MTU 8 V 4000 Lx2 xx Operating Instructions Manual page 94

1.4550.143 – B - CAN Fault (CAN Bus Off, CAN Ad)
Red alarm. Initiated by ProAct B-Bank.
Cause
CAN bus connection faulty.
1.4550.144 – B - CAN Stop Command
Yellow alarm. Initiated by ProAct B-Bank.
Cause
"Stop" input signal received via
CAN bus
94 | Troubleshooting | MS150114/01E 2015-03
Corrective action
u Check cabling and setting.
Corrective action
u Check setting.