spoke to an GM mechanic that is local and said it runs about $1300 to have it fixed for the front and rear

  8. #7
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    Re: P0446 ????

    You'll know why when you get the diagnostic.
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  9. #8
    glake89's Avatar
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    Re: P0446 ????

    Gave some extra thought to this. Since you don't have codes for fuel tank pressure, the vent system is working- just not fast enough for the little chinamen with the stop watches in the ECM. If you're not having drive-ability problems, not to worry.
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  10. #9
    drod777 is offline Cadillac Owners Member
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    Re: P0446 ????

    Quote Originally Posted by glake89 View Post
    Gave some extra thought to this. Since you don't have codes for fuel tank pressure, the vent system is working- just not fast enough for the little chinamen with the stop watches in the ECM. If you're not having drive-ability problems, not to worry.
    Ok so what do you think the issue is??

  11. #10
    glake89's Avatar
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    Re: P0446 ????

    I would guess a partial obstruction of the vent line. Since the DTC is based on how long it takes for the venting to reduce vacuum to near zero, the system is just working slow. If it didn't work at all you would get a DTC for high fuel tank vacuum.
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  12. #11
    drod777 is offline Cadillac Owners Member
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    Re: P0446 ????

    Quote Originally Posted by glake89 View Post
    I would guess a partial obstruction of the vent line. Since the DTC is based on how long it takes for the venting to reduce vacuum to near zero, the system is just working slow. If it didn't work at all you would get a DTC for high fuel tank vacuum.
    Do you know if there are any products that can clear the obstruction or add something to the gas tank?

  13. #12
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    Re: P0446 ????

    It is most likely a mechanical (physical) obstruction.
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  14. #13
    Sackett is offline Cadillac Owners Member
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    Quote Originally Posted by conedoctor View Post
    Bing it.
    I think that's the first time I've seen that phrase.

  15. #14
    PJ1520 is offline Cadillac Owners Connoisseur
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    Re: P0446 ????

    CONE owns shares of Microsoft...... :-) PJ


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