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Cruise control drains EV battery

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by mskojon, Sep 15, 2020.

  1. mskojon

    mskojon Junior Member

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    Hi folks!
    I used cruise control for first time driving on highway few days ago and I noticed a problem.
    15-20min of cruising faster than 70mph drains battery to zero, gasoline engine is reving high and screaming, and car lose performance. Is it a normal thing? I know that driving fast requires a plenty of power but I think it should not happen.
    What do you think?
     
    #1 mskojon, Sep 15, 2020
  2. JC91006

    JC91006 Senior Member

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    This happens if your car has high mileage and the gasoline engine is not providing much power. Also happens if you're going really fast and uphill
     
    #2 JC91006, Sep 15, 2020
  3. sam spade 2

    sam spade 2 Senior Member

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    Also might indicate that the HV battery is starting to fail.

    IF.....the only "symptom" was the HV battery staying at a low level of charge, then that might be normal while the car's systems are straining to maintain a high speed.
     
    #3 sam spade 2, Sep 16, 2020
  4. dolj

    dolj Senior Member

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    The paradox is that one could follow the other in an older Prius. As the engine misbehaves and puts more demand on the HV battery, it could be enough to tip the HV battery over the edge.
     
    #4 dolj, Sep 16, 2020
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