If loud (shrill) noises are heard coming from the engine compartment, a possible cause could be a malfunctioning of the high-pressure pump.
In such cases defective software for the engine control unit can be responsible for the noise generation.
Remedy:
In order to exclude other sources which might be causing the problem, first check the system's periphery (high-pressure pump etc.). If no faults are detected here, a software update of the engine control unit is required.
Please contact an authorized specialist workshop for this to be carried out.
Important safety note
Technical information and practical tips have been compiled by HELLA in order to provide professional support to vehicle workshops in their day-to-day work. The information provided on this website is intended for use by suitably qualified personnel only.
Reprinting, distribution, reproduction, exploitation in any form or disclosure of the contents of this document, even in part, is prohibited without our express, written approval and indication of the source. The schematic illustrations, pictures and descriptions serve only for the purposes of explanation and representation of the instructions and cannot be used as a basis for installation or assembly work. All rights reserved.
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