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P0012 error code issues

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by BenHoneywill, May 3, 2024.

  1. BenHoneywill

    BenHoneywill New Member

    Joined:
    May 3, 2024
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    Location:
    FL
    Vehicle:
    2012 Prius
    Model:
    Five


    I need some more suggestions please.

    Had to change the Head gasket out on my 2012 prius(400000+miles) and since then have had the p0012 error code. Have changed the oil etc what seems like a billion times, sometimes with cleaners too. Have replaced all the potentially affected sensors out. Have replaced the timing chain(which was slightly stretched) and the vvt gears etc. Just had to replace out coils too as was getting misfire codes but that was just a recent thing.

    Engine runs "ok" and when I clear the dtc codes for the first drive it doesn't come back on but it always does on the second drive!

    Also most likely unrelated passenger airbag remains illuminated "off" even with passenger needing one sitting in seat?

    Any suggestions please
     
    #1 BenHoneywill, May 3, 2024
  2. Lubrico

    Lubrico New Member

    Joined:
    Jul 17, 2024
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    Location:
    Pakistan
    Vehicle:
    2007 Prius
    Model:
    II
    I am having same issue in prius gen 2. Tried every thing but no sucess
     
    #2 Lubrico, Jul 22, 2024
  3. bisco

    bisco cookie crumbler

    Joined:
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    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    did you change the camshaft variable timing solenoid?
     
    #3 bisco, Jul 22, 2024
  4. Lubrico

    Lubrico New Member

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    Location:
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    Vehicle:
    2007 Prius
    Model:
    II
    Yes ocv is changed. Now I m thinking to check oil pump pressure and same time rotate engine manually to see oil circulation inside head. Looks like oil pressure is lost somewhere and it's not reaching vvti phaser resulting in p0012
     
    #4 Lubrico, Jul 30, 2024
  5. Lubrico

    Lubrico New Member

    Joined:
    Jul 17, 2024
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    Location:
    Pakistan
    Vehicle:
    2007 Prius
    Model:
    II
    Yesterday I have changed timing chain set. Phaser is also changed but just found that phaser of 1nzfe is diff from prius cam phaser
    But still same engine shifting to battery and back is very rough. Lack of engine power Fuel average is bad,
    Only part left to change is oil pump. I m not sure will it make any difference.
    Why it's so tough to clear this code
    Any Prius expert please come forward
     
    #5 Lubrico, Aug 11, 2024
  6. Lubrico

    Lubrico New Member

    Joined:
    Jul 17, 2024
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    Location:
    Pakistan
    Vehicle:
    2007 Prius
    Model:
    II
    Finally going to replace engine JDM
     
    #6 Lubrico, Sep 26, 2024
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