2005 Prius - codes P3000-123 and P0A84

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by spycake, Jun 30, 2020.

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  1. spycake

    spycake Junior Member

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    Since you all helped me so well with my 2008 Prius issue a couple weeks ago, my 2005 Prius decided it wanted some attention too. :)

    2005, over 240k miles, no major issues before. A few days ago, the red triangle came on as I was at a stoplight, plus the exclamation mark icon on the MFD. Didn't notice anything unusual as I drove it the last 2 miles home, but I left it alone in the garage for a few days while I acquired a Techstream device. Finally got a reading today and it's giving me two codes: P3000 with INF subcode 123, and P0A84.

    Scouring the forum tells me this:

    P3000 - HV Battery Malfunction
    123
    Input of abnormal signal from battery ECU (HV Battery System Malfunction)

    P0A84: Hybrid Battery Pack Cooling Fan 1 Control Circuit Low

    The only recent issue I had with the car was the 12V battery died about a month ago, not unexpectedly. I replaced it, changed the oil, changed engine and cabin air filters, and drove it for a couple hundred miles with no issue -- until the red triangle and these codes popped up the other day.

    I did also over-fill the gas a bit recently -- darn pump didn't shut off as expected! Nothing spilled out, and it didn't trigger a check engine light or anything, but after that generous fill, I took a day trip of 135 miles and the gas gauge on the dash still said full when I got home. MFD reported ~47 MPG in that time. My next drive was a few days later, a short shopping trip where the red triangle light came on. The gas gauge still says full. Again, it doesn't seem like this would be related to either of those codes, but I figured I should mention it.

    What should be the next step of my testing or experimentation? Or is this beyond the scope of an aspiring DIYer?
     
  2. edthefox5

    edthefox5 Senior Member

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    It wants alot of attention the hybrid battery has failed. Welcome to the club. You owe us membership dues.

    240K is a great run.
     
  3. strawbrad

    strawbrad http://minnesotahybridbatteries.com

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    A P0A84 code does not mean your hybrid battery has failed.

    Leaks are a problem with the hatch on the Gen 2 Prius. A common pathway for the rain to follow is the wiring leading to the battery fan. This then leads to corrosion at a white plastic plug next to the fan. This causes the low voltage warning for the cooling fan.

    Remove the trim panel on the passenger side of the trunk and inspect the battery fan wiring.

    Call me if you need help. I'm in MN.
     
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  4. spycake

    spycake Junior Member

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    Thanks for the tip! Sure enough, during my recent day trip, I drove through some heavy rains (and parked in the rain for awhile too).

    I opened up the back by the battery fan, and there's definitely corrosion on the white plug:


    Any tips on cleaning? According to this other thread, I should pick up some "electrical contact cleaner" and also perhaps something to seal the leak:

    DASH Error Lights Exclamation w/Triangle, VSC, and small Exclamation - Car runs great? | Page 3 | PriusChat
     
  5. spycake

    spycake Junior Member

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  6. JerryScript

    JerryScript Junior Member

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    You should order a new set of male/female connectors to replace those. You can do a quick fix, bypassing the corroded wires using a wire nut, but that should only be temporary till new connectors come in.

    Attempting to clean and reuse those connectors will almost certainly result in more corrosion even without a leak in the future!
     
  7. spycake

    spycake Junior Member

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    Thanks, that sounds like a good plan. Any leads on where to find a part number?
     
  8. JerryScript

    JerryScript Junior Member

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    Hopefully someone here does.

    Finding the correct name for parts has always been a challenge for me, I sometimes have to go to several parts stores/dealerships before my limited vernacular meets someone who can translate it into parts talk!
     
  9. ChapmanF

    ChapmanF Senior Member

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    You can follow along in this post and then this one to see how you get those connector-terminal part numbers out of the wiring diagram. For getting access to that, the wiki page that Elektroingenieur put together has all the details.

    You'll end up somewhere like here, where you'll be able to see the 82998-whatever part numbers for the repair terminals. (Of course this picture is a different example, not the terminals you're looking for.)

    [​IMG]
     
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  10. strawbrad

    strawbrad http://minnesotahybridbatteries.com

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    Yes, Just cut and strip the insulation back to clean wire. Any splice you make will outlast your 15 year old car.

    One solution for the hatch leak is to drill small holes in the low points of the trunk floor. I have seen water collect under the 12 volt battery, under the spare tire, and at the bottom of the driver side fender well.
     
  11. spycake

    spycake Junior Member

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    Thanks for the advice everyone.

    One last question: after I repair/replace the corroded wire, is it best to leave the codes and warning lights and wait for the system to clear them, or should I clear the codes and hope they don't come back? Not sure what the "best practice" is.
     
  12. JerryScript

    JerryScript Junior Member

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    Some codes clear, others remain, I'm not sure about this one. Unless someone else says otherwise, I would clear the specific codes related to this only.
     
  13. spycake

    spycake Junior Member

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    Update: someone gave me a few "bullet connectors" (male/female), so I disconnected the 12V battery, pulled the broken/corroded wire from each side of the battery fan's large white plug, stripped the wire a bit, and stuck it into the bullet connector. I left the other 3 wires in the white plug for now.

    Drove around the neighborhood a bit and no warning lights have come back. I'll keep an eye on it going forward.

    Thanks again for all the help!
     
    #13 spycake, Jul 6, 2020
    Last edited: Jul 6, 2020
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