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mpg change after battery replaced

Discussion in 'Gen 2 Prius Fuel Economy' started by mailman714, Jul 27, 2015.

  1. mailman714

    mailman714 New Member

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    I have a 2005 Prius recently replaced the hybrid battery. Not so happy with it, my mpg b4 was 49-51 mpg, now I only get 40-45 mpg. Anybody know y? I notice the car is a little weaker and the ICE rev higher everytime I accelerate.
     
    #1 mailman714, Jul 27, 2015
  2. uart

    uart Senior Member

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    New battery or reconditioned? Who replaced the battery and what was the cost?
     
    #2 uart, Jul 27, 2015
  3. bisco

    bisco cookie crumbler

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    probably botched the rebuilding job. if each cell isn't in complete harmony with the earth's rotation? you're undone.
     
    #3 bisco, Jul 27, 2015
  4. gdanner

    gdanner Member

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    My recommendation is to go back to the place that installed your HV battery and get them to double check everything. I suspect there is a fault within your new HV battery.


    I have a 2005 Prius with 83k miles. 4 weeks ago I began getting DTC codes (P0A80). I could reset the code with my Scangauge, but the DTC code would come back the next time I drove the car. Performance decreased greatly after the code came up. The ICE would run all the time and the car would only go about 40 mph max. mpg was awful, only about 30 mpg.

    After doing some diagnosis, I replaced 2 modules inside my hybrid battery myself, following instructions posted here:

    Gen II Prius Individual Battery Module Replacement | PriusChat


    My mpg immediately went from 30 to >40 after I fixed my hybrid battery. I haven't had any more DTC codes,and the car is running great.


    -EB
     
    #4 gdanner, Jul 27, 2015
  5. JC91006

    JC91006 Senior Member

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    #5 JC91006, Jul 27, 2015
    uart likes this.
  6. uart

    uart Senior Member

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    Thanks JC. That explains a lot more.
     
    #6 uart, Jul 28, 2015
    Last edited: Jul 28, 2015
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