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Loud sustained whine after powering off

Posted: Fri Jul 20, 2018 7:37 pm
by bmori
Hello,
I got my used 2015 Nissan Leaf about a week ago and today there was a new noise. When I shut the car off, it started making a very loud sustained high pitch noise near the dash. I walked out of the car and checked that the noise was not coming from under the hood. It was the loudest by the dashboard.

It went away after about 5-10 minutes. Then when I got home and shut off the car it happened again. It again stopped after about 5-10 minutes.
I recorded some of it if you want to hear:
https://drive.google.com/file/d/1CJkreS ... jMVJb/view

I found out today that the 12 volt battery needs to be replaced. Maybe these are related.

If anyone has an idea of what this is I would appreciate any tips.
thanks

Re: Loud sustained whine after powering off

Posted: Tue Jul 24, 2018 11:51 am
by brenton
Did it sound like a notification sort of sound or like some accidental sound? In other words, was the car intentionally indicating something to you. e.g. did it sound like the "door open" or "lights on" chime, or did it sound like some sort of capacitor buzzing or something unintentional like that?

Re: Loud sustained whine after powering off

Posted: Thu Sep 27, 2018 6:12 pm
by bement
Hello, did you find the cause of this sound? My car began doing the same thing this morning and I now have a ev system warning light on.

Re: Loud sustained whine after powering off

Posted: Mon Nov 26, 2018 4:40 pm
by pmb2016Leaf
Any update on this issue? Was it the 12v battery? My 2016 has now done this two days in a row. Same symptoms, after shutting it off a loud sustained whine that continues for several minutes, then stops. While it is making the noise I can't start the car. It may initialize after a couple tries but the power steering and brakes are not operable. Come back later and it seems to work again. I could post an identical audio of the sound as the original poster. I'm planning to call the dealer in the morning.

Update: The issue turned out to be a bad cell in the 12v battery. The dealer replaced it under warranty and the issue is resolved. We had a cold snap that explains the sudden appearance of the issue with the 12v battery, as would be the case with an ice vehicle.

Re: Loud sustained whine after powering off

Posted: Sat Jan 26, 2019 1:22 pm
by micahbartlett
Wondering if you found an answer to this. My 2011 is making the same noise. It only turns off if I unhook the 12V battery.
Any help is appreciated.
https://youtu.be/ilFQ4Tkv2UM

Re: Loud sustained whine after powering off

Posted: Sat Jan 26, 2019 2:30 pm
by LeftieBiker
Are you leaving the headlight switch on? Because the car will make a sound much like that if you leave the lights on...

Re: Loud sustained whine after powering off

Posted: Wed Sep 11, 2019 3:10 pm
by LJensen
Our 2012 is doing the whine this very moment, has been for about 15 minutes now. We have unplugged the 12v and it continued to make the noise.

Any other ideas?

Re: Loud sustained whine after powering off

Posted: Thu Dec 03, 2020 6:54 pm
by greytwist
I just had the same issue with my 2015. One day it wouldn't actually start (would not go into gear and the dash lights were all on). I plugged it in and got it to start later that afternoon. I had weird intermittent problems with it over the next few days. Once it started but the red brake light and car with exclamation mark was lit up (EV SYSTEM warning). Random issues with it not going into gear. Mostly seemed like if I had the radio off, seat, searing , and heater off it would start. Finally one day it wouldn't regen brake and wouldn't charge after plugging it in. This was over the coarse of a week. I had the exact buzzing sound a few times when I turned if off too. Took it to the dealership and they replaced the 12V battery and everything is back to normal. I hope this helps save some people some heart ache and money in the future. Just replace 12V battery (check connections and battery terminals et al. ). Good luck and happy leafing