Scania fault code 646
Code 646 is used by 4 different Scania systems. Choose the control unit shown in your diagnostic tool:
BMU Battery Management Unit
The measured value for the current sensor is outside the permitted range
The current value from the propulsion battery is outside the permitted maximum value. If the current has been above 950 A the propulsion battery main fuse has tripped. If the curre…
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MBS
Expansion unit M, initiation
No communication with expansion unit M after initiation.
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CUV Visibility system
Control unit
Internal fault in the control unit.
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BCI
Overload, C259-15
Overload at output. Current drawn at output exceeds 0.5 A.
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