Applies to: CUV1
What does Scania CUV fault code 121 mean?
All control unit inputs from S1 have been short circuited to ground for more than two minutes.
What causes Scania DTC 121?
Short circuit in the switch or the wiring.
How does the system react?
Dipped beam will be lit. The fault code is only found on control unit version with assembly part number 1482564 and 1540437.
How to fix Scania CUV fault code 121?
Check the switch.
This information is for guidance only. Always follow the manufacturer workshop manual and safety procedures; if in doubt, contact an authorised workshop.