Mercedes Steering Rattles and Hums

March 31, 2023
Mercedes-Benz vehicles equipped with electric power steering, such as the 2016 C300, may emit a rattling/humming noise from the electric steering system when steering. The issue may not impact the ability to steer or control the vehicle.

This bulletin applies to Mercedes-Benz vehicles equipped with electric power steering, such as the 2016 C300.

A rattling/humming noise may be heard from the electric steering system when steering. The issue may not impact the ability to steer or control the vehicle.

The ball screw drive (KGT) of the electric steering unit may be damaged by external force, including hitting curbs with the front wheels, driving over obstacle such as potholes at an inappropriate speed, corrosion/water ingress through a damaged boot.

Inspect the boots for cracks, holes caused by a high pressure cleaner, animal bites, etc. The fix involves replacing the electric steering assembly.

ART: BENZ (courtesy Mitchell1)

CAPTION: Inspect steering boots for damage.

About the Author

Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.

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