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Rear Grind Noise When Turning With Traction Off Only

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Old Feb 27, 2025 | 07:07 PM
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2001 E55 AMG
Rear Grind Noise When Turning With Traction Off Only

Question, my 2017 c63s makes somewhat of a "grinding" noise when traction is in sport or completely off when pressing the gas pedal and turning at a slow speed with the steering wheel fully locked to the right or left. Is that normal?
If I turn the traction on, there is no noise.
Is that normal? When I turn the traction fully off, the car feels like it has a welded diff and the noise is very loud when doing figure 8 at the slow speeds (5mph or so).

Last edited by Anatoly; Feb 27, 2025 at 08:06 PM.
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Old Mar 2, 2025 | 12:57 AM
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18 c63 s sedan
Odd. Do you think it’s the ELSD in the rear? I would imagine what traction control off and the more aggressive modes the tuning for the ELSD will change, and thus lockup would be different.

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Old Mar 2, 2025 | 11:59 AM
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2001 E55 AMG
Yeah, I'm 99% sure it's my rear diff. Taking it to the shop tomorrow to test it.
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Old Mar 2, 2025 | 12:17 PM
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18 c63 s sedan
Has the rear differential fluid been changed at the appropriate intervals and the correct viscosity? Every once in a blue moon, when I put it in reverse and turn, you’ll hear an ever so slight knock as the clutch pack is unlocking.

It is super super rare, but not uncommon. Even my MK3 supra did it and that was just a traditional LSD.
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Old Mar 2, 2025 | 01:37 PM
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yeah, the fluid was changed 1k miles ago. Going back to that shop to make sure they put the correct one, since on the invoice when they did it it stated "no noises" etc.
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Old Jun 3, 2025 | 12:46 AM
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2018 c63s coupe
Have you figured this out? Mine does loud grinding noises whenever turning at low speeds in traction sport/off
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