Battery or Inverter or Inverter pump?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Matt2239, May 18, 2025.

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  1. Matt2239

    Matt2239 New Member

    Joined:
    May 18, 2025
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    Location:
    Washington, DC
    Vehicle:
    2007 Prius
    Model:
    N/A
    Patient is a 2007 Prius base trim model with 145,000 miles. Recently developed red triangle, yellow engine light, yellow VSR light, round yellow light that looks like a drum brake with an exclamation point inside (I should be so lucky). These lights never reset to black. Scares the living hell out of the middle schooler who sees a school bus in his future.

    Car starts out charging the battery with green and yellow arrows. Quits charging with a dramatic thunk and kicks into high RPMs and low acceleration. Green and yellow arrows go dark. Back seat fan roars to life. After a shutdown of only a grocery store's visit, all's well again. For about five minutes. Battery won't hold a charge but can charge from purple to green and back to purple in no time.

    I'm aware there's a fail-safe that shuts down the charging stuff if a heat sensor begins thinking that the battery is catching fire, even if it isn't, preventing an over-charging scenario. But if I have both an inverter and a battery problem, or, even worse yet, an inverter, battery, and inverter pump problem, then it might be time to pull the plug.

    I sent the codes to a shade tree mechanic, and he went straight for battery replacement despite the sensor codes. But that's not conclusive. Even though he knows you know where he sleeps, the shade tree mechanic might just be making an honest error.

    Patient diagnostics (OBDocker)

    P3000 - Battery malfunction
    P08A80 - Battery deterioration
    P0A9C - Sensor A malfunction
    P3013 - Battery block 3
    P3014 - Battery block 4
    Inverter pump fluid flowing well

    Questions?
     
    #1 Matt2239, May 18, 2025
  2. Brian1954

    Brian1954 Senior Member

    Joined:
    Jan 31, 2021
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    Location:
    South Central PA, USA
    Vehicle:
    2011 Prius
    Model:
    III
    It is time for a hybrid battery replacement.

    None of the codes you listed have anything to do with the inverter or inverter cooling pump. They are all for the hybrid battery.
     
    #2 Brian1954, May 18, 2025
  3. Tombukt2

    Tombukt2 Senior Member

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    Nov 29, 2020
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    Location:
    Durham NC
    Vehicle:
    2009 Prius
    Model:
    Base
    There's no questions here but all of the answers. You can go look at the sensors in the battery and test them and see that they're connected more than likely you're going to see lots of corrosion at the other end where the sensors connect to the system and much corrosion on bus bars nuts and everything else that's holding the battery together to make the voltage that it makes that's what all those codes are about everything else on your car doesn't have a code yet or you haven't posted it so if that's all the codes you got that's what all those lights are about and that is correct that's why the hybrid battery fan is running full tilt it thinks it's going to crap . So the fans on it has nothing to do with fires it just believes that it might be getting hot and what have you because the sensors A and b or whatever it said above there are not doing their due or it's not getting sent to the computer so the computer setting a code so some human has to look at them and that doesn't happen from the driver's seat
     
    #3 Tombukt2, May 18, 2025
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