Scania fault code 840
Code 840 is used by 6 different Scania systems. Choose the control unit shown in your diagnostic tool:
BMU Battery Management Unit
Propulsion battery cooling system, emergency stop
Extreme temperatures in the propulsion battery or propulsion battery heater which do not decrease after a few minutes. The vehicle is shut down to avoid heat damage.
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VDT
Connections to the gearbox control unit
Connectors A and B in the gearbox control unit are disconnected.
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COO Coordinator
CAN communication with switch module
Fault in communication with the switch module.
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MBS
Secondary temperature sensor for passenger area, implausible value
The secondary temperature sensor for the passenger area displays an implausible value.
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CMS
Solenoid valve type 3/2 for tag axle lift, short circuit to earth
Solenoid valve type 3/2 for tag axle lift, PWM output 6 (pin A30), is short-circuited to earth.
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DCC
Internal fault in the direct current converter
Incorrect temperature signal internally in the direct current converter.
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