Complaint 1. Noises in recovery mode with the vehicle stationary 2. Noises when driving in a straight line...

Bulletin number

LI32.50-P-074277

Component

Suspension

Summary

Complaint 1. Noises in recovery mode with the vehicle stationary 2. Noises when driving in a straight line on rough terrain 3. Noises when cornering and performing alternate steering movements 4. Non-assignable noises Cause Complaint 1. Noises in recovery mode with the vehicle stationary Complaint 2. Noises when driving in a straight line on rough terrain Cause: These are normal operating noises of the hydraulic high-pressure pumps. Remedy Generally check whether the same noises also occur in ECO mode - in this mode the Preview/ROAD SURFACE SCAN function is deactivated and the high-pressure pumps run at reduced speed. Consequently, it is possible to differentiate between normal operating noises and unusual noises. Regarding 1, 2: Explain the high-pressure system, replacing the suspension struts or pumps is not useful, as these noises are caused by the high-pressure pump unit and should be regarded as normal operating noises. Regarding 3: This is currently a normal operating noise and represents the series production configuration; consequently replacing the components is not useful. Regarding 4: There will certainly be other unknown noises that we are not yet familiar with; therefore please report these as well. For all complaints, create a PTSS case and include: 1) Informative video recordings of the noises. 2) The driving situation in the drive program in which the noises occur should be shown. 3) For comparison, also attach a recording of this same driving situation in ECO mode. 4) Additional attachments required: - Logs for control units N51/8, M67, M67/1, M67/2, M67/3 - Actual values for the pressures of the four hydraulic high-pressure pumps at standstill

Owners of these vehicles have filed 3 complaints in the suspension category.