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CodesC1259, C1310 (shift lever position fail), P3000-123 & 256, B1421, & P3020 block ten weak 15.51v

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by JokesonAnthony, Oct 3, 2023.

  1. JokesonAnthony

    JokesonAnthony New Member

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    Hi everyone,

    I bought a 07 Prius a couple days ago as is and it drove fine, but a little later these codes popped up along with the red triangle, brake system alert, VSC, and check engine. I have checked the inverter fuse, & the coolant is flowing. Does anyone have any suggests of further diagnostics I can do. Could it be the HV ECU and harness? Any leads or pointers to other threads would be helpful thank you!
     
    #1 JokesonAnthony, Oct 3, 2023
  2. bisco

    bisco cookie crumbler

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    #2 bisco, Oct 3, 2023
    JokesonAnthony likes this.
  3. mr_guy_mann

    mr_guy_mann Senior Member

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    So, your first two codes are, "there's a problem with the HV system". Next (P3000) the hybrid control ecu is saying "hey, the HV battery ecu says it has a problem". (B1421 is the A/C ecu complaining that the solar sensor isn't in direct sunlight - ignore it).

    Then we get to P3020 set by the HV battery ecu. Block 10 voltage is "too different " from the other blocks for "too long".

    What are you using for a scantool? You will want to monitor block voltages while driving the car to see what is happening - esp during moderate to hard accel and braking.

    Normally voltage differences don't exceed 0.3V for more than a few seconds. If a cell in a battery module fails, that block voltage will drop by 1.0-1.5V vs others on accel (& will go higher than others on braking).

    Posted via the PriusChat mobile app.
     
    #3 mr_guy_mann, Oct 3, 2023
    Brian1954 likes this.
  4. JokesonAnthony

    JokesonAnthony New Member

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    I am using the Maxi Com MK 808. So it could possibly be that block 10 is bad. I will clear code and monitor block ten.I do have freeze data and it is 15.51 while the others are around 15.7

    thank you
     
    #4 JokesonAnthony, Oct 3, 2023
    Last edited by a moderator: Oct 4, 2023
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