How to Decode CAN Bus Error Frames and Voltage Readings
When a CAN bus goes down, identifying the root cause requires more than a basic connectivity check. The key is learning how to interpret the signals and protocol behavior that reveal what the network is experiencing. By understanding normal CAN voltage levels, recognizing abnormal readings, and decoding error frames, engineers can quickly trace issues such as wiring faults, termination problems, interference, or failing nodes. Mastering both the electrical and protocol layers transforms troubleshooting from trial-and-error into a systematic diagnostic process.
