Prius prime missing message battery block A

Discussion in 'Prime Main Forum (2017-2022)' started by confusedcole..., May 29, 2026 at 12:12 AM.

  1. confusedcole...

    confusedcole... Junior Member

    Joined:
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    Location:
    Humboldt county
    Vehicle:
    2008 Prius
    Model:
    ----USA----
    IMG_1314.jpeg IMG_1316.jpeg IMG_1315.jpeg IMG_1317.jpeg IMG_1318.jpeg IMG_1319.jpeg IMG_1320.jpeg IMG_1314.jpeg IMG_1316.jpeg IMG_1315.jpeg IMG_1317.jpeg IMG_1318.jpeg IMG_1319.jpeg IMG_1320.jpeg IMG_1321.jpeg IMG_1322.jpeg IMG_1314.jpeg IMG_1316.jpeg IMG_1315.jpeg IMG_1317.jpeg IMG_1318.jpeg IMG_1319.jpeg IMG_1320.jpeg IMG_1321.jpeg IMG_1322.jpeg IMG_1314.jpeg IMG_1316.jpeg IMG_1315.jpeg IMG_1317.jpeg IMG_1318.jpeg IMG_1319.jpeg IMG_1320.jpeg IMG_1321.jpeg IMG_1322.jpeg IMG_1314.jpeg IMG_1316.jpeg IMG_1315.jpeg IMG_1317.jpeg IMG_1318.jpeg IMG_1319.jpeg IMG_1320.jpeg IMG_1321.jpeg IMG_1322.jpeg IMG_1314.jpeg IMG_1316.jpeg IMG_1315.jpeg IMG_1317.jpeg IMG_1318.jpeg IMG_1319.jpeg IMG_1320.jpeg IMG_1321.jpeg IMG_1322.jpeg IMG_1314.jpeg IMG_1316.jpeg IMG_1315.jpeg IMG_1317.jpeg IMG_1318.jpeg IMG_1319.jpeg IMG_1320.jpeg IMG_1321.jpeg IMG_1322.jpeg My Prius prime recently was attack my rodents and chewed some of high voltage wires and low voltage around hv battery in the rear seat. Some of the low voltage is back there which I’m not sure if is chewed through as well. Can someone tell me what these pictures of the low voltage might be behind the rear seat? I have a few codes but mainly missing message from battery block A and others I’ll show in pictures. Any help is greatly appreciated thank you. I replaced some of the high voltages wires that were originally damaged but still getting hv system malfunction errors. Everything inside the battery casing looks fine as well.
     
    #1 confusedcole..., May 29, 2026 at 12:12 AM
  2. confusedcole...

    confusedcole... Junior Member

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    Location:
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    Vehicle:
    2008 Prius
    Model:
    ----USA----
    Sorry for all the repeated pictures I don’t know what happened there
     
    #2 confusedcole..., May 29, 2026 at 12:13 AM
  3. ChapmanF

    ChapmanF Senior Member

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    Model:
    IV
    The message isn't about battery block A, it's about battery energy control module A: in other words, the thing that has also been called the battery smart unit, battery voltage sensor, or (in some older generations) the battery ECU.

    Because U0 codes all have descriptions standardized by SAE, they tend to give things more generic names (like battery control module A, in case some car somewhere might have more than one) instead of the familiar names you find in the car's repair manual.

    The C1 codes you have are just because of that hybrid-system code.

    C1 codes are defined by individual car manufacturers instead of by SAE, which comes with its own kind of problem. Where an SAE-defined code might have kind of a generic-sounding description and it's up to you to figure out what it's talking about in this car, a manufacturer-defined code can have a bunch of different, unrelated descriptions, from different car makers using the same code to mean completely different things. The cheaper scan tools will just show the code with all of the descriptions it's ever had in any car, and it's up to you to ignore the ones (like "active booster solenoid") that have nothing whatsoever to do with a Prius.
     
    #3 ChapmanF, May 29, 2026 at 10:05 AM
    Last edited: May 29, 2026 at 10:11 AM
  4. confusedcole...

    confusedcole... Junior Member

    Joined:
    Sep 19, 2024
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    Location:
    Humboldt county
    Vehicle:
    2008 Prius
    Model:
    ----USA----
    Is there a step in ecu repogramming of these newer prius' of some sort after there is a hv system fault? I have re looked over all my connections/wiring and everything seems to be fine accept for that back seat low voltage which i assume just goes into seatbelt warnings and/or seat heaters etc.
     
    #4 confusedcole..., May 29, 2026 at 10:22 AM
  5. ChapmanF

    ChapmanF Senior Member

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    Vehicle:
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    IV
    #5 ChapmanF, May 29, 2026 at 10:47 AM
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