2015 not charging while coasting, ICE won’t turn off, odd acceleration

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Markdizle, Jan 7, 2020.

  1. Markdizle

    Markdizle Member

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    Second time this has happened. Car doesn’t seem like it’s charging when coasting, the ice always wants to stay on when stopped (well after she’s warmed up), battery fan in the back seat seems to be on more then usual, and the acceleration is really funky. Seems like it’s constantly trying to charge the battery with the ice on/ revved up higher, but won’t regenerate?

    Other than that the car runs great, excellent mpg. I changed the 12v battery 6 months ago, oil is fresh, no codes/ warning lights on the dash. Just north of 50k miles on the clock.

    Help!


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  2. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    If by 'coasting' you mean in N, that is correct, it does not charge in N.

    If the battery fan is on, the battery may be over heating. That would limit charging.

     
  3. Markdizle

    Markdizle Member

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    By coasting I mean decelerating in D, not N. Car sat for an hour+ while I was running, maybe the battery could have still been hot because I was going downhill for a few miles (1.5 miles tops) prior and topped off the battery?

    I did take her for a drive about 30 minutes later and all was well. Just want to catch a problem if there is one before it turns into a real issue!

    Thanks for the link, I did clean the fan about a year ago but doesn’t hurt to clean it again.


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  4. bisco

    bisco cookie crumbler

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    agree on cleaning the hybrid battery cooling fan again. have you owned the car since new?
     
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  5. Markdizle

    Markdizle Member

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    I’ve had it since 2017, absolutely zero problems except for this. Going to clean that bad boy today and report back, I couldn’t imagine it being dirty already but you never know


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  6. bisco

    bisco cookie crumbler

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    if you don't know the history, and fan cleaning doesn't help, you may have to dig into the battery and look for corrosion.
    do you carry shedding pets?
     
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  7. Markdizle

    Markdizle Member

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    No pets in the car while I’ve owned it


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  8. bisco

    bisco cookie crumbler

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    how many battery bars when it happens?

    it's not hot out, correct?
     
  9. Markdizle

    Markdizle Member

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    1 pip from full, after maybe a 2 mile drive somewhat down hill. It’s been rather cold out and car has sat for at least an hour before this happened, both times. You think it would have cooled off in an hour??


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  10. bisco

    bisco cookie crumbler

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    it shouldn't even be hot to begin with, in those conditions
     
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  11. fotomoto

    fotomoto Senior Member

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    No way the temperatures of the car, ambient or the battery are too hot in H. Beach in Jan. :confused:

    Most of these signs point to a weakened HV battery state. Assuming yours was purchased in Cali., you have many years left on the warranty but it's going to have to throw the appropriate codes first.

    You can get a cheap wireless OBD transmitter and a phone app to monitor it.
     
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  12. Markdizle

    Markdizle Member

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    Do you have one that you would recommend? I gave a Carista OBD thing, I ran the diagnostic tool and nothing came up.

    Happened again for the 3rd time, all 3 times I went to the same place to go running! I checked the fan mesh filter thing and it’s clean. Oil is topped off and smells like oil.

    I’ll probably take it in soon, I’ve never had to take a car in for service before (always been able to fix myself). Any recommendations near Aliso Viejo, CA? Dealer or small mechanic that is good with hybrids?

    Car drives PERFECT until I go to this one spot to run, so weird!!!


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  13. Grit

    Grit Senior Member

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    Some variation happens to my car at a certain stretch of my commute. Car would suddenly dip in instant mpg on the meter and rev up higher at the same stretch. When I looked at hybrid assistant app as I’m on the stretch, you can see the engine temp not yet at 190F so engine revs up. After temp is 190F, mpg meter goes up again. Same with SOC, once on the stretch, if temp is Already 190F but if SOC is below 60%, ICE revs up til SOC reaches 60%. Mystery was solved.
     
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