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Hybrid System disconnects after awhile

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by david10tco, Aug 26, 2017.

  1. david10tco

    david10tco New Member

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    I have a 2007 toyota prius on about 173k miles. While driving around the dashboard suddenly lighted up with the red triangle, vsc, check engine, and a light that looks something like ((!)).

    My OBD Scanner shows 2 error codes, U0100, lost communication with ECM/PCM A; and U0111, lost communication with battery energy control module A.

    I can start the car, and drive around with the battery and engine for a few minutes, before the car will lose the battery and rely solely on gas. But everytime I restart the car I can use the battery for a few more minutes. Note that when I lose the battery the battery is still holding a charge but it's just that the car no longer depletes/charges the battery while driving

    Is this something I may be able to diagnose myself? Thank you for your help
     
    #1 david10tco, Aug 26, 2017
    Last edited: Aug 26, 2017
  2. Sam Spade

    Sam Spade Senior Member

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    Check or have someone else check the 12 V battery before you do anything else.

    IF.....it is the original OEM one (10 years old) then don't even bother checking it; just get a new one......and charge it up good before installing.
     
    #2 Sam Spade, Aug 26, 2017
  3. bisco

    bisco cookie crumbler

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    maybe need a new hybrid battery.

    1) check your inverter reservoir for fluid movement with the car in ready. if there is no movement, replace the pump.

    2) if there is movement, get a mini vci and read the codes properly.
     
    #3 bisco, Aug 26, 2017
    Beachbummm likes this.
  4. David1235850

    David1235850 New Member

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    ----USA----
    I have the same problem I changed the 12v battery and the hybrid battery as well and the same 2 codes keep coming up "u0100, u0111' and giving me the the check engine light as well as the red triangle what do I do ?
     
    #4 David1235850, Feb 1, 2021
  5. Figster10

    Figster10 Member

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    Did you figure things out after replacing hybrid battery and 12v battery?

    Posted via the PriusChat mobile app.
     
    #5 Figster10, Jun 8, 2021
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