2007 model, hybrid warning light

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by SarcasticFringehead, Jul 5, 2025 at 8:47 AM.

  1. SarcasticFringehead

    SarcasticFringehead Junior Member

    Joined:
    Nov 14, 2021
    24
    1
    0
    Location:
    UK
    Vehicle:
    2007 Prius
    Model:
    N/A
    Last drove the car two days ago locally.

    Drove today on the motorway for just over an hour. Red triangle plus hybrid warning came on.

    I then had to drive for a couple of miles before I could find anywhere to pull up and park.

    The warning lights come on every time I restart the car. It’s not internittent.

    Nothing about the driving experience seemed off. Nothing in the car’s recent history seems like it could have caused this, though what do I know.

    I’m waiting for the tow truck now.

    I don’t have a code reader. I realize that without codes, anything you can tell me is no better than a wild guess.

    But my garage is closed till Monday and I could do with the emotional support. Please come at me with your best most wildest guesses as to the manner and extent of how screwed I am.
     
    #1 SarcasticFringehead, Jul 5, 2025 at 8:47 AM
  2. fragglestickcar

    fragglestickcar Member

    Joined:
    Apr 4, 2018
    83
    43
    0
    Location:
    New York
    Vehicle:
    2006 Prius
    Model:
    II
    Inverter overheat due to a failed pump which might have died during winter but you'd only learn about it in summer. Car largely functional but loses upper-end power.
     
    #2 fragglestickcar, Jul 5, 2025 at 9:05 AM
  3. SarcasticFringehead

    SarcasticFringehead Junior Member

    Joined:
    Nov 14, 2021
    24
    1
    0
    Location:
    UK
    Vehicle:
    2007 Prius
    Model:
    N/A
    Wow! Thanks for that interpretation.

    Assuming you’re right, is it gonna be hell to fix?
     
    #3 SarcasticFringehead, Jul 5, 2025 at 9:08 AM
  4. SarcasticFringehead

    SarcasticFringehead Junior Member

    Joined:
    Nov 14, 2021
    24
    1
    0
    Location:
    UK
    Vehicle:
    2007 Prius
    Model:
    N/A
    Update: the yellow brake system warning light ((!)) is also on. I didn’t notice this before.
     
    #4 SarcasticFringehead, Jul 5, 2025 at 9:37 AM
  5. SarcasticFringehead

    SarcasticFringehead Junior Member

    Joined:
    Nov 14, 2021
    24
    1
    0
    Location:
    UK
    Vehicle:
    2007 Prius
    Model:
    N/A
    Update: following codes came up:

    ABS (Anti-lock Braking System)/VSC (Vehicle Stability Control)/TRC (Traction Control System)

    C1310

    HV System Malfunction

    Current

    ——-

    CCS (Cruise Control)

    P3000

    Battery Control System

    Current

    ——-

    HVB (Hybrid Vehicle Battery)

    P0A84

    Hybrid Battery Pack Cooling Fan 1 Control Circuit Low

    Current

    ———

    HVB (Hybrid Vehicle Battery)

    P0A84

    Hybrid Battery Pack Cooling Fan 1 Control Circuit Low

    History

    ——-

    HC (Hybrid Control)

    P3000

    Battery Control System

    Current

    ——

    HC (Hybrid Control)

    P3000

    Battery Control System

    History

    ——-

    EMPS (Electronic Motor Power Steering)

    U0121

    Lost Communication With Anti-Lock Brake System (ABS) Control Module

    Current

    ——-

    AC (Air Conditioning)

    B1421

    Solar Sensor Circuit (Passenger Side)

    Current

    ——-

    AC (Air Conditioning)

    B1400

    Normal

    History
     
    #5 SarcasticFringehead, Jul 5, 2025 at 10:21 AM
  6. fragglestickcar

    fragglestickcar Member

    Joined:
    Apr 4, 2018
    83
    43
    0
    Location:
    New York
    Vehicle:
    2006 Prius
    Model:
    II
    Yeah, no it's not the inverter pump then.
     
    #6 fragglestickcar, Jul 5, 2025 at 10:22 AM
  7. SarcasticFringehead

    SarcasticFringehead Junior Member

    Joined:
    Nov 14, 2021
    24
    1
    0
    Location:
    UK
    Vehicle:
    2007 Prius
    Model:
    N/A
    I bet it’s corrosion of the hybrid battery from the leak last year. There would have been standing water in there for ages.
     
    #7 SarcasticFringehead, Jul 5, 2025 at 11:29 AM
  8. Brian1954

    Brian1954 Senior Member

    Joined:
    Jan 31, 2021
    1,765
    687
    0
    Location:
    South Central PA, USA
    Vehicle:
    2011 Prius
    Model:
    III
    Code P0A84 is the one that needs to be fixed. Check for corrosion in the electrical connector for the hybrid battery cooling fan. This is a very common problem for a Gen 2 Prius.
     
    #8 Brian1954, Jul 5, 2025 at 12:47 PM
  9. SarcasticFringehead

    SarcasticFringehead Junior Member

    Joined:
    Nov 14, 2021
    24
    1
    0
    Location:
    UK
    Vehicle:
    2007 Prius
    Model:
    N/A
    Thanks for that tip.
     
    #9 SarcasticFringehead, Jul 5, 2025 at 12:49 PM
  10. mr_guy_mann

    mr_guy_mann Senior Member

    Joined:
    Sep 3, 2020
    3,959
    1,907
    0
    Location:
    NJ-USA
    Vehicle:
    2006 Prius
    Model:
    Four
    Specifically, there's a white connector behind the right side interior body panels near the battery fan. It's not uncommon to have a body leak allow water to dribble into that connector and corrode it.

    The repair is to hard splice each wire, eliminating the connector. Then clean and reseal the cracked body sealant around the tailgate hatch frame.
    Screenshot_20240317-213122.jpeg

    Posted via the PriusChat mobile app.
     
    #10 mr_guy_mann, Jul 5, 2025 at 8:44 PM
    Brian1954 likes this.
(You must log in or sign up to post here.)