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Continuous Faint Humming Noise When Parked

Discussion in 'Model S' started by Droschke, May 16, 2019.

  1. xceler8tion

    xceler8tion Member

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    I average about 325 Wh/mi. Must be the heavy 21" wheels.
     
  2. Droschke

    Droschke Member

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    Correct, also more spirited driving in your case ;)
     
  3. pairtrader

    pairtrader Member

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    As predicted, mine made the noise once, then again for a shorter period. Nothing since. I wasn't able to check the impact on range. I'm just glad there's nothing wrong with the car. I'm 15 months past my last service (4 year service) and I'm hoping to avoid service/repairs for some time.

    I may not have even noticed the noise if I parked outside, so maybe that's what Tesla was hoping for.
     
  4. Droschke

    Droschke Member

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    That's what I also have suspected. They won't just run this maintenance on few cars.

    My Rated Miles is getting worse. Yesterday, at 50% the car was showing 121 RM vs. about 130-132 I was getting in the past. I'm planning to charge to 100% to see what the RM would be.
     
  5. First EV

    First EV Member

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    Mine is doing the exact same thing. 2019.16.3 2014 85 vin 408xx. Interestingly the drive unit was replaced a few weeks ago and they said they checked the battery and no issues.
     
  6. First EV

    First EV Member

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    I also did a bug report. I wish they would just tell us why its doing this. Speculation can be bad for pr.
     
  7. FoxSTL2HOU

    FoxSTL2HOU Member

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    Came to post the same. First time we heard the hum was this morning, so unsure when it started (plugged in at 9:30 pm last night but charging is scheduled to start at midnight). Hum was going even after car had charged up but RM was lower than usual (229 vs usual 234) on our 85D. Hum continued until the second half of the morning commute.

    Interest timing and software note - my vehicle was at a Tesla Service Center Monday morning - Tuesday afternoon, at which point it was updated to 2019.16.3.2. No instance of the humming on Tuesday night or Wednesday. Will follow up if this doesn't follow the trend of a second hum and then no more.
     
  8. Droschke

    Droschke Member

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    Looks like they run these BMS maintenance tasks on the older cars (mine is 2015). Not sure if the SC's know about this. Mine did not. I also believe lots of owners just don't notice the noise.

    No one from Tesla has followed up with my bug reports and since I opened this thread. I doubt they will. But, when I was taking to Tesla support line and as the pump was running for the first time, I asked them if they see anything at their end that is being done on my car, they vaguely mentioned they see "something" and the cells' voltage show "ageing"!

    This is definitely appears a post-2109.16.x maintenance routine. It looks like the voltage health checking of the battery modules/cells (mine run for 10 hours and 5 hours in two consecutive days) and make some SW adjustments an/or reconfiguration (my total RM has suddenly decreased by 9% since then), as well as data collection (there were lots of uploads during the time which I reported in this thread). The usable portion of my battery has definitely shrunk (9% RM loss). I think the BMS probably wasn't reporting the correct/safe total RM and charging limits before this and that Tesla is now readjusting it (for fire safety reasons as well???).
     
  9. wdolson

    wdolson Supporting Member

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    When my car was updated to 2019.16.2 the range was down about 4 miles for 2 days and then things returned to normal. I didn't notice any extra noises, but the weather was fairly mild here at the time so maybe the car didn't get warm enough to need to run the pumps or fans during the test.
     
  10. Droschke

    Droschke Member

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    I never figured out if the pump(s) were running for that long to cool or to warm up the pack. I would say probably both to see how the cells were behaving at certain temperatures for the purpose of the tests.
     
  11. JayJ

    JayJ Member

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    Mine had the same noise last weekend. It went off and a while later the noise came back on again. Hour after that it stopped. I haven’t seen any loss in range.
     
  12. Droschke

    Droschke Member

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    Any Rated Miles loss?
     
  13. JayJ

    JayJ Member

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  14. Droschke

    Droschke Member

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    #94 Droschke, Jun 14, 2019 at 12:55 PM
    Last edited: Jun 14, 2019 at 1:13 PM
    Hi Jay - What Tesla model and year, if I may ask?
     
  15. gaswalla

    gaswalla P4201/85/airsusp/pano/19i

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    Checking in with exact same occurrence. 2012 Model S. Charging at 32 amps concluded at 4a to 90 percent and battery cooling noise ongoing for past 4 hours. Seems like the same noise as after a long drive with ambient heat. Will let folks know any updates
     
  16. Droschke

    Droschke Member

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    Sounds like you are going through the same thing. Keep eyes on few things:

    - Runs twice (first time longer than the second time)
    - Runs off the main battery (chews up your miles while it's running)
    - Your overall car's Rated Miles might decrease
     
  17. JayJ

    JayJ Member

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    2013 MS P85+
     
  18. Droschke

    Droschke Member

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    Well, great that your RM is not negatively impacted, even though your car is older than mine.
     
  19. David99

    David99 Active Member

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    I might have some technical info that explains this at least in part.

    There are three coolant pumps in the Model S/X. Two for the battery, one for the drive train (motor/inverter). The reason there are two for the battery is that there are several valves that can redirect the coolant through the radiator or bypass, through the AC chiller or bypass and there is a combination where the loop is divided into to two strings, thus there needs to be two pumps to keep the fluid in motion.

    I have seen the pump going on for hours or intermittently in my S many times. Unless there is a fan blowing at the same time, the intent to run the pump is not to cool the battery. With a battery that large, different sections of the battery can have different temperatures. Since internal resistance depends on temperature, a warmer battery will have lower losses than a cooler one. If individual cells in the pack operate at different temperatures, it eventually causes them to be charged and discharged slightly different from each other. The BMS will counteract to this by balancing the cell blocks. But of course you always want to have all cells to have the same temperature. If they are different, running the coolant will help even out those differences. This is why the coolant pump keeps running at random times.

    10 hours of running the pump seems excessive. I bet this was caused by a bug in the software. Even large differences in temperature will be gone within an hour or running the pump.

    Here is a screen shot showing the different cell blocks and the temperature difference between them.
    Screenshot_2017-02-01-18-37-08.png
     
  20. Droschke

    Droschke Member

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    The good info you are providing makes sense. But this event was not a routine battery cooling exercise as it ran twice and for very long hours. Not a SW either as the intention was to collect data and for those who are reporting a significant range loss after 2019.16.x ""this was done to prolong the life of the battery and reduce the pack wear" according to Tesla. Read here .
     

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