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Unusual noise around 25 mph

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Old Apr 18, 2026 | 12:51 PM
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altay's Avatar
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2020 GLC300 4matic, 2017 C300 4matic
Unusual noise around 25 mph

Hi all,

2019 s560 rwd. I am hearing unusual noise from engine bay. Sounds like EV vehicle accelerating Starting 20 mph, most pronounced around 25 mph and goes away over 30 mph.

not AC related, not engine rpm related.

anyone experienced this before?

thanks
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Old Apr 19, 2026 | 09:40 AM
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63 Falcon vert
At 25mph and shift to N…..noise still there?
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Old Apr 21, 2026 | 02:12 PM
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2020 GLC300 4matic, 2017 C300 4matic
Originally Posted by Donnymac
At 25mph and shift to N…..noise still there?
I am hearing it when I give slight throttle input. Otherwise no noise around that speed
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Old Apr 21, 2026 | 02:44 PM
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Find a safe place to do this. At the speed that the noise is happening turn the steering wheel left and then right and listen to see if the noise goes away. If it does you need a new front wheel hub bearing. VERY easy to replace.
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Old Apr 22, 2026 | 03:13 PM
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Originally Posted by altay
I am hearing it when I give slight throttle input. Otherwise no noise around that speed
If you’re eliminating the motor as a source to include electronic components, you’re left with rotational trans and driveline which includes hub assemblies/bearings per Katie22.

Noise occurs with a/c on off?

Car mileage?
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Old Apr 25, 2026 | 01:56 PM
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2019 560

Originally Posted by altay
Hi all,

2019 s560 rwd. I am hearing unusual noise from engine bay. Sounds like EV vehicle accelerating Starting 20 mph, most pronounced around 25 mph and goes away over 30 mph.

not AC related, not engine rpm related.

anyone experienced this before?

thanks
I have the same year and engine. At a modest (20-45 mph) cruise or light low speed accelaration I hear a slight wooshing type sound. If I accelerate quickly or am completely off the pedal, the noise goes away. I beleive it to be the inlet air passing over the turbo impellars.
If this is what you are experiencing, it is nothing to worry about.
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