Scania fault code 859
Code 859 is used by 2 different Scania systems. Choose the control unit shown in your diagnostic tool:
BMU Battery Management Unit
Battery module 6 in propulsion battery, CAN communication interrupted
Communication with battery module 6 in the propulsion battery is interrupted.
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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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