Question about error message,"Check Hybrid System"

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Sylvio Briffa, May 6, 2017.

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  1. Sylvio Briffa

    Sylvio Briffa Junior Member

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    Working on the shocks yesterday, I had to disassemble all the trim panels to access the shock absorbers. I disconnected the negative cable to my 12 volt battery for safety. Having heard on the chat that I should clean the battery cooling blower fan, I decided to remove the high voltage safety plug. I removed the blower and cleaned it out and reinstalled it and left all the trim panels off. I reinstalled the high voltage plug and 12 volt battery. When I turned the car on, it would not engage in drive or reverse. It would go to neutral. On the dash board the message said, "Check Hybrid System." Any ideas out there what can be going on? Signed disparate owner.
     
    #1 Sylvio Briffa, May 6, 2017
  2. tankyuong

    tankyuong Senior Member

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    reset by turning on and off your car 3x
     
    #2 tankyuong, May 6, 2017
  3. Raytheeagle

    Raytheeagle Senior Member

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    Are you sure you seated the orange safety plug and locked it? That's a typical issue upon reinstall.
     
    #3 Raytheeagle, May 6, 2017
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  4. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Most likely the high voltage interlock was not correctly installed. On G2 for example, after the lever is pivoted 90 degrees it must be slid to be locked in place.
     
    #4 Patrick Wong, May 6, 2017
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  5. Mendel Leisk

    Mendel Leisk Senior Member

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    Just to pile on: it's probably that orange plug on the hybrid battery.

    I disconnect nothing before cleaning that fan, no problems.

    Disconnecting the 12 volt in particular is a bit of a pain, if not warranted: you lose radio presets, trip meters, and maybe the window auto-up function needs re-learning.

    Also, in my experience at least: a 12 volt disconnection causes the car to act a bit strange for the next drive or two, doing odd revving-up, as if it's recalibrating.

    Sometimes you absolutely should disconnect 12 volt, but I don't think this is one of those cases.
     
    #5 Mendel Leisk, May 6, 2017
    Last edited: May 6, 2017
  6. Sylvio Briffa

    Sylvio Briffa Junior Member

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    Could a dead or discharged 12V battery cause it not to start?
     
    #6 Sylvio Briffa, May 6, 2017
  7. Sylvio Briffa

    Sylvio Briffa Junior Member

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    I installed it properly
     
    #7 Sylvio Briffa, May 6, 2017
  8. Raytheeagle

    Raytheeagle Senior Member

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    Does the "ready" message display? How old is the 12v? Has it ever been discharged (light left on, door not closed, etc)?
     
    #8 Raytheeagle, May 6, 2017
  9. ericbecky

    ericbecky Hybrid Battery Hero

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    Even though missing the last of three steps when replacing the orange plug is very common.
    We will have to defer to your assessment that you, indeed did all three steps:
    Step 1) Insert plug
    Step 2) Swing handle upwards
    Step 3) (often missed) SLIDE THE HANDLE VERTICALLY DOWNWARDS UNTIL YOU HERE IT CLICK.
    Here is Carolyn's video showing the 3 step process.


    Other things to check
    Did you plug both of the fan harnesses back together?
    1) Smaller Plug on the back of the fan itself.
    2) Wider white plug to the upper right of the fan.

    As a prank I've unplugged those before.
    It disables the car. :) Heh.

    Otherwise take a moment to scan the vehicle to obtain the error code.
    It will tell you what is wrong... such as P0A0D - High Voltage System Interlock Circuit High.
    (o.k., o.k. I won't mention that again)
     
    #9 ericbecky, May 6, 2017
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  10. bisco

    bisco cookie crumbler

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    yes, a bad 12v will prevent starting.
     
    #10 bisco, May 6, 2017
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