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Battery overheated whilst parked in basement

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by namuramc, Feb 25, 2023.

  1. namuramc

    namuramc New Member

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    Hi everyone, I just had a weird event on my ride. I drove to a mall for a movie and parked in the underground parking. It wasn't too hot..maybe around 28 degrees C outdoor and parking lot was around 32 degrees C. SOC of the battery was 6 out of 8 bars when I turned it.

    After 4 hours came back for the car and as I moved out of the car park...the ICE turned on and remained on for the longest time. I lost regen braking and when at a stop the engine remained on. The battery fan was super loud and my guess is that the battery was really hot.

    Question is has anyone encountered this situation before? I wasn't driving the car too hard heading to the mall and was just a short 15 minute drive.

    It sounds to me something must have caused the battery temp to spike up. The only thing I recalled doing before the ICE turned on was tapping a bit harder on the accelerator while in the car park..for a brief second.

    Would love to get some advice from anyone who's seen this before.

    Thanks everyone :D
     
    #1 namuramc, Feb 25, 2023
  2. bisco

    bisco cookie crumbler

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    how many km on her?

    is the battery intake filter grille clean?
     
    #2 bisco, Feb 25, 2023
  3. namuramc

    namuramc New Member

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    She's only done 22K KM and the battery intake filter is clean. The battery temperature was around 45 degrees C when I finally got a chance to plug in my OBD2 dongle. The engine turned on when there was still 6 out of 8 bars in the battery display and was on a flat road in the car park.

    Today it's back to normal and no fault codes found. Took it for a long drive and the issue does not re-occur.
     
    #3 namuramc, Feb 25, 2023
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  4. Mendel Leisk

    Mendel Leisk Senior Member

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    Was this the state of charge when you turned it off, prior to the movie? If so, did you notice any change when you came back?

    I’ve noticed on hot days after a lot of driving, engine will sometimes keep running when stopped, even with battery state of charge display looking good. This is on a 3rd gen though.
     
    #4 Mendel Leisk, Feb 26, 2023
  5. rjparker

    rjparker Tu Humilde Sirviente

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    Sounds like an early hv battery failure on a 2022. Should be warranty.
     
    #5 rjparker, Feb 26, 2023
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  6. namuramc

    namuramc New Member

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    The battery was with 6 out of 8 bars when I left the car for the movie and when I got back.

    The car park was shaded underground. Guessing no more than 32 degrees C
     
    #6 namuramc, Feb 26, 2023
    Mendel Leisk likes this.
  7. Mendel Leisk

    Mendel Leisk Senior Member

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    Try Dr Prius (Carista Bluetooth OBD adapter works well with it) to get some idea of hybrid battery condition.

    again, I’ve seen similar behaviour on hot days, after a lot of driving.

    Parking it hot in a hot enclosure can’t be good though. About a year back we replaced our solid wood garage doors with with steel sheathed insulated doors, at least in part for this reason: it would get very hot in the garage on summer afternoons, and bringing in a hot car didn’t help.
     
    #7 Mendel Leisk, Feb 26, 2023
  8. bisco

    bisco cookie crumbler

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    32c shouldn’t cause any problems, maybe just an anomaly
     
    #8 bisco, Feb 26, 2023
  9. namuramc

    namuramc New Member

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    One other thing was when I touched the area under the rear seats where the battery is,it was really warm . Warmer than normal. So guessing the battery was indeed quite hot.

    Normally can barely feel a thing in that area.
     
    #9 namuramc, Feb 26, 2023
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  10. CooCooCaChoo

    CooCooCaChoo Active Member

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    Yeah, I live in California and our summers for the past 6 years have been brutal. 110-115 Fahrenheit (43-46 Celsius) in full sun. Never had a single problem with the battery system. I think what helped me is my Prius is white, my windows are tinted, I leave the windows down an inch to ventilate and I use a sun visor to protect the dash.
     
    #10 CooCooCaChoo, Feb 26, 2023
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  11. Doug McC

    Doug McC Active Member

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    I keep wondering, how many of us actually read the Owner’s Manual?
     
    #11 Doug McC, Mar 9, 2023
  12. Elektroingenieur

    Elektroingenieur Senior Member

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    How about the Owner’s Manual, Quick Reference Guide, Information Guide, Navigation System Owner’s Manual, Entune System Quick Reference Guide, Warranty and Maintenance Guide, New Car Features, Repair Manual, Collision Repair Manual, Electrical Wiring Diagram, Emergency Response Guide, Hybrid Vehicle Dismantling Manual, Toyota Warranty Policy and Procedures Manual, and Electronic Parts Catalog, plus all the bulletins and miscellaneous documents, and most of those again for the European and Japanese models?
     
    #12 Elektroingenieur, Mar 10, 2023
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