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P0A80 & C1657 What to check...

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Mikeykc, Dec 25, 2018.

  1. Mikeykc

    Mikeykc Junior Member

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    2012 Prius v wagon
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    Five
    I cant seem to catch a break. Replaced my engine water pump 2 days ago everything was fine for 2 days and now I have new codes.

    P0A80 replace hybrid battery pack
    C1657 Hybrid powertrain control module

    Battery blocks- sitting overnight in about 35 degree weather
    1- 16.40v 0.024ohm
    2- 16.38v 0.024ohm
    3- 16.31v 0.023ohm
    4- 16.33v 0.023ohm
    5- 16.31v 0.023ohm
    6- 16.36v 0.022ohm
    7- 16.31v 0.022ohm
    8- 16.33v 0.022ohm
    9- 16.31v 0.022ohm
    10- 16.33v 0.023ohm
    11- 16.28v 0.024ohm
    12- 16.33v 0.024ohm
    13- 16.33v 0.024ohm
    14- 16.45v 0.025ohm

    Iv read .3v difference will set the code, is that correct? Can't find any info on C1657 either.
    Any experts plz help.
     
    #1 Mikeykc, Dec 25, 2018
  2. tankyuong

    tankyuong Senior Member

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    I would replace number 11
     
    #2 tankyuong, Dec 25, 2018
  3. TMR-JWAP

    TMR-JWAP Senior Member

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    P0A80 should have freeze frame data available. The freeze frame data should provide additional details so you're not guessing at the problem.

    This fault isn't always caused simply by a module having a low voltage. It can also be triggered by a loss of HV isolation resistance caused by an electrolyte leak. Although a leak will cause a lower resistance, it rarely causes a significant drop in module voltage. You should be able to recognize a leaky module since they usually have a residue at the bottom of the module on the metal base plate, which also causes a dark discoloration. Although it's usually observable at the edges of the modules, sometimes it's hidden under the modules out of immediate sight. In this case, it can usually be seen easily by looking into the plenum under the modules.
     
    #3 TMR-JWAP, Dec 25, 2018
    Last edited: Dec 25, 2018
    jerrymildred and Raytheeagle like this.
  4. bisco

    bisco cookie crumbler

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    how many miles on her?
     
    #4 bisco, Dec 25, 2018
  5. Mikeykc

    Mikeykc Junior Member

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    Five
    2012 148k. Non carb state...
     
    #5 Mikeykc, Dec 26, 2018
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