Scania fault code 4377
Code 4377 is used by 2 different Scania systems. Choose the control unit shown in your diagnostic tool:
BMU Battery Management Unit
Battery module 9, electrical fault
The cell monitoring circuit board has detected faults in the electrical cable that connects to the individual battery cells.
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DDU
GMSL link in the control unit, voltage too low or high
Incorrect voltage detected by the GMSL link.
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