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C1241 Help

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Priuslover09, Feb 27, 2020.

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  1. Priuslover09

    Priuslover09 Member

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    Is C1241 the hybrid battery or 12V Battery? C1241 means c1241 high or low battery positive voltage because I got a red triangle on my car this morning and can’t figure it out thanks. 09 Prius.
     
    #1 Priuslover09, Feb 27, 2020
  2. valde3

    valde3 Senior Member

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    #2 valde3, Feb 27, 2020
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  3. Priuslover09

    Priuslover09 Member

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    I tested the voltage and it was to super high do you think it was overcharging the 12v? It tested at 14.2V? Can I discharge it to 12.7V? I have a discharger. The Feels Hot When I Touch It
     
    #3 Priuslover09, Feb 27, 2020
    Last edited: Feb 27, 2020
  4. valde3

    valde3 Senior Member

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    That's all normal. You need to test the 12V battery with the Prius turned off. Your discharger feels hot?
     
    #4 valde3, Feb 27, 2020
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  5. SFO

    SFO Senior Member

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    If the 12v battery is that hot, then the battery is most likely failing and has at least one bad cell.
     
    #5 SFO, Feb 27, 2020
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  6. Priuslover09

    Priuslover09 Member

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    Does it need to be replaced or discharged. to 12.7v?
     
    #6 Priuslover09, Feb 27, 2020
  7. SFO

    SFO Senior Member

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    Like @valde3 kindly mentioned above, test the battery when the vehicle isn't charging it (eg. OFF).

    The reading of 14.2 volts is because you were testing the battery while the vehicle was "ready" or "on".

    You'll most likely be replacing it, so take the battery to an auto parts chain store and have them test it, either in or out of the vehicle.
     
    #7 SFO, Feb 27, 2020
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  8. Priuslover09

    Priuslover09 Member

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    I can do that tonight I’ll take it autozone tonight
     
    #8 Priuslover09, Feb 27, 2020
  9. Priuslover09

    Priuslover09 Member

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    So I got the 12v replaced at auto-zone than I went to chick-fil-a for supper then I got back in the car and drove less then 2 miles and the light and came back on with the same code c1241 any ideas?
     
    #9 Priuslover09, Feb 27, 2020
  10. SFO

    SFO Senior Member

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    Did they check the battery health before replacement?

    Ok, assuming the new battery is within normal voltage range [Step #2 in the above workup, and the manual claims standard is 10-14v], continuing on to the next step (#3), on page 6 of 8 in the above workup for DTC C1241, it tells you to now "CHECK BRAKE CONTROL POWER SUPPLY".
     
    #10 SFO, Feb 27, 2020
  11. Priuslover09

    Priuslover09 Member

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    It was at 12.8V when I just checked it.
     
    #11 Priuslover09, Feb 27, 2020
  12. Priuslover09

    Priuslover09 Member

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    Do u think it’s the charging system?
     
    #12 Priuslover09, Feb 27, 2020
  13. Priuslover09

    Priuslover09 Member

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    Ok it’s the charging system I believe because the hybrid Battery isn’t charging either I don’t have the hybrid battery code but my car hv battery went down 1 bar when driving today
     
    #13 Priuslover09, Feb 28, 2020
  14. valde3

    valde3 Senior Member

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    Is your discharger still getting hot?
     
    #14 valde3, Feb 28, 2020
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  15. Priuslover09

    Priuslover09 Member

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    It was the 12v getting hot not the discharger
     
    #15 Priuslover09, Feb 28, 2020
  16. valde3

    valde3 Senior Member

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    So you have normal charge voltage (14.2v) and 12v battery gets hot. That has to be a bad 12v battery. Just replace it and your Prius is fixed.
     
    #16 valde3, Feb 28, 2020
  17. Priuslover09

    Priuslover09 Member

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    I did it was autozone replaced it. It still got the trinagle after 10 minutes of driving battery was still hot Thee hybrid drained to 1 bar.
     
    #17 Priuslover09, Feb 28, 2020
  18. valde3

    valde3 Senior Member

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    New battery has to also be bad or you measured the voltage wrong.
     
    #18 valde3, Feb 28, 2020
  19. Priuslover09

    Priuslover09 Member

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    U mean they gave a bad battery again?
     
    #19 Priuslover09, Feb 28, 2020
  20. valde3

    valde3 Senior Member

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    Check the charging voltage. If that's correct and battery is getting hot then it has to be a bad battery.
     
    #20 valde3, Feb 28, 2020
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