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Reset ECU after replacing hv

Discussion in 'Gen 2 Prius Main Forum' started by Ernie stires, Jun 22, 2023.

  1. Ernie stires

    Ernie stires Member

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    Should I reset the ECU after installing a rebuilt HV battery?
     
    #1 Ernie stires, Jun 22, 2023
  2. highmilesgarage

    highmilesgarage Active Member

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    no such thing, if you're refer to clearing the codes present then yes but you don't have to since it will clear itself (if no issues). Disconnecting the battery alone clears the ECM (engine side only) codes.
     
    #2 highmilesgarage, Jun 22, 2023
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  3. Ernie stires

    Ernie stires Member

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    Thanks. Would it be normal for the ICE to run more initially? I haven’t driven it except around the block and dr prius reports all pretty much good
     
    #3 Ernie stires, Jun 22, 2023
  4. rjparker

    rjparker Tu Humilde Sirviente

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    It might if the hv battery charge is depleted. Normally it would not run for more than a minute to add a little charge. If it does not normalize quickly after one ten minute drive (eg no engine at stop lights w ac on) then I would question the quality of the used battery.
     
    #4 rjparker, Jun 22, 2023
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  5. Ernie stires

    Ernie stires Member

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    just did a 45 minute test drive and you are correct. The ICE settled down. Thanks! I don’t expect this battery to last more than a year, although I have a 3 year guarantee and I’m going to start sourcing a new Toyota battery.
     
    #5 Ernie stires, Jun 22, 2023
  6. bisco

    bisco cookie crumbler

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    which company did you go with?
     
    #6 bisco, Jun 22, 2023
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  7. PriusCamper

    PriusCamper Senior Member

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    Yep... It's not certain of charge level yet and is trying to get more data.
     
    #7 PriusCamper, Jun 22, 2023
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  8. Ernie stires

    Ernie stires Member

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    I live in Denver and used Aplushybrid. Frankly I was stuck, the old battery chapped out-4 year old rebuild- and I needed mobile install.
     
    #8 Ernie stires, Jun 22, 2023
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