CAN Bus-Off State

What does ce4 mean?

The controller has entered a 'Bus-Off' state, meaning it has detected and received too many faulty telegrams on the system bus and has consequently disconnected itself. This indicates severe bus communication issues, such as incorrect termination, poor shielding, or excessive bus load. Being 'Bus-Off' means the controller cannot communicate, halting operations.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Ensure the protective earth (PE) connection for the controller and bus components is secure.

2. 4

   Assess the bus load and, if necessary, reduce the baud rate to improve communication reliability.