P0A80 Code On 2009

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Charles2009Prius, Jan 15, 2021.

  1. Charles2009Prius

    Charles2009Prius New Member

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    Hey I’m Charles. I Have The Prius 2009 With 107,988 Miles I Had The Car Sit 16 Days The Car. I Gotten The Red Death Triangle. I’m Thinking Hybrid Battery? Battery Won’t Charge Past The Purple Bars. My Mechanic Tells Me These Codes.

    P0A0F

    P3000

    P0A80

    P0AFA

    B1421

    B1423

    12V 12.30 OFF 13.90 ON

    BB1 17.60

    BB2 17.69

    BB3 17.62

    BB4 -24.99

    BB5 -2.00

    BB6 17.56

    BB7 17.69

    BB8 17.70

    BB9 17.64

    BB10 17.75

    BB11 17.72

    BB12 15.59

    BB13 17.80

    BB14 17.40

    RR1 0.18

    RR2 0.18

    RR3 0.18

    RR4 0.18

    RR5 0.18

    RR6 0.18

    RR7 0.18

    RR8 0.18

    RR9 0.18

    RR10 0.18

    RR11 0.18

    RR12 0.18

    RR13 0.18

    RR14 0.18
     

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    #1 Charles2009Prius, Jan 15, 2021
    Last edited: Jan 15, 2021
  2. bisco

    bisco cookie crumbler

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    welcome!

    does your mechanic specialize in hybrids? does she have toyota techstream diagnostic software?

    it could be the battery, or it could be the 12 volt, or it could be something else
     
  3. jerrymildred

    jerrymildred Senior Member

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    Welcome. Besides what @bisco mentioned, it might be corrosion in the battery's wiring harness. Those negative voltages look to me like bogus readings from bad connections. BB12 looks low, too.

    You'll want to make sure your mechanic is Prius competent.
     
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  4. Charles2009Prius

    Charles2009Prius New Member

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    He has worked on hybrid cars before but I’m not sure if he ever done prius battery but he has Toyota software techstream
     
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  5. bisco

    bisco cookie crumbler

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    that should give him the module voltages under load, and any that are outside parameters
     
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  6. Charles2009Prius

    Charles2009Prius New Member

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    Any options on battery? Is the 17V ok for battery and is Resistance 18 ok for battery I heard from my mechanic guy 12v must be 12.49v off and 13.89V On or higher for car to run the computers is that true?
     
  7. jerrymildred

    jerrymildred Senior Member

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    Those 17 V numbers are for the traction battery. The 12V numbers you give here are for the Aux 12V battery. They are totally different batteries with totally different purposes, locations, chemistries, and voltages.

    Not true at all. Even if the 12V gets down under 11V it should still power up. My brake pump was running for an unusually long time on my 2005 several years ago. It was the only symptom that my 12V was down to about 10 volts.

    And the "13.89" when on isn't measuring the battery. It's measuring the output of the DC/DC converter that's charging the 12V battery.

    It's true that a low 12V can throw codes due to insufficient voltage to the ECUs and sensors, but 12.5V in the morning is not unusual at all. If there's any doubt, put it on a charger overnight and read the codes again.
     
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  8. Charles2009Prius

    Charles2009Prius New Member

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    Ok so where can I get my hybrid battery worked at? Again my 12v was at 12.30 OFF 13.90 ON and I know my hybrid battery was at 17v is it ok for that? Is what I’m asking. My Resistance was at 0.18. I have a weak cell and a I think a wiring problem you said for two other cells.
     
    #8 Charles2009Prius, Jan 17, 2021
    Last edited: Jan 17, 2021
  9. AzusaPrius

    AzusaPrius Active Member

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    Since you have all the codes written down, just reset and clear the codes.

    Then drive car around for a good drive. Go down hills if you can and lightly keep your foot on the brake.

    Use the brake pedal more than gliding to a stop.

    That should charge the hybrid battery back up and if it throws codes again check them and you may have to replace some cell modules.

    Check ebay out, you can find them for like $25 each.

    Posted via the PriusChat mobile app.
     
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