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GLS450 howling in reverse

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Old Jun 21, 2021 | 10:34 PM
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2017 GLS 450
GLS450 howling in reverse
I have a 2017 GLS450 and when I back in reverse into my driveway into my garage which is in a incline, I can I hear a howling noise coming from the front area. I’m assuming something to do with the front drivetrain area like front differential or transmission? Anyone have similar issues. It’s not super loud, but you can hear it.
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Old Jun 21, 2021 | 11:43 PM
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Howling suggests a higher frequency sound, not connected with low vehicle speed drivetrain while backing into the garage.

Sounds like a fan or pump. What do you think?
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Old Jun 22, 2021 | 01:15 AM
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2017 GLS 450
Originally Posted by chassis
Howling suggests a higher frequency sound, not connected with low vehicle speed drivetrain while backing into the garage.

Sounds like a fan or pump. What do you think?
Not sure it’s kinda weird it happens only backing up on steep inclines at slow speed
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Old Jun 22, 2021 | 09:10 PM
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Please post a video with sound when the howling happens.
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Old Jun 23, 2021 | 01:01 PM
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2017 GLS 450
Originally Posted by chassis
Please post a video with sound when the howling happens.
okay I’ll try soon. But it sounds like a howl/groaning noise
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Old Jun 23, 2021 | 09:37 PM
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Got it. The video with sound will help.
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Old Jun 24, 2021 | 11:44 AM
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2017 GLS 450
Update! Fixed!
Originally Posted by chassis
Got it. The video with sound will help.
UPDATE! FIXED!
I replaced the transfer case fluid and put new fluid in. Found Li document stating to replace transfer case fluid for whining noise in reverse. I will update if noise comes back!
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Old Jun 24, 2021 | 11:46 AM
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Thanks for sharing.
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Old Sep 1, 2021 | 03:20 PM
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2018 Mercedes Benz GLS 450
Getting the same noise on my 2018 GLS 450 w/67k. in reverse, I will go ahead and replace the tansfercase oil and update the thread.
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Old Sep 2, 2021 | 11:25 PM
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2018 Mercedes Benz GLS 450
Originally Posted by mike10872
Getting the same noise on my 2018 GLS 450 w/67k. in reverse, I will go ahead and replace the tansfercase oil and update the thread.
UPDATE: Drain and refilled the transfercase and the noise stopped. The old oil did not look bad at all, replacing it helped. Thanks.
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Old Sep 2, 2021 | 11:29 PM
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2017 GLS 450
Originally Posted by mike10872
UPDATE: Drain and refilled the transfercase and the noise stopped. The old oil did not look bad at all, replacing it helped. Thanks.
That’s great to hear! Yeah my fluid looked fine when I drained it.
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Old Sep 3, 2021 | 09:00 AM
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2018 Mercedes Benz GLS 450
Originally Posted by Gfernando15
That’s great to hear! Yeah my fluid looked fine when I drained it.
thanks, it was also heard backing up on inclines (forget to add this)
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Old Sep 3, 2021 | 09:46 AM
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2017 GLS 450
Originally Posted by mike10872
thanks, it was also heard backing up on inclines (forget to add this)
yeah mine only happened on inclines
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