4th gen Engine swap

Discussion in 'Gen 3 Prius Technical Discussion' started by Ata, Nov 18, 2025 at 1:24 PM.

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  1. Ata

    Ata New Member

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    Location:
    St louis
    Vehicle:
    2015 Prius
    Model:
    Four
    Swapped the engine with a 4th gen engine
    Now it says hybrid malfunctioning and throws
    Poa40 and poa41 error
    Anybody has any idea whats up with it?
     

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    #1 Ata, Nov 18, 2025 at 1:24 PM
  2. Tombukt2

    Tombukt2 Senior Member

    Joined:
    Nov 29, 2020
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    Location:
    Durham NC
    Vehicle:
    2009 Prius
    Model:
    Base
    Looks like the Gear wrench software. . I got a bunch of this changing from federal to JDM gen3 swap . The JDM throttle body didn't seem to be happy and a miserably failing HV battery. Once dealt with . All worked for a short while . Everything's plugged up safety plug in and all that ,?
     
    #2 Tombukt2, Nov 19, 2025 at 6:56 AM
  3. ASRDogman

    ASRDogman Senior Member

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    May 29, 2018
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    Location:
    Florida
    Vehicle:
    2010 Prius
    Model:
    Two
    Everyone has issues when the put the different engine in. If you search prius chat you can find many
    threads about the issues and how to possibly get a fix for them.
     
    #3 ASRDogman, Nov 19, 2025 at 8:07 AM
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