2012 Prius V Wagon Issues After Safety Software Update

Discussion in 'Prius v Main Forum' started by hellonearth, Jun 29, 2019.

  1. hellonearth

    hellonearth Junior Member

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    My 2012 Prius V Wagon has been having issues since the safety software update. I first noticed the car selectively (hit or miss) going in EV mode even after driving over 30 miles on the freeway so its not a matter of the engine and or fluids not heating up. The EV light also rarely lights up while before it was fine. It idles a lot without going in EV mode.

    More worrisome is the intermittent acceleration cutting out recently with the warm weather (85F Plus). I have been having scary on and off acceleration issues with the AC on when the car will decide not to accelerate until I turn the AC off even if i floor it. When I turn the AC back on, the car would slow down again. This happens occasionally and usually when the it is quite hot outside.

    Anyone else experienced similar issues or can point me to another thread. I love the car and it only has 92K miles on it but the acceleration cutting out is quite scary and a safety issue especially on the freeway. Thanks!
     
    #1 hellonearth, Jun 29, 2019
    Last edited: Jun 29, 2019
  2. Air_Boss

    Air_Boss Senior Member

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    What software update campaign number are you referring to? Not aware of a “safety” update, though there have been two hybrid system firmware updates since 2016.
     
  3. hellonearth

    hellonearth Junior Member

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    It is the most recent hybrid system update that supposedly prevents the Prius from stalling. I will try to find the paperwork and post the number
     
  4. bisco

    bisco cookie crumbler

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    sounds like the inverter diode update to limit accretion to prevent overheating

    clean the battery cooling fan and grille

    check the 12v health

    clean the egr circuit

    check the inverter fluid movement
     
  5. hellonearth

    hellonearth Junior Member

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  6. Air_Boss

    Air_Boss Senior Member

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    That's interesting. Seems to confirm earlier concerns that there may be a long tail on the inverter problem.
     
  7. cnc97

    cnc97 Senior Member

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    How many miles have you put on since the software update? Mine acted “differently” for a couple hundred. Then it settled back into what I remembered before the update.
     
  8. hellonearth

    hellonearth Junior Member

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    Took it to the stealership where it cost nearly $700 to replace the intake manifold, clean the EGR and replace the spark plugs. He said it was all carboned up and was throwing a lot of codes. I thought price was on the high side but I bit the bullet as we are moving and I needed the car fully functional. Isn't there a TSB or some other warranty on these issues. Mine is a 2012 with 92K miles and I bought it used so not even sure if i would be covered.
     
  9. Air_Boss

    Air_Boss Senior Member

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    Were all the inverter TSBs done?
     
  10. hellonearth

    hellonearth Junior Member

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  11. bisco

    bisco cookie crumbler

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    plug your vin into the toyota owners website. it will give you all the warranty recalls. some gen3 had an intake manifold recall
     
  12. Air_Boss

    Air_Boss Senior Member

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    No manifold recall on the v.
     
  13. tommy Wang

    tommy Wang Junior Member

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    i have been at Hybrid pit and notice many of the 3rd gen Prius are going in for EGR cleaning, many of 3rd gens have at least 90K to 100K miles on them and due to the hot weather many of them are experiencing inverter issues. i guess i will be looking forward to that when my car hits the mileage
     
  14. Mambo Dave

    Mambo Dave New Member

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  15. Air_Boss

    Air_Boss Senior Member

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    Quote from a previous article: “Hogan, however, contends Toyota is trying avoid a multibillion-dollar replacement program for the defective inverters.” Hmmm....
     
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