Looking for others with 12V battery problems for class action lawsuit

Discussion in 'Gen 5 Prius Main Forum' started by Rick B., Jun 4, 2026 at 7:09 PM.

  1. Rick B.

    Rick B. New Member

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    Location:
    Los Angeles
    Vehicle:
    2025 Prius
    Model:
    Four
    I owned a Prius from 2015 to 2025, then purchased the new 2025 Prius in May 2025 and originally loved it. But in Feb 2026, I went on a 2-week vacation and returned home to a dead car, due to 12V battery with no juice. I had it jumped and didn't think there was a problem. But in April, I was on another 2 weeek trip, and returned home to same problem -- car was dead. Took it to Toyota dealer who replaced the 12V battery under warranty. But they insisted I had to get someone to start the car at least every 2 weeks. No one told me this. The sales person who sold me the car never said this. As a prior Prius owner, I never had to do this. I travel a lot and do not have easy access to people who can come start my car and spend 30 minutes with it while I am gone. There is an entry in the manual on page 420, but if this is a true warning, it needs to be on page 1. This is not the car I thought I was purchasing. Anyone else have this problem? I am thinking of a class action lawsuit against Toyota, as this is a radical departure from past Prius models that was not revealed when purchasing the car.
     
    Gokhan likes this.
  2. Gokhan

    Gokhan Senior Member

    Joined:
    Oct 5, 2008
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    Location:
    Paramount CA
    Vehicle:
    2021 Prius Prime
    Model:
    Limited
    This has been posted here many times.

    The problem occurs when the car sits at the dealer lot for too long before it is sold, or when it is not driven frequently. Once the 12-V battery SOC drops too low, the 12-V BMS will no longer fully charge the battery.

    The solution is simple. Get a Noco Genius battery maintainer and hook it up when you first buy the car, then again every few months. This will ensure the battery stays fully charged.