Communication error. The CAN-controller of the HCU CAN bus has entered state bus-off. There might be a short circuit on the HCU CAN bus
No repair guidance recorded for this DTC.
What you'll see
No driver-visible symptom recorded.
System reaction
• Functions dependent on information on the HCU CAN bus from ACUB1 might be degraded. Examples listed below. - Secondary braking not working (EPB). - Degraded autonomous function.
Diagnostic depth
The DTC is set to active if CAN controller of the HCU bus is in the state bus-off. The DTC is set to inactive if the CAN-controller is not in state bus-off for 1100 ms. The DTC is not validated (stored) if: • the ignition is turned off • first 2 seconds after ignition on • the supply voltage is below 22 volt • the supply voltage is above 32 volt
• Defect wiring of HCU CAN-bus: - short circuit between CAN-high and CAN low. - short circuit between CAN-high and supply voltage. - short circuit between CAN-high and ground. - short circuit between CAN-low and supply voltage. - short circuit between CAN-low and ground. • Defect ECU unit(s) on the HCU CAN bus.