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2012 Prius Intermittent Hybrid Battery Warning

Discussion in 'Gen 3 Prius Technical Discussion' started by Ms.B, Jul 1, 2024 at 7:20 PM.

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  1. Ms.B

    Ms.B New Member

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    Hello everyone,

    I have a 2012 Prius that has had the hybrid battery warning light come across the dash many times in the last 2 years of ownership. I took it to Toyota and they said they couldn’t find ANYTHING wrong with the car. Causing me to unhook the battery EVERY time this light comes on to reset due to no known issue causing this.

    I have had codes read and not noticed anything in particular related to the battery. When the engine turns off from being in hybrid mode it rattles pretty bad. Even after having them engine replaced over a year ago.

    Any suggestions? I’m not sure if it’s the MAP sensor etc, but this car is my daily driver and I really want to fix this problem as it is not safe, when driving on the freeway and the light comes on randomly causing the gas to become slow to respond.
     
    #1 Ms.B, Jul 1, 2024 at 7:20 PM
  2. bisco

    bisco cookie crumbler

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    welcome!
    how many miles on your car?
    is the battery original?
    what codes did the dealership pull?
    who installed the engine?
    was it new or used?
     
    #2 bisco, Jul 1, 2024 at 9:37 PM
  3. ASRDogman

    ASRDogman Senior Member

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    Just because it says the hybrid battery is bad, it doesn't mean it is.
    It's the whole hybrid system. Which includes many things.
    You need a good code reader that will read ALL the codes for the hybrid system
    and it's likely you'll get codes so you know where to look.

     
    #3 ASRDogman, Jul 2, 2024 at 9:16 AM
    Danno5060 likes this.
  4. Eddie25

    Eddie25 Active Member

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    Yep, as mentioned the light is just telling you something is wrong, which no one can just guess on. Get the code and it'll send you in the right direction.

    I would suggest a cheap OBD2 bluetooth dongle from amazon that works with your phone OS. There are a few free apps that will read codes, (Torque for android and Car Scanner for ios) then you can just leave the dongle plugged in so the next time it happens you just run a code scan and get the codes right there.
     
    #4 Eddie25, Jul 2, 2024 at 10:50 AM
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