Applies to: APS1
What does Scania APS fault code 129 mean?
The supply voltage to the control unit has dropped below 20 volts.
What causes Scania DTC 129?
Damage to wiring or a fault in the vehicle's power supply system.
How does the system react?
The fault does not affect functionality. The system attempts to regenerate and control the pressure as long as the solenoid valves can be activated. The fault code occurs when the voltage has dropped below 20 V for more than 5 seconds. Yellow warning lamp comes on.
How to fix Scania APS fault code 129?
- Check the wiring and the vehicle's power supply system.
- Clear the fault code.
This information is for guidance only. Always follow the manufacturer workshop manual and safety procedures; if in doubt, contact an authorised workshop.