Help Me Understand This

Discussion in 'Gen 2 Prius Main Forum' started by qmanqman, Sep 26, 2025 at 4:24 PM.

  1. qmanqman

    qmanqman Active Member

    Joined:
    Mar 29, 2020
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    Location:
    CO
    Vehicle:
    2007 Prius
    Model:
    One
    The other day I was driving up a hill and changed lanes to pass a bunch of slow moving cars. I floored the accelerator and the car didn't have that zip it normally does. As I was almost ready to pass the red triangle of death popped up for a second or two and then went off. The charge meter sat at a single purple bar for quite some time. Even through a long glide downhill that would usually put two bars on it. Plugged in my bluetooth OBDII reader (while still moving) and there were no battery or engine codes. Using the Dr. Prius app the battery bars kept fluctuating from green to yellow and when I'd hit the brakes they'd go red for a second. I noticed the battery 1, 2 and 3 temps were over 100°. Got to my destination where the car sat for about 6 hours.

    When I took off that 6 hours later the battery temps were in the 90s and I heard that fan running the entire 30 minute drive home and occasionally the voltage bars would go yellow for a second.

    Here we are two days later and no more yellow/red bars on the Dr. Prius ap. When I drive the temps start out at outdoor temp and slowly rise to 90° +.

    Questions are these:

    1. Any idea why the red triangle popped on for a second?
    2. The Dr Prius app shows 14 cells. I thought there were 28. What am I missing?
    3. What are the Battery 1, 2, and 3 temps on the Dr Prius app?
    4. Anyone got a quick rundown of that main page of the Dr. Prius app? I don't know what all the fields mean.
     
  2. Tombukt2

    Tombukt2 Senior Member

    Joined:
    Nov 29, 2020
    12,682
    2,264
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    Location:
    Durham NC
    Vehicle:
    2009 Prius
    Model:
    Base
    14 blocks of 2 modules each . So 28 individual prismatic modules. Each module houses 6 cells that we cannot access