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High pitched sound from engine

Tiny
L TIATOM
  • MEMBER
  • 2011 HYUNDAI I20
  • 1.2L
  • 4 CYL
  • 4WD
  • 45,000 MILES
Start the engine, and turn off after sometime.

Now, the high pitched sound as shown in the video goes away as soon as the IASC connector is unplugged.

When it's plugged inside again, the sound still exists!!!!

Why is it so?? Please it's emergency.

https://youtu.be/FTjreU2UJw8
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Sunday, March 15th, 2020 AT 7:11 AM

8 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

I could not hear the sound in the video.

What exactly did you disconnect?

Are there any codes set?

Roy
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Sunday, March 15th, 2020 AT 4:09 PM
Tiny
L TIATOM
  • MEMBER
  • 61 POSTS
High pitched buzzing sound.

I disconnected the IASC connector and the buzzing or like humming bee sound goes away.

No trouble codes at all.
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Sunday, March 15th, 2020 AT 5:48 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, is there any running issue with the engine at all?

It sounds like the solenoid itself.

Roy
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Monday, March 16th, 2020 AT 4:51 AM
Tiny
L TIATOM
  • MEMBER
  • 61 POSTS
Nope. No issues at all in every aspects performance, pick up etc.

Only this buzzing sound which I noticed recently.

Surprise is that as soon as the IASC connector is unplugged, the sound stops.

How to rectify this loud buzzer sound?
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Monday, March 16th, 2020 AT 6:42 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
The solenoid may be actuated by the ECM but needs to be confirmed.

As I stated in my last response, it may be the solenoid itself that is the issue.

Roy
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Monday, March 16th, 2020 AT 6:46 AM
Tiny
L TIATOM
  • MEMBER
  • 61 POSTS
If it's the solenoid, is it a serious issue?

Or how do I fix that solenoid?

The IASC connector has 3 pins of which the 2 pin is 12 volt.
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Monday, March 16th, 2020 AT 9:11 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You do not fix it, you replace it.

You need to have someone check it for you with a scan tool to see if it is the solenoid or the signal from the ECM.

Roy
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Monday, March 16th, 2020 AT 9:16 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
I hear the sound. can you tell me if the battery is okay condition? here is a guide to help load check it. it sounds like a low voltage problem to me.

https://www.2carpros.com/articles/car-battery-load-test

Please run down this guide and report back.

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Monday, March 16th, 2020 AT 10:41 AM

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