2010 Prius maybe bad inverter need advice

Discussion in 'Gen 3 Prius Technical Discussion' started by TimStL, Jun 30, 2020.

  1. TimStL

    TimStL New Member

    Joined:
    Nov 18, 2019
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    Location:
    St. Louis Missouri
    Vehicle:
    2007 Prius
    Model:
    N/A
    Spent my miserably tiny life savings on a 2010 Prius not running. The guy said all it needed was a battery but I’ve since come to understand that was this car’s “symptom” not the disease. It wasn’t charging so he put a used inverter in it but not before driving so long on battery only that he fried all the cells. So I replaced battery (Not just cells while battery) with a working rebuilt (was tested for 30mins and worked in another gen3). The engine shakes then stops like it’s constantly trying to engage but being jarringly halted.

    Things I’ve done:
    -changed all fuses (light white corrosion on many of them) and the
    relay integration
    -changed engine control ECU
    -changed transmission computer control module -changed power supply control
    (no effects from changing any of those)

    Below are my current codes from tech stream.
    *link to photos from current TecStream health check (also shows pending and historic codes)

    P2237: Oxygen (A/F) Sensor pumping circuit / open (for A/F sensor) (Bank 1. Sensor 1)

    P0B4C: Hybrid battery voltage sensor “D” circuit low

    P3000: Battery Control System

    C1259: HV control system regenerative malfunction

    C1310: HV System Malfunction

    I’m incredibly appreciative of any community assistance in this. I know a little about cars -clearly nothing enough. I am just a guy trying to reclaim the lost American optimism of believing in fixing the things in his life that are broken.
     
  2. PriusCamper

    PriusCamper Senior Member

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    Location:
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    Vehicle:
    2007 Prius
    Model:
    Two
    Pulling your hybrid battery pack for full cleaning, testing and inspection is going to need to be done eventually. If you're lucky the voltage sensing harness that plugs into Battery ECU has corrosion and P3000 goes away once you address that... As for P0B4C I'm thinking that error code is specific to Gen3 hybrids, as it's not showing up in my Gen2 repair directions...

    Also with early model Gen3 it's essential to clean out the EGR system and valve regularly to avoid a blown head gasket. You can also get an oil catch can to add to the system to limit the risk even further.
     
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  3. TimStL

    TimStL New Member

    Joined:
    Nov 18, 2019
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    Location:
    St. Louis Missouri
    Vehicle:
    2007 Prius
    Model:
    N/A
    Thanks for the reply! I didn't know about the issues with the EGR system. I'm definitely going to pull that pipe and inspect it. It's current condition should tell me something about the level of abuse the engine was in before it stopped running.

    The P0B4C is apparently related to: Faulty Battery smart unit or Faulty HV battery assembly
    This felt like low handing fruit on my list of codes to chase down. I had 2 other battery smart units (ECU box that sits in the HV battery sled) so I tried each of them along with new buss bars, terminal connections, terminal connections. in the end I changed everything but the piece of metal the battery components sit on and I've still got this code.
     
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  4. PriusCamper

    PriusCamper Senior Member

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    Location:
    Pacific Northwest, USA
    Vehicle:
    2007 Prius
    Model:
    Two
    Yes... That code is not in my Gen2 manual... How long does it take for code to come back after you clear it?
     
  5. TimStL

    TimStL New Member

    Joined:
    Nov 18, 2019
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    Location:
    St. Louis Missouri
    Vehicle:
    2007 Prius
    Model:
    N/A
    So I cleared codes this morning (disconnected 12v 2mins) and rescanned a couple of times

    P0B4C-123 was there again immediately (Like the dash lit again during the clear process)

    P3000-388 this actually stayed away until my second scan
     
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