Scania fault code 4390
Code 4390 is used by 3 different Scania systems. Choose the control unit shown in your diagnostic tool:
EMS Engine Management System
Cylinder balancing, cylinder 6
The highest level to which the control unit can adjust the fuel volume for the cylinder has been reached.
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BMU Battery Management Unit
Battery module 6, cell monitoring circuit board, minor internal fault
The cell monitoring circuit board has detected an internal error and is having trouble monitoring the status of the battery module.
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DDU
Control unit, internal fault
The control unit interprets an internal fault.
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