A faulty alternator controller may cause sporadic failures of the radio display in the above vehicles. Furthermore, the engine may enter the emergency mode.
This is often accompanied by the following error codes:
Body Control Module (BCM): B1517 (battery voltage)
Engine control unit: P0621 (alternator failure)
P0622 (alternator failure)
To remedy this, a modified alternator controller (93744610) should be installed.
Modified controller have already been used in production from the following VINs:
W0LLA63F870094862 – for engine code Z20DM/Z20DMH
W0LLA63F170151709 – for engine code Z24XE
W0LLA63F370094865 – for engine code Z32SE
Note: Delete the fault memory after the repair.
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.
The reprinting, distribution, reproduction, exploitation in any form and 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, figures and descriptions are for explanation and presentation of the document text and cannot be used as a basis for installation or design. All rights reserved.
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