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Should the “Cooling Performance of the Hybrid Battery is Low” warning stay on after cleaning?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Rich Fife, Aug 21, 2024 at 12:43 PM.

  1. Rich Fife

    Rich Fife New Member

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    My wife's 2015 Prius threw this warning about a week ago and I removed about 1/4 inch of lint from the filter. She doesn't drive much.

    Does that warning go off by itself? Can/should I clear it with tech stream? How long does it take?
     
    #1 Rich Fife, Aug 21, 2024 at 12:43 PM
  2. Mendel Leisk

    Mendel Leisk Senior Member

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    Did you clean the fan and the ductwork leading to it? If you had that much link on the inlet filter, the rest is likely pretty snowed in as well.

    See video 21 here:

    Nutz About Bolts Prius Maintenance Videos | PriusChat

    But do take a look at this first:

    HV Battery Fan Cleaning | PriusChat

    ^ in a nutshell: no need to remove rear seat.

    Also, you CAN clean the fan without removing it; just getting down to it, but leaving it plugged in and bolted down, you can clean it fine say with Q-Tips. Don't make more work for yourself.
     
    #2 Mendel Leisk, Aug 21, 2024 at 4:29 PM
    Last edited: Aug 21, 2024 at 4:38 PM
  3. Rich Fife

    Rich Fife New Member

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    Thanks! Do you happen to know if the “Cooling Performance of the Hybrid Battery is Low” warning stays on after cleaning? Is there a time delay or does it go right off?
     
    #3 Rich Fife, Aug 21, 2024 at 7:07 PM
  4. Mendel Leisk

    Mendel Leisk Senior Member

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    Not sure. I suspect it'd go away after you've driven a bit, after cleaning fan and ductwork. Assuming that's the issue. It often is.

    So the filter you cleaned is right at the seat back, at the air intake grill for hybrid battery?
     
    #4 Mendel Leisk, Aug 21, 2024 at 9:20 PM
  5. ASRDogman

    ASRDogman Senior Member

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    If the fan is/was clogged, the battery may be clogged.
    You might have to take the top off and blow out the battery, in reverse, toward the fan.
    It could be blocked between the battery modules. That's why the warning won't clear.
    Have you tried unplugging the 12v battery for several minutes.

     
    #5 ASRDogman, Aug 21, 2024 at 9:54 PM
  6. Mendel Leisk

    Mendel Leisk Senior Member

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    Are you regularly transporting pets?
     
    #6 Mendel Leisk, Aug 21, 2024 at 10:32 PM
  7. MAX2

    MAX2 Junior Member

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    Afterwards, clear the DTCs to reset the learning values even if no DTCs are stored.
     
    #7 MAX2, Aug 22, 2024 at 12:28 AM
  8. bisco

    bisco cookie crumbler

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    could be inside the battery too, how many miles on her?

    did you check the fan connector for corrosion?
     
    #8 bisco, Aug 22, 2024 at 2:17 PM
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