P261B On & Off

Discussion in 'Prius c Care, Maintenance and Troubleshooting' started by Alexander Nunn, Nov 30, 2024.

  1. Alexander Nunn

    Alexander Nunn Junior Member

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    Hello!
    Starting to get cold here in PA!
    Got this code one morning and it went away by the end of the day. Then a few days later it came back again after start up and went away by end day. Today it came back.
    Wondering if it’s time to replace water pump or if it is a sensor or relay?
    2012 Prius C Three
    120k Miles
    Another good thing to know is a just had the engine coolant and inverter coolant flushed and replaced couple weeks ago.
    let me know if you need to know anything else!
    Thanks !
     
  2. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    I've been reading about water pumps not hitting advertised RPM late in their lifetimes... I'm inclined to think you're reading an honest error code.
     
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  3. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    adding: I've also read about no-name pumps not lasting very long. If I were convinced that I had a real water pump problem in our car I would spend the money for a real Toyota pump.

    ...mind you I'd order it from one of the big dealers that runs a dedicated internet parts sales business, not any of the ones near us. Much better pricing for the genuine article.
     
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  4. Alexander Nunn

    Alexander Nunn Junior Member

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    I just ordered a new thermostat and AISIN WPT-190. I just got new coolant put in a couple weeks ago. Would you still drain it all or just catch what comes out when I remove both the pump & thermostat?
    Thanks
     
  5. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    I would catch and re-use, assuming I had a properly clean basin anyway.
     
  6. Alexander Nunn

    Alexander Nunn Junior Member

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    So ran into a problem and can’t get the one bolt off. Any suggestions?
     

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  7. vvillovv

    vvillovv Senior Member

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    WD or Blaster overnight.
    If you spun the head ( picture doesn't really show why you can't get it off ) file the head and use a 3/8 " wrench if it's a 10 mm head, and hammer it-(the 3/8" wrench) onto the head if you need to. Or use vice grips or a bolt spliter or heat or all 3 if needed.
     
    #7 vvillovv, Dec 7, 2024
    Last edited: Dec 7, 2024
  8. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    Remember to work it back and forth. Loosen a bit, tighten a bit Loosen a little more tighten a little less.

    That plus penetrating oil, colorful language and vvillovv's suggestions above will get you there.

    And get yourself a new bolt for the reassembly, you should not re-use that one.
     
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  9. Alexander Nunn

    Alexander Nunn Junior Member

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    Yeah the threads are screwed [lol]
    Will try the penetrating oil and loosen tighten
     
  10. Mendel Leisk

    Mendel Leisk Senior Member

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    Spec'd torque for the water pump bolts is 8 ft/lb. Maybe someone's been there before?
     

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  11. vvillovv

    vvillovv Senior Member

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    Is the bolt stuck - not turning at all- or is the bolt spinning in place.
     
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  12. Mendel Leisk

    Mendel Leisk Senior Member

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    If the latter sometimes levering up on the head while turning helps.
     
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  13. vvillovv

    vvillovv Senior Member

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    It took a minute or two and an edit or two of mine above before I realized. LOL
     
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  14. Alexander Nunn

    Alexander Nunn Junior Member

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    So it will turn to tighten but it won’t go any further to loosen. I just sprayed it with penetrating oil and will try again tomorrow.
     
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  15. Alexander Nunn

    Alexander Nunn Junior Member

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    Is the 2nd Gen the same as the 3rd Gen?
     
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  16. Mendel Leisk

    Mendel Leisk Senior Member

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    Ah wait a sec. I posted second gen water pump instruction. Prius c is basically a gen 2 engine, I made the leap of logic that consequently the water pump would be the same. It may be. Take it with a grain of salt though.

    That's all I've got; don't have a Prius c shop manual. A pdf version likely doesn't exist. :(
     
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  17. Alexander Nunn

    Alexander Nunn Junior Member

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    found one !
     

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  18. Mendel Leisk

    Mendel Leisk Senior Member

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    And the torque specs are different. :oops:
     
  19. Alexander Nunn

    Alexander Nunn Junior Member

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    The bolt is off everyone !!!
     
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