Scania fault code 856
Code 856 is used by 3 different Scania systems. Choose the control unit shown in your diagnostic tool:
BMU Battery Management Unit
Battery module 3 in propulsion battery, CAN communication interrupted
Communication with battery module 3 in the propulsion battery was interrupted.
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VDT
Internal fault
Permissible engine torque is exceeded during gear changing.
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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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