GL Class (X166) 2013-2015 after facelift became GLS (X166)

Buzzing noise from GL450

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Old Nov 29, 2025 | 03:50 PM
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GL450
Buzzing noise from GL450

Hello:

I have a 2012 GL450 with 90K miles. Recently I found the car was making buzzing noise when running. When the car is about to stop, for example before a traffic light, the noise will stop. Other than that, the car runs OK.
The noise is very simiar to what someone posted before in this video
. My noise is similar to the noise in the video from the begining to 0:05. I do not have the high pitch noise in the video at 0:05-0:06.
It felt that the noise was related to some electrical parts.
Had anyone had simiar issue before? I really appreciate if someone can help find what the problem is.

AC
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Old Dec 7, 2025 | 12:09 AM
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GL450
Radio turn on by itself

I also found the radio sometime turned on by itself. Can any help what the root cause maybe?
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Old Jan 18, 2026 | 10:23 AM
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2021 GLS580
OMG! I’ve NEVER heard this before having owned a handful. This sounds like an electrical nightmare. Have you pinpointed what area it’s coming from?
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