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2005 Prius - We got lights, and we got shapes boys

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Sam1994, Jan 18, 2019.

  1. Sam1994

    Sam1994 New Member

    Joined:
    Jan 18, 2019
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    Location:
    California
    Vehicle:
    2005 Prius
    Model:
    N/A
    Bought my Prius a few years ago. Ran great. Lots of wear and tear but all around solid.

    Maybe a year after owning I got my first triangle of death and the car died on me. It was in super hot weather, and I had been sitting in the car with it on for a little while. In retrospect I'm thinking it probably had something to do with the coolant pump, but I'm not sure.

    Had a mechanic come out and I think he basically just cleared the codes. It ran fine for a while after that but was dying every now and then.

    Fast forward another year and my Prius hasn't been starting a lot of the time. I have to get jumps regularly. I figure its the AUX battery and get a new one and all problems seem to go away.

    Fast forward again, another year, to now, and a couple of days ago I noticed that the battery in the trip info tab acting very strangely. It will start off very low or drain very quickly upon starting. It will go all the way down to the last bar. The car will also run like crap... very sluggish. However after running for a bit the battery charges all the way back up and runs fine. Interestingly though the battery literally goes from one bar all the way to full bars very, very quickly.

    And then finally today I got all the bells and whistle while driving to school. Triangle, check engine, amber exclamation mark, and VSC. There was also a weird vent thing that came on in the back seat. I've since learned that this is vent for the main battery. The car still runs (I had to get to and from school), but obviously there is something very wrong here.

    Now I just got the car serviced maybe two months ago, and I just got a new AUX battery less than a year ago, so I'm really thinking its an issue with the main battery which means doom for me as I can't afford that fix.

    Anyone got any ideas for me?

    All help much appreciated.
     
  2. Sam1994

    Sam1994 New Member

    Joined:
    Jan 18, 2019
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    Location:
    California
    Vehicle:
    2005 Prius
    Model:
    N/A
    Update: I checked the AUX battery charge with a multi meter and its at 12.4V so now I know that's not the issue.

    I also gave it a good ol hard reset by disconnecting the negative lead of the AUX battery and that cleared up all of the error lights. I'm guessing that just cleared the computer. Haven't driven it yet but when I turned it on it did the same thing as before and the trip info battery went all the way down to one bar. I let it run for a little while to charge it back up.

    Haven't driven on it yet but will update when I do if anything interesting happens.

    Obviously there is still an issue here. My guess is the main battery is just dying which is a hard sadface.
     
  3. JC91006

    JC91006 Senior Member

    Joined:
    Nov 10, 2013
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    Location:
    Los Angeles, CA
    Vehicle:
    2008 Prius
    Model:
    II
    Bad HV battery. It's lasted since 2005, not a bad run.

    Did you ever replace your inverter pump you mentioned? (Not that it'll fix your bad hv battery problem)
     
    Raytheeagle likes this.
  4. 2k1Toaster

    2k1Toaster Brand New Prius Batteries

    Joined:
    Feb 14, 2010
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    Location:
    Rocky Mountains
    Vehicle:
    2006 Prius
    Model:
    Three
    Yup, bad HV battery. You've sucked a lot of life out of that car.

    It may not be doom depending on what your budget is. After all a car you own is cheaper than getting any other car...
     
    Skibob likes this.
  5. Sam1994

    Sam1994 New Member

    Joined:
    Jan 18, 2019
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    Location:
    California
    Vehicle:
    2005 Prius
    Model:
    N/A
    Nope never replaced the inverter pump. What would be the cheapest option to get this fixed?
     
  6. JC91006

    JC91006 Senior Member

    Joined:
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    Location:
    Los Angeles, CA
    Vehicle:
    2008 Prius
    Model:
    II
    Your main problem seems to be the HV battery, until you get that resolved, you won't really know what other problems you have.
     
  7. stockdaddy

    stockdaddy Member

    Joined:
    Feb 27, 2015
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    Location:
    Missouri
    Vehicle:
    2006 Prius
    Model:
    II
    The going down to 1 bar shortly after the car is running is a classic sign of HV battery problem.

    The cheapest option to get this fixed is to do it yourself following a YouTube repair video.
     
  8. 2k1Toaster

    2k1Toaster Brand New Prius Batteries

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    Location:
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    Vehicle:
    2006 Prius
    Model:
    Three
    The only option is a new battery if planning on keeping the vehicle. There are not many sources to make that happen. If the goal is to fix it and sell it to some unsuspecting person or trade into a dealer, then a rebuilt will work fine for those dubious reasons.
     
  9. Skibob

    Skibob Senior Member

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    Location:
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    Vehicle:
    2006 Prius
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