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 notice
The following technical information and tips for practical use have been set up by HELLA in order to offer professional support to automotive workshops in their daily work. The information available here on this website is only to be used by appropriately trained specialist staff.
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