Mercedes-Benz AMG C43 2017–2025 — technical service bulletin

Bulletin LI35.31-P-066469 · NHTSA communication 11015616 · issued Mar 12, 2025

Technical service bulletin

communication type

Power Train

component

2017–2025

model years

vehicle entries

Official summary

Complaint Possible humming noises from the drivetrain in the area of the rear axle, especially during tight cornering in the lower speed range. Cause Additives in rear axle differential oil Remedy Note: Please follow the instructions in this document. The replacement of components (other than those named for processing) is not effective. Remedy: A test drive must be performed. For accurate analysis (localization) of the noise, the "Steelman Chassis Ear" noise diagnosis kit can be used, for example. If the rear axle differential is unambiguously identified as the cause (noise source), the oil m

Vehicles covered

What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.