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    Thread: Help Needed!!! (P0446: Evap Emission Control System Vent Control Circuit)

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      Help Needed!!! (P0446: Evap Emission Control System Vent Control Circuit)

      I had P0446: Evaporative Emission Control System Vent Control Circuit last tuesday and once I cleared the DTC it went out. But today Saturday at the morining (the Car was off for more than 36 hours) the code come again 2 minutes after I run the car. I clearded the DTC again it went out.
      What is the problemn I had or this is normal?
      Thanks.



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      Administrator Daox's Avatar
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      Sounds like a bad evap solenoid.

      P0446 Evaporative Emmission Control System Vent Control Circuit

      What does that mean?
      Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on.
      The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.

      Symptoms
      There will be no obvious symptoms to driver, other than Malfunction Indicator Lamp (MIL) illumination.

      Causes
      A code P0446 could mean one or more of the following has happened:
      Faulty vent valve
      Open, short or excessive resistance on Vent valve control circuit
      Blockage of vent valve
      Bad PCM

      Read more at: P0446 Evaporative Emission Control System Incorrect Purge Flow
      Copyright OBD-Codes.com

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      Thanks, but when I clearing the DTC it went out and never come back for until today (tuseday).

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      Quote Originally Posted by drmagieed View Post
      Thanks, but when I clearing the DTC it went out and never come back for until today (tuseday).
      I have the same problem with my truck. You clear and it takes a while for it to come back. Some of the diagnostics in ODBII are binary and some use a trend. So when I clear my evap pressure on the truck it takes about four days. So it's time to take DOAX advice and replace a purge valve.
      Please do not power off, firmware update pending.....

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      Quote Originally Posted by xintersecty View Post
      I have the same problem with my truck. You clear and it takes a while for it to come back. Some of the diagnostics in ODBII are binary and some use a trend. So when I clear my evap pressure on the truck it takes about four days. So it's time to take DOAX advice and replace a purge valve.
      Thanks, you mean vent valve?

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      For better information to take the decision to change the vent valve, I attached the freez frame of the P0446 on my car.
      I hope to help me to take the decision.
      Thanks.
      Name:  Screenshot_2016-01-29-14-55-26.jpg
Views: 3430
Size:  7.4 KBName:  Screenshot_2016-01-29-14-55-44.jpg
Views: 3672
Size:  7.5 KBName:  Screenshot_2016-01-29-14-56-06.jpg
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      Yes the vent valve

      Please do not power off, firmware update pending.....

    8. The Following User Says Thank You to xintersecty For This Useful Post:

      drmagieed (01-30-2016)

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      I noticed that the code come back every 3 days but today it came with p0462 code: fuel level sensor circuit low input.. What does this mean?

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      It means there is something broken.
      P0462 Fuel Level Sensor Circuit Low Input | AutoCodes

      The vent solenoid and the fuel sensor might be on the same circuit. You should check the grounds and make sure the wiring in that section is good.
      Please do not power off, firmware update pending.....

    11. The Following User Says Thank You to xintersecty For This Useful Post:

      drmagieed (02-02-2016)

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      I replaced the vent valave and the code come again. I think if I need to replace the fuel filler neck?





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