John Deere 1500 – E02: Missing Cornerpost CAN Bus Message

The system has detected that a CAN Bus message related to machine configuration is missing from the Cornerpost Control Unit (C03). The Right Control Unit (E02) has failed to receive this essential data, which can disrupt the proper communication and operation of the machine's configuration settings across the electronic modules.

• 9450
• 9550
• 9650
• 9650 STS
• 9750 STS
• 9560 STS
• 9660
• 9660 CTS
• 9660 STS
• 9760 STS
• 9860 STS
• 9540
• 9560
• 9580
• 9640
• 9680 WTS
• 9780i CTS
• i-series models
• 7630
• 7730
• 7830
• 7930
• 8130
• 8230
• 8330
• 8430
• 8530
• 9230
• 9330
• 9430
• 9530
• 9630

1. 1

   Access and review the machine's diagnostic display for all active and stored DTCs to identify any other CAN bus-related codes

2. 2

   Visually inspect the wiring harness and connectors between the Cornerpost Control Unit and the logging control unit for damage, abrasion, or corrosion (pay close attention to main connector X500)

3. 3

   Check the CAN bus wires (Red 12V Power, Black Ground, Yellow CAN High, Green CAN Low) to ensure they are intact and securely connected

4. 4

   Verify that the Cornerpost Control Unit is receiving proper power and has a solid ground connection

5. 5

   Check for 'Bus Off' errors, which indicate a short in the CAN wiring or a faulty controller

6. 6

   Inspect the CAN bus termination resistors (often located behind the warning light panel or near the exterior cab filter) for faults or missing resistors

1. 1

   Cycle power

   Turn the machine off, wait for at least 30 seconds, and then restart it to see if the intermittent communication code clears.

2. 2

   Disconnect and reconnect

   Disconnect the main connector (e.g., X500) from the Cornerpost Control Unit and securely reconnect it to resolve issues caused by a poor connection.

3. 3

   Isolate the fault

   If multiple controllers are logging communication faults, troubleshoot for a network-wide issue. If only one controller is logging the fault against the cornerpost, focus on the Cornerpost Control Unit itself or its specific connection.

4. 4

   Replace Cornerpost Control Unit

   If wiring and connections are confirmed good and the fault persists after a power cycle, replace the Cornerpost Control Unit. It may have an internal failure such as an EEPROM test failure at power-up or an inability to exit its boot program.