Scania fault code 4187
Code 4187 is used by 3 different Scania systems. Choose the control unit shown in your diagnostic tool:
EMU
Refrigerant compressor E157, internal fault
The refrigeration compressor reports too high a VCB voltage (above 850 V). The fault code may expire by itself, the refrigeration compressor updates the status every 10 seconds.
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BMU Battery Management Unit
Propulsion battery positive contactor, number of permissible actuations exceeded
The positive contactor has reached the maximum number of actuations permitted during its service life.
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DDU
Switch module in the steering wheel for instrument cluster: Menu navigation, right-hand, no signal
Information is missing, update is in progress.
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