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Help!!! Codes P08A3 and P0A37 Prius 2005

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by CesarSaez, Aug 6, 2015.

  1. CesarSaez

    CesarSaez New Member

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    Hello,
    I have a 2005 Prius that financed from a small dealer last year.
    Currently has over 140k miles on it
    When I bought it it had the Red Triangle and it worked fine until recently (about 2 months ago).
    Recently I've been having some problems. When I go at higher speeds I get the following sings come on:

    1. Red Triangle
    3. Orange check engine light
    2. Orange (Symbol)CHECK - Malfunction Indicator Lamp
    3. Orange (!) - Brake Warning Light
    4. Orange VSC - Vehicle Stability Control Warning Light

    When these lights are on, my AC stops blowing cold air.
    Sometimes when all these lights are on, the car will slow down and will not let me go past 37 MPH I have to then pull over turn the car off and then on, then the lights turn off and I can drive normal, on short trips that is.
    Recently on a longer trip over 50 miles or so all the lights I mentioned came on plus the red break light on the left turned on with a continuous beep.
    We pulled off the HWY and turned the car off then on and the lights disappeared except for the big red Triangle that one is always on. We continued driving it but it kept doing it so we had to let it rest for over 30 minutes. We had to take it really slow and we finally got to our destination which was my best friends wedding and we missed the ceremony :(.

    I just took the car to a mechanic and gave me the following codes:
    P08A3 Inverter cooling System Performance
    P0A37 Generator Temperature Sensor

    I checked with the dealer and all of the recalls have been done on the car including the inverter pump.

    I've been reading a lot of forums and it seems like it could have something to do with the Inverter Pump
    but it has been replaced with the recall. The cooling fluid is topped and it's not leaking.

    I will greatly appreciate any help or input on any DIY or inexpensive solutions. We don't have a lot of money and we are still making payments on this car.

    PS: Thanks in advance for taking the time to read this extremely long message!
     
  2. bisco

    bisco cookie crumbler

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    welcome! open the inverter tank just to make sure it's swirling.

    turn the car on, then check.
     
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  3. CesarSaez

    CesarSaez New Member

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    Thank you very much for reading and responding.
    I opened the tank just now the car is parked the engine is cold and the liquid in there was still. Im not sure how to check for swirling.
    Thanks again!

    I checked and the fluid was not swirling it was still. Do I have to wait a certain time to check for the swirling or does it happen as soon as the car is on?
    Thanks!
     
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  4. JC91006

    JC91006 Senior Member

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    you bought this with the red triangle and you continued driving it with the red triangle?

    You gotta be kidding me.

    At this point, you would need to find out what's wrong with the car. You need a proper code reader to diagnose this yourself or you can bring it to the dealer at $120 per hour. Autozone might be able to do it, but I'm not sure if they allow it in CA. A code reader will pinpoint the problems to your car and you can address them one by one.
     
  5. CesarSaez

    CesarSaez New Member

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    Yes I did :( Unfortunately the people at the dealer told me that nothing was wrong with the car and I believed them. It's my first Prius and I didn't know any better.

    I took it this morning these are the codes:
    P08A3 Inverter cooling System Performance
    P0A37 Generator Temperature Sensor
     
  6. Paradox

    Paradox Prius Enthusiast / Moderator
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    Moved. You posted in the Prius v forums yet own a Gen II.
     
  7. JC91006

    JC91006 Senior Member

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    so what did your mechanic say about repairing these 2 items? Where you got the codes from

    An inverter cooling pump can definitely fail again, even after it's been replaced in 2011. As recommended by Bisco, try to get the car in READY mode. Open the cap to the inverter coolant, look in and see if the coolant swirls. If there's movement in the coolant, that means the pump is working. If there's no sign of movement, then your pump has failed.
     
  8. CesarSaez

    CesarSaez New Member

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    My apologies I wasn't sure which was the right forum. Thanks for moving it to the proper one.

    He plugged it into a hand held computer and those are the codes he got. He wrote them down and gave me a list of recalls for the car. I then called the dealer and told me the recalls have been serviced.

