Scania fault code 5377
Code 5377 is used by 3 different Scania systems. Choose the control unit shown in your diagnostic tool:
EMS Engine Management System
Voltage supply
The voltage has been below the permitted level for one of the sensors which has a shared voltage supply.
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MGU
Electric machine, invalid calibration values
The rotation in the electric machine does not correspond to the rotation that the position sensor for the electric machine has interpreted.
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AMS
Reductant circuit, unstable pressure
The reductant pressure has been outside the permitted range for too long.
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