‘03 P3001Code after new battery ECU

Discussion in 'Generation 1 Prius Discussion' started by Ethan Gueck, Oct 23, 2024.

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  1. Ethan Gueck

    Ethan Gueck New Member

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    Got the triangle of death, check engine light, and the hybrid light come on. Plugged in my tech stream and I’m seeing P3000 and P3001 for Battery ECU.
    I’ve attached pics of the codes and the freeze frame for each.

    This happened a few months ago, so I replaced the battery ECU and I thought that fixed it. I will say, both times that this happened I drove the car for about 5 mins, at low speeds twice a day for 3-4 days and then this happened. (I was traveling for work and the hotel is very close to where I was working.)

    Maybe I’m draining the hybrid battery and not driving enough for it to recharge? What do yall think? Is there anything I need to do? Or should I just delete the codes and move on?
     

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    #1 Ethan Gueck, Oct 23, 2024
  2. Victor Siles

    Victor Siles Junior Member

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    Checked Google this is what it said: The P3001 code in a Toyota Prius indicates that cylinder number one is misfiring due to an inadequate amount of fuel in the air/fuel mixture. This causes the cylinder to not move at the correct rate.
     
    #2 Victor Siles, Oct 24, 2024
  3. Ethan Gueck

    Ethan Gueck New Member

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    Isn’t that P0301?
     
    #3 Ethan Gueck, Oct 24, 2024
  4. ChapmanF

    ChapmanF Senior Member

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    That would be correct for the code P0301—that is, the SAE-standard P0 code that applies to any car with an engine and means a misfire in cylinder one.

    Your code is P3001—a code in the "jointly defined" P3 range, and in a gen 1 Prius, Toyota uses it to mean a malfunction in the hybrid battery ECU.

    [​IMG]

    When you say "checked Google", do you mean you did a Google search, or that you relied on some newfangled generative AI to make up an answer for you?

    In a straight search, I am not used to seeing Google bring up hits with the digits swapped around like that. (Hmm, I just tried a search for "P3001 Prius" and the top of the results page was all about P3001, but there were a couple P0301 hits further down the page.)

    The passage you quoted looks almost like the kinds of answers people are getting from generative AI bots these days—full sentences that sound like trying to explain something to a kid, all while it's about the flat-out wrong code. :rolleyes:
     
    #4 ChapmanF, Oct 24, 2024
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