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P0443 code

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by MagnusAG99, Jan 14, 2018.

  1. MagnusAG99

    MagnusAG99 Senior Member

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    Hey, I’ve gotten a fault code on my car now that I don’t really Know what means... when I scan with Carista it comes up with P0443 ”Evaporative Emission System Purge Control Valve Circuit”

    What is that? I’ve tried searching for what it could be on google but it’s like searching for “my ear hurts” on google and it says u got cancer...
     
    #1 MagnusAG99, Jan 14, 2018
  2. Dxta

    Dxta Senior Member

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    Can't go into details, but it talks about an electrical circuit problems in the evaporative emissions component.

    Youught not pass your emissions test somehow, because the emission curtailing part of the system won't be working.

    Check the connectors of the component, or the wiring harness on the connector to see if they're fixed properly.

    But this doesn't stop your car from operating.
     
    #2 Dxta, Jan 14, 2018
  3. MagnusAG99

    MagnusAG99 Senior Member

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    ahh... it was just at service and stuff at toyota and they didnt mention that at all... it was also in for Periodic vehicle control where they do the emission tests and stuff and it passed without any faults or anything...
    ive seen some comments around the internet saying it could be just like a dashboard light not working and stuff to (my headlight dashboard light doesnt work), i got the same code about a month ago and it went away after i just opened up the tank lid.. so i just thought it was nothing but yea.. then i got the carista app to more deeply check the code and yea.. thats what it said. i did a emition test with carista to and it didnt find anything wrong.
     
    #3 MagnusAG99, Jan 14, 2018
  4. Prodigyplace

    Prodigyplace Senior Member

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    Make sure your fuel cap is installed correctly. I believe that sometimes triggers that code.
     
    #4 Prodigyplace, Jan 14, 2018
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  5. MagnusAG99

    MagnusAG99 Senior Member

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    the cap u screw in? it doesnt screw in all the way and click so that may be it... is it a circuit there? i have seen that screwing in and out the cap takes away the code for like a month. I asked the toyota dealership here tho when it happen first time and they said it isnt any kind of circuit there that can feel when the cap is in all the way.. and they didnt have any answer to why the "check engine" light turned off when i screwed it in and out again...
     
    #5 MagnusAG99, Jan 14, 2018
  6. Prodigyplace

    Prodigyplace Senior Member

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    There is no electrical circuit but it must seal properly for the emissions control system to function properly.
     
    #6 Prodigyplace, Jan 14, 2018
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  7. TMR-JWAP

    TMR-JWAP Senior Member

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    Part of the emission controls self test performed by the car includes pulling a vacuum on the gas tank. It then monitors the vacuum. Any abnormal leakage will cause the vacuum to dissipate more quickly. Loss of the vacuum at a higher rate than expected will trigger the code. Obviously, a loose gas cap will create a rather large leak.


    P0443 OBD-II Trouble Code: Evaporative Emission Control System Purge Control Valve Circuit Malfunction | YourMechanic Advice

    From the link:
    Code P0443 is a pretty common code that vehicles come in with today that causes the check engine light to come on. The most common cause is the fuel cap was accidently left off or not tightened securely after getting fuel. For this code the most common failure is the purge control valve has an internal open circuit or the vent valve will not hold in the vapors.

    Note that they supply "most common cause", which is an owner/operator problem.
    Then "most common failure" which is electrical failure of the purge valve or mechanical failure of the vent valve.
     
    #7 TMR-JWAP, Jan 14, 2018
    Last edited: Jan 14, 2018
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  8. padroo

    padroo Senior Member

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    #8 padroo, Jan 14, 2018
  9. MagnusAG99

    MagnusAG99 Senior Member

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    i see, well that explains it. Is there a way to fix that? replacing the fuelcap for example? i honestly dont know if it is the cap thats the problem or the threads on the car if that makes sense.
     
    #9 MagnusAG99, Jan 14, 2018
  10. Dxta

    Dxta Senior Member

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    Then y not try locking the cap once more, before thinking either to replace it?
     
    #10 Dxta, Jan 14, 2018
  11. MagnusAG99

    MagnusAG99 Senior Member

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    I have tried multiple times, when it feels like the threads stop, u screw it a little more, then it ticks, but pops back, it’s not more then a few like 5 millimeters it screws up but yea... it doesn’t come loose when I drive either. It’s “sealed” as much so it stays on and doesn’t move. But yea...
     
    #11 MagnusAG99, Jan 14, 2018
    Last edited: Jan 14, 2018
  12. padroo

    padroo Senior Member

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    Try clearing the code, tighten your gas cap and see if it comes back. It's the cheapest and quickest thing you can do.
    Make sure you inspect the gas cap gasket and the seat where it sets. If that doesn't work we will go to plan "B" whatever that is.
     
    #12 padroo, Jan 14, 2018
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  13. ChapmanF

    ChapmanF Senior Member

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    It sounds like if you had a new filler cap to try (not a very expensive part), you'd quickly be able to tell whether the new one feels weird in the same way. If it doesn't, you might have your fix. If it does, then possibly there is a filler neck issue.

    -Chap
     
    #13 ChapmanF, Jan 14, 2018
  14. MagnusAG99

    MagnusAG99 Senior Member

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    Thats what i tried when it happen last time, but yea... here the code is back lol.

    I guess i could try to take off the one from my moms prius and see if the problem would be fixed if i got a new cap. If not then i guess it is the threads on the head or whatever its called lol.
     
    #14 MagnusAG99, Jan 14, 2018
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