Scania fault code 857
Code 857 is used by 3 different Scania systems. Choose the control unit shown in your diagnostic tool:
BMU Battery Management Unit
Battery module 4 in propulsion battery, CAN communication interrupted
Communication with battery module 4 in the propulsion battery was interrupted.
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VDT
CAN bus
Invalid value in CAN message from the EMS control unit.
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COO Coordinator
Drive mode selector
The control unit interprets signals from the drive mode selector as implausible.
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