Please help me. u0100 lost communication with ECM PCM? it blinks and ignites the triangle

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by lasha, Oct 24, 2019.

  1. lasha

    lasha New Member

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    Please help me. u0100 lost communication with ECM PCM? it blinks and ignites the triangle
     
  2. SFO

    SFO Senior Member

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    Welcome to PriusChat!!

    You could be missing some additional DTCs, which OBD2 scanning device are you using to retrieve the above DTC ?

    If might be time to upgrade your arsenal to include a mini-vci cable and techstream.
     
  3. ericbecky

    ericbecky Hybrid Battery Hero

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    Check the health of your 12v battery.
     
  4. Q*bertZ

    Q*bertZ Junior Member

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    I had corrosion on my pins coming out of the back of my Gen1 HV battery. I cleaned off the corrosion and the "lost communication error" went away.
     
    #4 Q*bertZ, Oct 26, 2019
    Last edited: Oct 26, 2019
    SFO likes this.
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