Applies to: OPC4 (RET)OPC5 (RET2)
What does Scania RET fault code 21025 mean?
Timeout from the AWD system.
What causes Scania DTC 21025?
If one or all CAN messages expected from the AWD system are missing, this fault code will be generated.
How does the system react?
For vehicles without Opticruise/Comfort Shift, retarder braking will not be possible and a warning indication will be displayed. For vehicles with Opticruise/Comfort Shift without a fault in the mainshaft rotational speed sensor (T83), the system will not be degraded. For vehicles with Opticruise/Comfort Shift and a fault in the mainshaft rotational speed sensor (T83), retarder braking will not be possible and a warning indication will be displayed. When this fault code is generated, the retarder will not work until the control unit has been restarted.
How to fix Scania RET fault code 21025?
- Check CAN connections, harness-to-harness connectors and cable harnesses.
- Also check the AWD control unit.
This information is for guidance only. Always follow the manufacturer workshop manual and safety procedures; if in doubt, contact an authorised workshop.