Solution to 12V issues? Disconnect 12v negative terminal sensor plug

Discussion in 'Gen 5 Prius Main Forum' started by Halcykon, Dec 1, 2025 at 11:28 AM.

  1. VelvetFoot

    VelvetFoot Active Member

    Joined:
    Sep 17, 2025
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    Location:
    New York State
    Vehicle:
    2026 Prius
    Model:
    LE
    Nice chart.

    I took a couple of 22mi/35min drives this afternoon, with a detour for groceries.
    I had OBDC adapter voltage displayed via CarPlay and OBD Fusion.

    It was steady on 14.3/14.4v the entire way. I did take my eye off the road a fair number of times, lol.
    I managed to log the values as well-it backs up my assertion, lol.

    Several OBD Fusion and Car Scanner (both display on CarPlay) notes:

    -Graphing on both are lame
    -OBD Fusion does log files in .csv format, whereas I could not see a way to export data in Car Scanner-perhaps the Pro version?

    For those Gen5'ers who are into it, there's a profile in Car Scanner for '23 and up 'Primes', but I found a lot of stuff works on the LE as well. Do I understand it all? No. But others might. :). I didn't systematically try everything-perhaps I should. Maybe connect to car and do an "all sensors" take some screen pics-see what fields are populated with data. Perhaps that would be most expeditious.
     
    Gokhan likes this.
  2. mva

    mva Member

    Joined:
    Mar 8, 2010
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    Location:
    B.C. Canada
    Vehicle:
    2024 Prius Prime
    Model:
    SE
    On my 2014 F150 the original battery lasted 3 years 10 months. At that point, after a bit of research, I disconnected the current sensor on the negative battery cable and it’s stayed unplugged since 2018. The replacement battery lasted 7 years and still had some life left. It is a well known issue on the F150 forums.

    On my 2024 Prius I am keeping a close eye on the battery and charging rate and it’s been good so far. But, if I start finding it undercharged I will try unplugging the sensor.