2012 prius not going into gear with flashing press park icon

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by CraigC, Jul 28, 2025 at 12:21 PM.

  1. CraigC

    CraigC New Member

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    I recently changed the hv battery in my 2012 gen III prius. Afterward it refused to Start/Run. When I try to start I press the start button but the ready does not come on. When I try to put in drive or reverse the press park icon comes on and starts flashing and it beeps continuously and does nothing else. If I press park the light goes off but comes back on if I try to go in drive.
    I read codes with Torque and a dongle. It did have the codes for a comm error to battery but it went away after I cleaned the battery connectors
     
  2. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    safety plug all the way in? you pop it in, flip it closed and then slide it. 3 steps or no joy.
     
  3. CraigC

    CraigC New Member

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    I have 2 safety plugs. Both have been inserted with a three steps. Still no joy.
     
  4. bisco

    bisco cookie crumbler

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    how is the 12 volt health and connections?
     
  5. CraigC

    CraigC New Member

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    More info
    Screenshot_20250730_193650_Dr Prius.jpg Screenshot_20250730_193938_Torque.jpg
     
    #5 CraigC, Jul 31, 2025 at 9:54 AM
    Last edited by a moderator: Aug 1, 2025 at 12:10 PM
  6. CraigC

    CraigC New Member

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  7. CraigC

    CraigC New Member

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    2006 Prius
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    Two
    These images are from Dr. Prius and Torque apps. The current hv battery is the replacement from a wrecked prius. It turned out to also be bad. That is why the group 1 voltage is flat. Overall pack. Voltage is good but capacity is 0.
    The 12 volt supply seems low as well battery voltage is 12.4 measured at battery with multimeter. The meters show the voltage at the ecu and the adapter.
    I have tried to jump the car from the front fuse box connector. No help.

    The battery connectors are clean and tight.
    What is the minimum voltage
     
  8. CraigC

    CraigC New Member

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    Two
    FIXED
    I Repaired the bad hv battery. I put in two good cells from my donor pack and it started right up.