Scania fault code 4227
Code 4227 is used by 3 different Scania systems. Choose the control unit shown in your diagnostic tool:
EMU
Heater H40, internal fault
The heater is reporting that the primary transistor current is over 500 mA, while the PWM signal to both heater elements is low.
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BMU Battery Management Unit
Cell monitoring circuit board, internal fault
Chip for cell balancing in a cell monitoring circuit board reports faults.
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DDU
Guide microphone, short circuit to earth
Information is missing, update is in progress.
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