Another head scratcher

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by David Mc, Aug 14, 2025 at 7:43 PM.

  1. David Mc

    David Mc Junior Member

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    I have the Triangle.

    The problem is the car system says both 12v (12.1) and hybrid (14) are ok.
    However the screen shows the batter not charging while driving then eventually kicking into limp mode.
    After getting home and shutting off and checking hybrid it still reads 13.9 to 14.1 restarting car allows me to drive again for a short distance and the screen shows it charging till it kick off again. Usually 4 miles or less.

    Is this the inverter failing or something else as I'm stumped.
     
    #1 David Mc, Aug 14, 2025 at 7:43 PM
  2. Brian1954

    Brian1954 Senior Member

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    Read the trouble codes using a capable scanner.
     
    #2 Brian1954, Aug 14, 2025 at 8:13 PM
    Last edited: Aug 14, 2025 at 8:22 PM
  3. ChapmanF

    ChapmanF Senior Member

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    ^ This.

    Because there are a couple hundred reasons that triangle can be on, it's generally premature to start asking "do I agree with what the car is saying?" before knowing which of 200 things the car is saying.
     
    #3 ChapmanF, Aug 14, 2025 at 8:18 PM
  4. bisco

    bisco cookie crumbler

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    where does the car tell you the hybrid battery is okay?
     
    #4 bisco, Aug 14, 2025 at 8:32 PM
    Brian1954 likes this.
  5. Tombukt2

    Tombukt2 Senior Member

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    The 14 has nothing to do with the hybrid battery buddy
     
    #5 Tombukt2, Aug 14, 2025 at 8:55 PM
  6. bisco

    bisco cookie crumbler

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    what does it have to do with?
     
    #6 bisco, Aug 14, 2025 at 9:02 PM
  7. Tombukt2

    Tombukt2 Senior Member

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    It tells ya the DC to DC converter is producing the voltage to maintain 12V systems . Tells me nothing about the 200Volt DC HV system at all me no think . I mean because it's charging the 12V is not much
     
    #7 Tombukt2, Aug 14, 2025 at 9:08 PM
  8. David Mc

    David Mc Junior Member

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    When you do the car test the MFD gives you the numbers for both the 12v and the hybrid which is where I got my numbers from.

    The only scanner I have is a Harbor Freight OB2 iirc.
     
    #8 David Mc, Aug 15, 2025 at 12:39 AM
  9. T1 Terry

    T1 Terry Active Member

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    12v on a 12v lead acid battery, means all the capacity is gone and the battery is down to 50% SOC ..... 12v battery is in the process of passing over to the other side .....
    The 14v is probably the voltage at the 14v battery with the system on, meaning the DC to DC is applying 14v to the DC circuit.

    T1 Terry
     
    #9 T1 Terry, Aug 15, 2025 at 3:31 AM
  10. dolj

    dolj Senior Member

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    It does no such thing. I'm not sure where that idea has come from, but it is wrong.

    Probably came from AI. LOL.
    ^^^ This. ...
    ^^^ and this.
     
    #10 dolj, Aug 15, 2025 at 5:14 AM
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