John Deere 001865.19 – CCU: CAN BUS Message From Hitch Module Not Available

The system has detected a loss of communication with the hitch control module. Expected messages from the hitch module on the Controller Area Network (CAN bus) are not being received by the Central Control Unit (CCU) or other control units. This communication disruption typically leads to a loss of hitch functions.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 7R Series
• 8R Series
• 9R Series

1. 1

   Cycle the key switch to see if the fault clears, which may indicate a temporary communication glitch

2. 2

   Check for other active fault codes, especially those related to power supply or other modules, which could indicate a broader electrical issue

3. 3

   Visually inspect wiring harnesses and connectors at the hitch control module and CCU for chafing, corrosion, or loose connections

4. 4

   Verify power and ground to the hitch module to ensure it is receiving correct voltage and has a solid ground connection

5. 5

   With the battery disconnected, check CAN bus integrity by measuring resistance between CAN high and CAN low at the diagnostic connector (should be approximately 60 ohms; 120 ohms indicates a missing or faulty terminating resistor)

6. 6

   With the system powered on, perform a CAN bus voltage check (CAN high and low should rest at approximately 2.5V, with high increasing by 1V and low decreasing by 1V during communication)

7. 7

   Check for high bus utilization using John Deere Service Advisor or a similar diagnostic tool

1. 1

   Repair basic electrical issues

   If diagnostic checks revealed issues with power, ground, or damaged wiring, repair or replace affected harness sections, clean corroded terminals, and secure loose connections.

2. 2

   Inspect and replace terminating resistors

   If the CAN bus resistance reading was incorrect (e.g., 120 ohms), inspect the active and passive terminators. Swap them for diagnostic purposes and replace any faulty terminating resistor.

3. 3

   Isolate faulty modules on the network

   If wiring and terminators are good, disconnect other control modules on the same CAN bus one at a time to see if communication with the hitch module is restored, indicating interference from another module.

4. 4

   Replace hitch control module

   If all other diagnostic steps fail, replace the hitch control module. Note that the new module may require calibration or programming with John Deere service tools.