prius died on Highway. All warning lights came on. Hv battery discharges fast

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by drewbabich, Jul 23, 2014.

  1. drewbabich

    drewbabich Junior Member

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    199k on my prius. I'm driving 65 mph and bam! All warning lights come on, PROBLEM, comes up on the mfd, and the mfd had a funky little broken cat symbol light in the top left corner.

    I lose engine power and coast to a stop. As I'm coasting the speed display stops showing my speed... even though the rest of the gouges are lit on the display. While parked I realize I have very little 12v battery juice....

    With a jumper pack on the front terminals I get the cat home. I ser on the display the my hv battery is stuck at one bar.

    At home I charge the 12v battery and get the hv battery fully charged by holding the gas down in drive with foot on the brake. My Toyota mechanic told me to do that. All warning lights go away. I leave a jumper pack on the battery in the rear and take for another test drive. Car is better but still sluggish... Try to get it up to 50 mph and bam! again all warning lights return.

    So I get the car to toyota dealer and and my guy reads the codes and tells me every ecu is showing codes abs recommends 12v battery replacement. He clears the codes. So I buy a brand new battery and after installing it all warning lights return on test ride. Car won't do over 50 mph and is def still a mess.....

    So conclusion, I replaced the battery but hv battery still Decharges very fast and car has Lack of power. Lots of warning lights. Anyone have any info on this? Car is going back to Toyota tmrw.
     
    #1 drewbabich, Jul 23, 2014
  2. john1701a

    john1701a Prius Guru

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    Finding out what the codes are is a good first step to figuring out what the scope of the problem is.
     
    #2 john1701a, Jul 23, 2014
  3. Patrick Wong

    Patrick Wong DIY Enthusiast

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    1. When the Prius is READY, look for fluid turbulence in the inverter coolant reservoir. If you don't see this, the inverter coolant pump failed and that is the cause of your car's problems.

    2. If the pump is OK, use Mini VCI to retrieve the DTC.

    3. Take good photos of the warning lights and MFD warning icon and post.
     
    #3 Patrick Wong, Jul 23, 2014
  4. drewbabich

    drewbabich Junior Member

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    Mfd
     

    Attached Files:

    #4 drewbabich, Jul 23, 2014
  5. drewbabich

    drewbabich Junior Member

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    Speedo and mfd pic.

    Mini vci? Is that a scan tool?

    I will check the inverter when I get home.
    If the cooling pump was shot wouldn't the car completely fail to recharge the hv battery? It still does charge, it just can't keep up with the demand ... and the car has Lack of power and won't do over 55 mph
     

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    #5 drewbabich, Jul 23, 2014
  6. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Mini VCI:
     
    #6 Patrick Wong, Jul 23, 2014
  7. wjtracy

    wjtracy Senior Member

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    ...long shot but sometimes the new 12v is not charged up well so that's another thing
     
    #7 wjtracy, Jul 24, 2014
  8. tawaka7

    tawaka7 Junior Member

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    #8 tawaka7, Aug 29, 2015
  9. tawaka7

    tawaka7 Junior Member

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    Hi did you find what the problem was mind doing the same thing.
     
    #9 tawaka7, Aug 29, 2015
  10. bisco

    bisco cookie crumbler

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    12volt? or hybrid battery.
     
    #10 bisco, Aug 29, 2015
  11. JC91006

    JC91006 Senior Member

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    Sounds like a hybrid battery failure, not sure why Toyota didn't pick that up
     
    #11 JC91006, Aug 29, 2015
  12. bisco

    bisco cookie crumbler

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    shocking really.
     
    #12 bisco, Aug 29, 2015
  13. JimN

    JimN Let the games begin!

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    First guess, traction battery.
    Second guess, inverter coolant pump.
    Third guess, 12v battery could be weak as we don't know the age, but it can't be the source of the problem as the car doesn't need it to run.

    Start looking for a used traction battery in salvage yards or shop around for a new one.

    Always get a list of the diagnostic trouble codes retrieved.
     
    #13 JimN, Aug 30, 2015
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