Scania fault code 839
Code 839 is used by 6 different Scania systems. Choose the control unit shown in your diagnostic tool:
BMU Battery Management Unit
Propulsion battery cooling circuit, very high temperature
Extreme temperatures detected in the propulsion battery.
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VDT
Connections to the gearbox control unit
Connector B in the gearbox control unit is disconnected.
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COO Coordinator
CAN communication with switch module
Fault in communication with the switch module.
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MBS
Primary temperature sensor for passenger area, implausible value
The primary 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 battery
Solenoid valve type 3/2 for tag axle lift, PWM output 6 (pin A30), is short-circuited to battery.
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DCC
High voltage supply
The DCC control unit supply voltage has been or is greater than 30 V.
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