PLC 328030.31 – Incorrect CAN BUS Message, Information from TCU

PLC 328030.31 (PLC )

Code: 328030.31



This diagnostic trouble code is generated when there is a data transfer problem between the TCU (Transmission Control Unit) and PLC (Programmable Logic Controller). Reception of one, several, or all of the CAN messages transmitted by the TCU is intermittent or nonexistent. This could be due to a loose wire or other communication issues.


The equipment may experience degraded performance or fail to operate correctly due to the loss of critical data from the TCU. Systems dependent on CAN BUS communication may not function as intended.


  • Inspect CAN BUS Wiring:
    • Check for any loose, damaged, or corroded wires in the CAN BUS network. Repair or replace as necessary.
  • Verify Connections:
    • Ensure that all connectors are properly seated and secure. Tighten any loose connections.
  • Test Communication:
    • Use diagnostic tools to test the CAN BUS communication between the TCU and PLC. Identify and address any issues found.
  • Update Software:
    • Ensure that both the TCU and PLC have the latest software updates to improve communication reliability.
  • Check for Interference:
    • Identify and mitigate any sources of electromagnetic interference that might affect CAN BUS communication.


Regular maintenance and inspections of the CAN BUS network can prevent communication issues, ensuring reliable operation of systems dependent on TCU data.

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