Prius Won't Start Despite New 12V Battery

Discussion in 'Prius v Care, Maintenance and Troubleshooting' started by Viridis, Sep 25, 2020.

  1. Viridis

    Viridis New Member

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    I bought my Prius about a year ago, October 2019. It had 97,000 miles, currently has about 102,000. I'm work from home now, so it has mostly been sitting since March, however I was driving it about once a week for groceries/errands. Everything was fine, and then about 2-3 weeks ago it wouldn't start. The power came on, but not the READY signal. I called for a jump, got it jumped, everything was fine. Last week, it died again, and this time there was no power at all, I couldn't even use the key fob to open the doors. The guy who came to jump it said the 12V battery was nearly completely dead and recommended a replacement.

    So, I took it to the mechanic Saturday after another jump. They replaced the 12V battery. I picked it up Monday, drove it for errands Tuesday. On Thursday, it was totally dead again-- had to use the manual key to get in.

    Today, I pulled out my power pack and tried to jump it. Despite leaving the jump pack on 5 minutes (as the starter manual recommends), I couldn't get the car to start at all. I did check to see if I'd left lights on, but the headlight switch is in the OFF position.

    A mechanic friend of mine suggested checking/wiggling the battery connections to see if something is loose, but I'm not sure how to do that.

    I am totally baffled how a brand-new battery could die in 2 days. Any ideas on what is happening here? I hate to call roadside assistance out to jump the car again.
     
  2. rjparker

    rjparker Senior Member

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    Connections could be a problem. Also check the negative cable's connection on the chassis. Verifying voltage with a meter at the front jump pump is also important. Sounds like a high current draw on the 12v even when shutdown. Could be the hatch light. Have to get the battery charged up and try once again. A good mechanic can find the current draw with a dc clamp meter while pulling fuses one for one.
     
    #2 rjparker, Sep 25, 2020
    Last edited: Sep 25, 2020
  3. Air_Boss

    Air_Boss Senior Member

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    I hate to put it this way, but are you sure they really replaced your 12V auxiliary battery with new?
     
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  4. Viridis

    Viridis New Member

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    They certainly charged me enough for it. >_> This mechanic has done reliable work in the past, but I haven't worked with them on a hybrid before. I will definitely be taking the car back to them to see if they screwed something up.
     
  5. Viridis

    Viridis New Member

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    Alright, i will call someone to jump the car again and take it back to the mechanic-- I dont' really have the equipment to measure voltage or look at fuses or anything.
     
  6. Viridis

    Viridis New Member

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    If anyone knows a recommended hybrid mechanic in Indianapolis, IN, I'd appreciate it. I went to my usual mechanic, but I've only worked with them on my old Corolla, I don't know how experienced they are with hybrids.
     
  7. bisco

    bisco cookie crumbler

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    could be something is draining it while off
     
  8. Viridis

    Viridis New Member

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    That seems to be a likely culprit. I will have the mechanics check to see what they can find.
     
  9. Mendel Leisk

    Mendel Leisk Senior Member

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    No, you're kidding yourself.
     
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  10. Tim Jones

    Tim Jones Active Member

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    .......... have you had the inverter firmware updates? Check oil regularly...and keep a eye on the coolant level....Hybrids are great till things start going wrong... and if you can't do the repairs yourself...... it's very $$$$$
     
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