Check Hybrid System alert after hard acceleration

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by BrianTheLion, Sep 28, 2021.

  1. BrianTheLion

    BrianTheLion New Member

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    Hey y'all. I was driving my 2010 Prius (94,000 miles, bought used ~10,000 miles ago, with original battery) on surface streets a couple days ago and stupidly decided I needed to prove to my friend that Prius's can indeed accelerate quickly, so I stepped on the gas pedal a bit hard. Immediately the Check Hybrid System warning came on along with the master warning light, check engine light, brake system warning light, and stability control light. I still had power and needed to drive home on the highway and made it back, though the car clearly had reduced power and acceleration. It seemed like the battery was still operating based on the mpg reading I was seeing though.

    Any thoughts on what the issue could be? I checked all the fuses under the hood and they looked good (didn't get around to checking the ones under the steering wheel). Also tried turning the car on and off three times. Possibly an issue with the inverter? I haven't noticed any issues with the car or battery recently.

    I would just bring it into the shop but the dealership charges $208 just for a diagnostic and my local hybrid shop wants $175. I also see that getting my own diagnostic tool is an option but am confused if I would be able to get the codes I need with just an OBD2 scanner or if I also need a techstream knockoff to diagnose issues with the hybrid system.
     
  2. tankyuong

    tankyuong Senior Member

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    Tech stream does same job as $208
     
  3. rjparker

    rjparker Senior Member

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    You were in limp home mode because of one of several issues.

    Usually caused by a significant failure. I would go to your local hybrid shop. They will give you the best value options for the repair, which is where the real money is needed. In a 2010 there are many common hybrid problems, none of which get fixed with a diagnostic tool. For example, hybrid battery, brake booster system, electric water pumps or inverter failures.

    The one thing you can do first is take the 12v battery to an auto supply and have it load tested. If bad, replace it and then see if some of the computers work better.
     
  4. BrianTheLion

    BrianTheLion New Member

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    Any suggestions for something I can buy that does the same thing as tech stream?
     
  5. BrianTheLion

    BrianTheLion New Member

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    Thanks for the reply. I'm definitely expecting that I'll need to take it into the shop regardless to fix whatever failed in the car. Hoping to at least save a little money upfront by diagnosing the issue myself but I'm not sure if I'm brave enough to wade into the world of techstream and mini vci's...
     
  6. Grit

    Grit Senior Member

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    Your the second person to post this exact incident. The 1st person who did this, their inverter blew up and Toyota covered it under warranty. One of the best Prius scams on the forum!
     
  7. rjparker

    rjparker Senior Member

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    Kind of like saying the Brake Booster will go out if you slam on the brakes. I know my inverter failed after I parked at a restaurant. No hard acceleration, no lights until it would not Ready an hour later. The car was completely dead 90 miles from home on a Sunday evening. The Brake Booster failure at least had warning signals as the Pump ran excessively.
     
  8. royrose

    royrose Senior Member

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    If you want to get info without spending much money, get an OBDII adapter and run the Dr Prius app. It will give you most codes and tell you about hybrid battery health.

    If the 12v battery is original, it has lasted more than most, can can cause multiple warning lights to go on, should be replaced. Disconnecting and then reconnecting the 12v will probably take you out of limp mode but could clear the codes that you probably would like to know about.
     
  9. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Toyota did a software update recall, so that a sudden/hard acceleration demand is “buffered”. Post update you still get the acceleration but it happens slightly more gradually. This was to protect some soldered connections in the inverter.

    This happened in March 2014. My letter (from Toyota Canada) has the ID: SOSH-230-1A.

    For starters maybe check if yours had the update; dealership should be able to check when provided your VIN?
     
  10. vvillovv

    vvillovv Senior Member

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    I hope you've still got a good sense of humor about your prius?
    youtu.be/zI1gRqKysh4
     
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  11. BrianTheLion

    BrianTheLion New Member

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    Thanks for the advice everyone. I'll be taking the car into the shop this week and will update with the results. Hoping it's nothing or a blown inverter covered under warranty and that I can get back to drag racing soon.
     
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  12. vvillovv

    vvillovv Senior Member

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    If you haven't heard about Luscious Garage yet, you might want to take a peek.
    edit: Unless that is already your local garage.:cool:
     
  13. BrianTheLion

    BrianTheLion New Member

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    that’s where i’m taking her!
     
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  14. BrianTheLion

    BrianTheLion New Member

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    As suspected it was the inverter. After doing a diagnostic Luscious had me take the car to the dealership where they replaced the IPM inverter under warranty. Applicable codes were P0A94-557 DC/DC Converter Performance and P0A7A - Generator Inverter Performance.

    Glad I live in CA where the inverter warranty coverage is 15 years, not 10 like in some other states...
     
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