ATC 002000.09 – Incorrect CAN BUS Message, Coolant Temperature from ECU. John Deere System Advisory.

ATC 002000.09 (ATC 2000.09)

Code: 002000.09

Shortcode: 2000.09


The error code, ATC 002000.09, is triggered when there is a data transfer problem between the Engine Control Unit (ECU) and the Automatic Temperature Control (ATC) system. This issue involves the intermittent or nonexistent reception of the CAN message that communicates the coolant temperature. Such reception problems could be due to a loose wire or connectivity issues within the CAN BUS network.


This communication error may lead to the ATC system receiving incorrect or delayed information regarding engine coolant temperature, potentially affecting the HVAC system’s ability to adjust cabin temperature appropriately. It may also impact engine management and safety if related systems are informed inaccurately about engine temperatures.


  • Inspect CAN BUS Connections: Check all CAN BUS connections, particularly those between the ECU and ATC system, for looseness, corrosion, or damage.
  • Test CAN BUS Integrity: Utilize diagnostic tools to test the integrity and functionality of the CAN BUS. Look for errors or poor connections that could disrupt communication.
  • Secure Loose Wiring: Ensure that all wiring is properly secured and making good contact. Tighten any loose connections and replace damaged wires or connectors.
  • Reprogram or Reset Modules: Consider reprogramming or resetting the affected modules to ensure that all settings are correct and that the modules can properly communicate.
  • Monitor System Performance: After repairs, monitor the system performance to ensure that the CAN BUS messages are being transmitted and received without interruption and that the correct coolant temperature is being reported.


Maintaining robust and reliable communication across control systems is crucial for the safe and efficient operation of machinery. Regular monitoring and maintenance of the CAN BUS and associated electronics are essential to prevent communication failures and ensure that the equipment operates smoothly. Addressing communication issues promptly is key to minimizing downtime and maintaining operational efficiency.