    I think it does have something to do with the Inverter Cooling system. But the pump has already been replaced through the recall. It was done in 2011 according to the dealer. Could it be possible that it needs to be replaced again?
    That is why Im trying to get on opinion on this forum. It seems to be really helpful

    I think that is the problem then, I got the car on READY mode and did not see any movement. Do you recommend waiting a certain amount of time to check for moment or should it happen as soon as the car is on READY mode.

    Im going to try it again just to make sure.

    Thank you very much for all you insight!
     
  9. JC91006

    JC91006 Senior Member

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    the minute the car is READY, the pump should be moving.

    If you are handy and have some tools, you can replace this pump yourself. There are tutorials on this site that addresses this problem.

    If you bring it to a dealer, it may cost you over $500 for the repair.
     
  10. CesarSaez

    CesarSaez New Member

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    Yes Im pretty handy I've seen a tutorial on how to replace the pump already and does not seem too hard with the right tools.
    I will probably change it my self.

    Thanks for the help I'll let you know how it goes!

    Cheers!
     
  11. JTM2955

    JTM2955 Active Member

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    I didn't think a dealer could legally sell a vehicle with a check engine let alone the Master Warning Lamp shining.
    Could be that the inverter system has air trapped causing the lamp to turn on, then the AC shuts off and slows the vehicle to a max 35 and finally it beeps at you.
    If you did not know, there are two cooling systems. One for the inverter and the other for the engine.
    Does your car have an coolant leaks???. Did someone try to change the coolant and not bleed out the air?
    It sounds to me that the Prius is protecting itself. I hope you haven't cooked the inverter. Those are really expensive. But, there are used available, too.
     
  12. CesarSaez

    CesarSaez New Member

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    Hello and thanks for the reply,
    The car has no leaks at all.
    I have done what previous people on this thread said which was get the car on READY mode and then check to see if there was swirling in the coolant fluid and there isn't any. Which lead me to conclude that the Inverter Pump has failed and needs to be replaced.
     
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  13. JTM2955

    JTM2955 Active Member

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    Does the reservoir have coolant? I, too, have had my inverter pump die. We were returning from Florida going home to Indiana. The red triangle appeared and I drove straight to the dealership. First dealer said I could drive it home to Indiana. Well I started to but couldn't do without A/C.
    Went to the dealer in St Augustine and they got me a rent a car. They even helped me transfer my suitcases to the rental. A week later the car was fixed. It seems there were zero inverter pumps in Florida and they were on Nat'l backorder. This was August of 2008.
    My Prius has been fine ever since. Toyota paid the rental bill and trip interruption fee. Would I buy another Toyota? I did, my daughters have and even my sister-in-law. They turned a negative into a positive.

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  14. CesarSaez

    CesarSaez New Member

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    Yes the Reservoir is topped with coolant. Im sure it's the pump hopefully my car will be fine after this. I really do love my Prius it's a great car and don't think I can go back to a regular car after this.
     
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  15. JTM2955

    JTM2955 Active Member

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    If you haven't driven a Camry Hybrid by all means drive one. Its like a Prius on steroids. Imagine your Prius with more horsepower, more torque and even quieter.


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  16. bisco

    bisco cookie crumbler

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    is there a fuse for the pump, or a need to make sure it's getting power?
     
  17. CesarSaez

    CesarSaez New Member

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    Hello,

    Just wanted to update everyone on my situation I replaced the inverter pump and it seems to be working. The problem now
    Is that as soon as a changed it the brake light, ABS, VSC, (!) and red triangle lights will not go away.

    Does anyone know how they go away?
    The mechanic plugged it in the computer and it still gives us the inverter pump error but
    We just changed it with a brand new Toyota inverter pump.

    Any thoughts?

    Thanks!
     
  18. bisco

    bisco cookie crumbler

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    there have been a few bad replacement...
     
  19. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Was the air purged out of the inverter coolant loop?
    Do you see fluid turbulence in the inverter coolant reservoir?
     
  20. JTM2955

    JTM2955 Active Member

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    If it was changed, something that big may have caused the computer to"latch up". Have you, by chance, powered down the entire system by pulling the safety plug and see if it would go away. This isn't the first time I have heard of this.
    Toyota may have done this so that you have to use the factory scanner. Hope you get it fixed!

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