ECU error code: P3000, P3140, P0A84

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Brando714, Jun 10, 2020.

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  1. Brando714

    Brando714 Member

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    Hello there members. I recently purchased an 04 Prius and did a lot of maintenance to it except for the battery pack. I did buy a bluetooth OBD2 and TorquePro and Dr. Prius (both the paid version). No engine lights are on and no code pops up with OBD2 scanner but after scanning battery life with Dr. Prius, the codes mentioned in the title (P3000, P3140, and P0A84) popped up. Please guide me through what I can do to fix these problems thank you. P.S. I would be posting this same post on the Main Chat as well so sorry if you see this same post on here.
     

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    #1 Brando714, Jun 10, 2020
  2. Aaron Vitolins

    Aaron Vitolins Senior Member

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    Looks like the hybrid battery fan isn’t working properly. Pull the fan and clean it, and inspect the connectors for corrosion.
     
    #2 Aaron Vitolins, Jun 10, 2020
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  3. Brando714

    Brando714 Member

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    You know what? I did recently clean the fan and noticed corrosion on the harness and posted a thread about that. I ended up buyong DeOxyit spray so I will be doing that tomorrow. Thank you very much
     

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    #3 Brando714, Jun 10, 2020
  4. George W

    George W Senior Member

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    Baking soda, water, and an old toothbrush would work better
     
    #4 George W, Jun 11, 2020
  5. Brando714

    Brando714 Member

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    Damn, I received the DeOxyit spray off Amazon for $15 already. I saw a cheaper alternative but the spray can at least lubricates and protects there electric parts as well, not just clean, so I guess in the long run hopefully it'd be worth it. Thanks for your input though. By the way, I used scented baking soda for the interior of my car and vacuumed it the next day because it absorbs bad odor
     
    #5 Brando714, Jun 11, 2020
  6. George W

    George W Senior Member

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    Vinegar or lemon juice on a toothbrush also works with corrosion on terminals, if you're Deoxit runs out. But then you need the baking soda to neutralize the weak acid left behind.
     
    #6 George W, Jun 11, 2020
  7. Aaron Vitolins

    Aaron Vitolins Senior Member

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    Uh I don’t know if I’m seeing this correctly, but the female plug looks so corroded, it has a pin or two stuck in to it. If I so that would totally be an issue!
     
    #7 Aaron Vitolins, Jun 11, 2020
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  8. Raytheeagle

    Raytheeagle Senior Member

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    If nothing else, the corrosion is problematic;).

    Definitely explains a few things(y).
     
    #8 Raytheeagle, Jun 11, 2020
  9. Aaron Vitolins

    Aaron Vitolins Senior Member

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    Definitely! Some spray isn’t going to help that. He very well may have to get a new connector or re wire it.
     
    #9 Aaron Vitolins, Jun 11, 2020
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  10. dolj

    dolj Senior Member

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    Please do not do this. Pick a forum and post once.
     
    #10 dolj, Jun 11, 2020
  11. Brando714

    Brando714 Member

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    UPDATE: Hey guys! So I sprayed DeOxyit to the contacts on the harness I provided the pic with and it worked!!! I did a quick burst on both ends of the contacts, used a toothbrush to kind of brush it off lightly, did another quick burst and then plugged/unplugged about 3-4 times. Using the same Dr. Prius that read the 3 codes, I scanned it again and it is gone now. Just for extra measures, I drove 25 miles on the freeway and rechecked it, and it is still gone. Yay yay!
     
    #11 Brando714, Jun 11, 2020
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  12. fotomoto

    fotomoto Senior Member

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    Unless that spray somehow repaired that connector AND the cause of the corrosion, the codes will come back eventually.

    Judging by your forum activity, it sounds like you want to be very pro-active with this car (and that's a good thing). So, I suggest you determine the state of your HV battery. Is it original, used or what? The best way is to pull a code number of the top of one or more of the modules. It's actually a date code and they should all match. Rebuilts won't.

    GOOD LUCK!
     
    #12 fotomoto, Jun 11, 2020
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  13. Brando714

    Brando714 Member

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    Hi. I purchased the paid version of Dr. Prius and it shows that my battery is at 58.30% fair condition. When I have time, I am going to further look into reconditioning the battery with equipment's to charge/drain I will look into if other's think it will be worth it for my state of battery or to just wait for some time and then swap it out with a reconditioned one
     
    #13 Brando714, Jun 11, 2020
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