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P0A7A code

Discussion in 'Gen 2 Prius Main Forum' started by Noahlr, Sep 1, 2018.

  1. Noahlr

    Noahlr New Member

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    Location:
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    2008 Prius
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    ----USA----
    2008 with 113000 miles
    All the warning lights came on
    Lost all acceleration while driving
    Car will power up. engine runs for a few seconds and shuts off....will not shift into gear.
    Inverter pump is running as it should.
    12v Battery is new.

    Getting the POA7A CODE
    also got the P2238 CODE once but have not been able to replicate code sense.

    Not sure where to start....any advice would be greatly appreciated.

    Noah
     
    #1 Noahlr, Sep 1, 2018
  2. PriusCamper

    PriusCamper Senior Member

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    Easiest way is to Google the error codes and it'll point you to most popular threads for the repair efforts on here, in this case threads about inverter repair.
     
    #2 PriusCamper, Sep 1, 2018
    Noahlr likes this.
  3. Noahlr

    Noahlr New Member

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    Note.....when starting the engine runs pretty rough then shuts down.
     
    #3 Noahlr, Sep 1, 2018
  4. hill

    hill High Fiber Member

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    Smog / 02 sensors
    either your cat converter died (100k mile warrany - sorry) or if your lucky, it's disconected. The other code is worse ... generator / inverter.
    .
     
    #4 hill, Sep 1, 2018
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  5. Noahlr

    Noahlr New Member

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    Bank 1 sensors 1&2 are both good.
    Bank 1 sensors 1&2 are both good.
    Any ideas on how to test the inverter?
     
    #5 Noahlr, Sep 1, 2018
  6. bisco

    bisco cookie crumbler

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    inverter pump
     
    #6 bisco, Sep 1, 2018
  7. Noahlr

    Noahlr New Member

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    Changed out the inverter with no luck....still same issue/code. Anyone have any ideas on where to start next? Not a lot of info on the web.

    How would I test the transaxle and hvcm?
     
    #7 Noahlr, Sep 2, 2018
  8. PriusCamper

    PriusCamper Senior Member

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    John Kelly did a milliohm meter demo video on youtube. In it he goes into some methods to diagnose a bad electric motor assembly. I suspect, even if you don't have access to one of these meters, it will at least point you in the right direction for more diagnosis:


     
    #8 PriusCamper, Sep 3, 2018
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  9. Noahlr

    Noahlr New Member

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    #9 Noahlr, Sep 3, 2018
  10. Noahlr

    Noahlr New Member

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    I don't have access to a million locally. No one sells them. This is the only step via Toyota tech info that I wasn't able to complete. I'm really hoping it's not the transaxle that's causing the issue.
     
    #10 Noahlr, Sep 3, 2018
  11. PriusCamper

    PriusCamper Senior Member

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    They're a fairly common tool among electrical engineers that work on computer hardware. Also your local community college or university may be able to help...
     
    #11 PriusCamper, Sep 3, 2018
  12. Ricardo Oliveira

    Ricardo Oliveira Junior Member

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    I have the same problem. what was the solution in your case?
     
    #12 Ricardo Oliveira, Jun 9, 2021
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