2009 Prius sitting for 7 months, no start

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Basia, Oct 5, 2021.

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  1. Basia

    Basia New Member

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    Hi everyone,
    I've been traveling for half the year and returned home to find my 2009 Prius isn't starting. I disconnected the 12V battery and reconnected. No luck. My key fob shows a red blinking light when I press the button, so I don't believe the fob is dead. However I cannot unlock the doors or start the car with the fob.

    I have no dash lights or power button function. Any advice?
     
    #1 Basia, Oct 5, 2021
  2. JC91006

    JC91006 Senior Member

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    change the dead 12v battery.

    What part of CA are you at? Maybe if you can charge the HV battery before starting the car, it'll help it from getting out of balance and die.
     
    #2 JC91006, Oct 6, 2021
  3. mr_guy_mann

    mr_guy_mann Senior Member

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    Check the voltage level of the 12V battery with a digital multimeter- have it charged, load tested, (or replace it). Then hope that your high voltage hybrid battery hasn't self discharged from just sitting there.

    Posted via the PriusChat mobile app.
     
    #3 mr_guy_mann, Oct 6, 2021
  4. Mendel Leisk

    Mendel Leisk MMX GEN III

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    7 months'll do it. Heck, one month will do it. 12 volt batteries sitting in storage will slow-but-sure discharge. 12 volt batteries installed in a car have it much tougher: there's constant low-level demand on it. If you don't disconnect it (just the neg battery cable will do) or connect a suitable charger, it runs down. Time for a new one.
     
    #4 Mendel Leisk, Oct 6, 2021
    Last edited: Oct 6, 2021
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