08 prius keep dying

Discussion in 'Gen 2 Prius Main Forum' started by richard203, Oct 16, 2025 at 10:33 PM.

  1. richard203

    richard203 Member

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    after green bean replaced the hybrid battery and i drove it for few blocks the Prius died on me. No power or anything. steering and a/c works. all light came on. i just have to turn off the car and turn it back on and it works again and then after a few block it dies again. No light on when the car is running.
     
  2. dolj

    dolj Senior Member

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    ... and when the car dies?

    What codes do you read when you scan the car when it "dies" like this?
     
  3. richard203

    richard203 Member

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    i'll try to get the code when i test drive it tomorrow. is there anything that will make it die like this? without giving me codes? i have replaced the 12v battery before the hybrid battery got changed.
     
  4. jacktheripper

    jacktheripper Senior Member

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    This sounds very weird, use Dr. Prius App to find out the error code, you are going to need compatible OBD2 adapter like these:

    Panlong OBD2 adapter:
    https://amzn.to/3rkAV9G

    iCar Pro 2S:
    https://amzn.to/476vpsl

    Viecar
    https://s.click.aliexpress.com/e/_oFWSWYm

     
  5. richard203

    richard203 Member

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    bisco likes this.
  6. Tombukt2

    Tombukt2 Senior Member

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    Stay on you're street what's display look like at storage and at boot in morning?
     
  7. richard203

    richard203 Member

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    what you mean by storage?
     
  8. Tombukt2

    Tombukt2 Senior Member

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    Wen you put it up at night say green in America at boot it's ????! Lo blue ? Magenta ? The battery colors in energy monitor.
     
  9. richard203

    richard203 Member

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    my MFD is out so I cant see it
     
  10. richard203

    richard203 Member

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    So I was moving the car since it’s street cleaning the cel light came on but the car did not die. Here’s the code
     

    Attached Files:

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  11. Aegean

    Aegean Active Member

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    Inverter coolant pump?
     
  12. richard203

    richard203 Member

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    wont that give a inverter pump code? do you think its the brake switch?
     
  13. Aegean

    Aegean Active Member

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    You can research the inverter coolant pump symptoms in this forum. Good chance this is the main issue. A simple test is to disconnect the electrical connector for the pump when the car dies (while checking the 15 amp AM2 fuse). If the car works again, that is your issue but do not test it long without a working pump.
     
  14. richard203

    richard203 Member

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    can u unplug it while the car is running and see if it dies?
     
  15. Aegean

    Aegean Active Member

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    I believe is the opposite. When you disconnect it, the car works fine again but will increase inverter coolant temperature so just do it for just a few minutes for testing. Basically a broken pump shorts to ground intermittently creating these electrical issues.
     
  16. dolj

    dolj Senior Member

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    No. There is no code for a dead inverter coolant water pump. The water pump and the radiator cooling fans both become suspect when you get an "Inverter is Too Hot" code, P0A93. More often, you get that code because it is the pump has died, but you should not automatically rule out the radiator fans either.
    No. P1242 is about 12-volt power arriving at the IG2 input to the ABS ECU. There could be many causes for that, so going through the diagnostic tree for that code is advisable.
    Yes, you can unplug both while the car is running. The car will not "die" by just unplugging the inverter coolant water pump. It should "die" if you remove the AM2 fuse.
     
  17. richard203

    richard203 Member

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    so if i remove the AM2 fuse and it dont die thats mean its a bad inverter pump?
     
  18. dolj

    dolj Senior Member

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    No. It just means the fuse is not the problem, and if the car does not die, then you've got a weird conundrum. The car should die when you remove the fuse, which proves the fuse is good. You could also prove the fuse is good by using an ohmmeter to check for continuity.

    Following the diagnostic tree in the repair manual for the code is the best way to narrow down the problem.

    Your codes don't implicate the water pump in any case, but you can rule it out quite easily by checking the coolant reservoir for fluid movement. If there is no movement with the car IG-ON (two presses of power with foot OFF the brake) or READY (one press of power with foot ON the brake), then the pump is not working.
     
    #18 dolj, Oct 17, 2025 at 10:16 PM
    Last edited: Oct 17, 2025 at 10:27 PM