HCU CAN - Bus-off
â–¶ How to fix
Check short-circuits and open circuit on lines ParkingBrake CAN, Check the ParkingBrake CAN wiring (including check for chafing damage), Assure that ParkingBrake CAN connected ECUs work correctly.
What you'll see
No driver-visible symptom recorded.
System reaction
HCU is not used, manual functions are not available. Yellow warning lamp.
Diagnostic depth
Detection
ParkingBrake CAN controller went to bus-off state (detected by uC peripheral)
Possible cause
Electromagnetic disturbance, ParkingBrake CAN network cabling, power supply or node errors