John Deere 639.13 – XMC: CAN Bus Messages are Being Lost

A control unit on the SAE J1939 CAN bus network is detecting a high error rate, intermittent data transfer, or an Out of Calibration multiplexing configuration error, meaning the module is failing to receive expected communication messages.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 7R Series
• 8R Series
• 8235R
• 8360R
• 9R Series
• 9RT Series
• 6145J
• 6165J
• 6180J
• 9650 STS
• 9750 STS
• 9670 STS
• 9770 STS
• CTS
• 540G-III
• 548G-III

1. 1

   Verify Active Codes: Recall, record, and clear the service codes to ensure 000639.13 is currently active and not a stored historical code.

2. 2

   Inspect CAN BUS Network: Check the CAN BUS wiring harness and connections routing to the XMC for any signs of physical damage, chafing, loose connections, or corrosion.

3. 3

   Verify Terminating Resistors: Ensure the terminating resistors at both ends of the CAN BUS network are functioning correctly. A missing or failed resistor causes signal interference and data corruption.

4. 4

   Check for Electrical Interference: Identify and mitigate any sources of electrical interference that may be affecting CAN BUS communication.

5. 5

   Check for Related Codes: Look for other active diagnostic trouble codes (DTCs) that might indicate which specific module is failing to transmit the lost messages.

1. 1

   Power Cycle

   Turn off the machine, cycle the key switch, and restart the engine to see if the module resets and recovers communication.

2. 2

   Wiring Repair

   If physical inspection reveals breaks or corrosion in the wiring harness connected to the XMC, repair or replace the damaged wiring.

3. 3

   Clean Connections

   Disconnect the XMC harness connectors, clean the pins with electrical contact cleaner, ensure they are tight, and reconnect them securely.

4. 4

   Replace Terminating Resistors

   If continuity tests show a failed CAN bus terminating resistor, replace it to restore proper network resistance.

5. 5

   Software Update

   Check if the XMC control software is out of date. Reprogram/update the XMC firmware to the latest version using John Deere Service Advisor.

6. 6

   Module Replacement & Calibration

   If the wiring is intact, resistors are good, and the module refuses to take a software update or communicate, the XMC module itself has failed internally. Replace the XMC Steering System Control Unit and perform the required steering sensor calibrations.