check hybrid system light came on

Discussion in 'Gen 3 Prius Technical Discussion' started by bobby515, Nov 25, 2025 at 2:05 PM.

  1. bobby515

    bobby515 Member

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    On my way home today, my check hybrid system light came on. I hooked my my basic cheap Bluetooth scanner.
    I was wondering what codes came up as I was on the way home. I hit clear. They went away. The Car is safely parked.
    Seems like the engine had a smell and was hotter than normal. 240k on it, new OEM water pump. My inverter flow was never able to see if it was running. I think maybe the pump could be bad. I want to get a more advanced code reader tool to check the car out. Any idea. Rebuilt 6 months 6-month-old. 100% don't think it's the battery, as it charges and discharges properly to me.
    Any advice. And what's a basic better black friday code reader to get? Going to load test the regular battery.
    I think it's an inverter or pump..just guessing..new headgasket 1 year..
    I put 60k on the car in 2 years...
    If the inverter is bad, is eBay bad for a used one? Thanks in advance
     
  2. ChapmanF

    ChapmanF Senior Member

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    There are about 200 reasons for "check hybrid system", so if you want to guess you have to be very good at guessing.
     
  3. bobby515

    bobby515 Member

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    Is thier a scanner tool i could be to.narrow it down.??
    Any ideas where to start. I have tools and experience. Just the hybrid is difficult for me.
     
  4. bobby515

    bobby515 Member

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    Question on a gen 3. Invertor plastic tank. With the car running is the fluid supposed to be flowing while car is running. Mine never has. .
     
  5. ChapmanF

    ChapmanF Senior Member

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    Gen 1 and gen 2 used a single-speed pump that's always on whenever the car is IG ON or READY.

    Gen 3 has a pump that runs at variable speed as needed for cooling. So it's harder to check just by looking at fluid in the reservoir.

    As there are around 200 different trouble codes that can give the warning you've got, best next step is to read the trouble code(s). Then you'll know whether the pump even has anything to do with the code(s) present.
     
  6. bobby515

    bobby515 Member

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    Can you recommend a black friday code reader that will give me more info or the type I need. I got the basic cheap $15 Bluetooth one.
     
  7. ChapmanF

    ChapmanF Senior Member

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    Autel AP200 gets pretty good talk around here. I have one and it does the job. I wish it did not require signing in to their cloud (thus requiring an internet connection) every week or so. After you do that, it will keep working for a week or so even if you're on the road with no internet, but I'm sure some day I'll leave on a road trip without remembering to sign in first, and then need it on the side of the road somewhere and it'll say "signin needed". (n)

    Other than that it's pretty great.
     
    Brian1954 and PriusCamper like this.
  8. Brian1954

    Brian1954 Senior Member

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    The Autel AP200 is my recommendation. It can communicate with all 18 or so ECUs in a Gen 3 Prius. What that means is that it is capable of reading all the trouble codes, not just some of them. It can do everything that the Toyota Techstream software can do. The price right now on Amazon is $49.99 + tax. I own this model, and I also have Techstream.

    The following two linked threads are good reading.
    https://priuschat.com/index.php?posts/3248209

    Read post #1 and then scroll down to post #37 in this thread, https://priuschat.com/index.php?posts/3246758