Scania fault code 20
Code 20 is used by 9 different Scania systems. Choose the control unit shown in your diagnostic tool:
EMS Engine Management System
Exhaust valve cam phaser, position fault
Exhaust valve cam phaser cannot hold the reference position.
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VDT
Rotational speed sensor
Short circuit between sensors.
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COO Coordinator
Red CAN bus
All communication on the red CAN bus has been interrupted.
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ABS Anti-lock Braking System
Wheel speed
The current in the wheel circuit on the left-hand side of the front axle has been above the permitted level.
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CUV Visibility system
Windscreen wiper, Low speed.
Current consumption on the control unit output has exceeded 15 A for 1 second, or 12 A for 10 seconds. On control unit versions with assembly part number 1482564, 1540437 and 15271…
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ACC Automatic Climate Control
Fan motor
The fan does not work correctly.
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ACS Articulation Control System
Communication with the GMS control unit
Signal from GMS missing.
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BCS
Start signals
Conflicting start signals from the starter switch in the engine compartment.
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CTR
Communication with the heater
Missing response from the heater.
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