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Brake and Accelerator Same Time with Dr. Prius Overheating

Discussion in 'Gen 3 Prius Technical Discussion' started by A.J, Dec 13, 2023.

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  1. A.J

    A.J New Member

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    Hello everyone,
    I just got a Canadian Prius 2010 194,000km, and wanted to test the battery. Hence i had to use Dr. Prius which required i press both break and accelerator same time. Did it till battery was upto 50% and had to press both for over 3minutes, after which i saw the Coolant Overheating Icon.
    I released the pedals and it went away, but when i drive now and the combustion engine kicks in, the coolant temperature rises to 115-120 degree celsius within 1-2minutes of speeding.
    I wanted to know if pressing break and accelerator is the cause of this or just mere coincidence. I mean, i have not seen a coolant overheating error since i've been driving it for some time.
    I checked via Carista and saw the misfire error, which wasn't there before the overheating issue, so the overheating thing brought about that.
    Any help would be appreciated.
     
    #1 A.J, Dec 13, 2023
  2. TMR-JWAP

    TMR-JWAP Senior Member

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    hmmmm..isn't this the mileage where head gaskets commonly fail on the early Gen 3s? Maybe the previous owner offloaded a special deal onto you? Hope not, but sounds suspicious, especially with cylinder misfire. Is it cylinder #1?

    Or you may have a failing coolant pump, or low coolant level, or....
     
    #2 TMR-JWAP, Dec 13, 2023
    Brian1954 likes this.
  3. bdc101

    bdc101 Member

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    What's the coolant level at?
     
    #3 bdc101, Dec 13, 2023
  4. A.J

    A.J New Member

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    Oh, thanks.
    Does this mean pressing brake and gas pedal simultaneously can't be the cause?
    Also, I will be changing the Head Gasket next week too incase that would also solve the issue.
     
    #4 A.J, Dec 14, 2023
  5. A.J

    A.J New Member

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    It's full, but some poured off when it bubbles.
     
    #5 A.J, Dec 14, 2023
  6. A.J

    A.J New Member

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    I got a new error today "OBD Code P261C - Coolant Pump "B" Control Circuit Low". Could this mean my coolant pump is not working?
     
    #6 A.J, Dec 14, 2023
  7. Eddie25

    Eddie25 Active Member

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    Sounds like it. Assuming there's no connector, wiring, or ECM issues . Were it mine, I'd replace the water pump then monitor temps and coolant level very closely for a while. 120C is way too hot, you'll be lucky if your head gasket survived, but I wouldn't rule it out. If it does turn out to be something else you'd probably want to replace the pump anyways so that's why I'd start there given that code and the symptoms. You want to go OEM (or at least AISIN aftermarket) with the water pump on these cars, from a reputable source.
     
    #7 Eddie25, Dec 15, 2023
  8. Mendel Leisk

    Mendel Leisk Senior Member

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    Freshly purchased, with 192K kms, overheating, "misfire code", there's a decent chance you bought a car with blown head gasket and seller poured a stop-leak product into the engine coolant circuit, to mask symptoms. Head gasket replacement is not trivial btw.

    BTW, using "worldwide" for location doesn't help responders.
     
    #8 Mendel Leisk, Dec 15, 2023
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