Communication with the retarder
â–¶ How to fix
Check the connection to the retarder.Check the red CAN bus cable harness and connectors. Check the EOL parameter settings in the instrument cluster.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
No CAN messages from the retarder, which is controlled by the gearbox management system.
Possible cause
The retarder is not connected to the CAN bus.Incorrect parameter settings in the instrument cluster.