ETC 002000.09 – Incorrect CAN BUS Message, Coolant Temperature from ECU

ETC 002000.09 (ETC 2000.09)

Code: 002000.09

Shortcode: 2000.09


The error code ETC 002000.09 is generated when there is a data transfer problem between the ECU and ETC regarding coolant temperature. Reception of the CAN message about coolant temperature is intermittent or nonexistent, which could be due to a loose wire or other communication issues.


When this fault is detected, the control unit may limit or disable certain functions that rely on accurate coolant temperature data, potentially leading to improper engine management and cooling system performance.


Inspect CAN BUS Network:

  • Check Wiring and Connections: Inspect all CAN BUS wiring and connectors between the ECU and ETC for signs of damage, loose connections, or corrosion. Repair or replace any compromised wiring.
  • Measure Signal Integrity: Use diagnostic tools to measure the integrity of the CAN BUS signals. Look for signal degradation, interference, or intermittent connectivity.

Test and Replace Components:

  • Test CAN BUS Modules: Verify the operation of all CAN BUS modules involved in the communication. Replace any modules that are found to be malfunctioning or contributing to communication issues.
  • Inspect ECU and Control Unit: Ensure that both the ECU and the ETC control unit are functioning correctly. Replace any faulty components as necessary.

Update and Reconfigure:

  • Software Updates: Apply any available firmware or software updates to the ECU and control units to ensure they are operating with the latest fixes and improvements.
  • Reconfigure Network: Reconfigure the CAN BUS network settings if necessary to optimize performance and reduce error rates.


Maintaining a reliable CAN BUS network is critical for vehicle operations. Regular inspections and timely repairs of the network components can help prevent communication errors and ensure proper data transfer between control units.

Control Units: John Deere

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