John Deere 002035.09 – BLC / HV1 / ICU: CAN BUS Message Issue With Hitch Controller

This fault code indicates a communication breakdown on the vehicle's Controller Area Network (CAN bus). Specifically, the Hitch Valve Controller (HV1) or Main Control Module (BLC) is not receiving expected messages from the Hitch Control Computer (HCC). This internal message issue suggests a disruption in data communication between the hitch control modules, which can be caused by wiring problems, faulty control modules, or CAN bus network failures.

• 9230
• 9330
• 9430
• 9530
• 9630
• 9470RT
• 9520RT
• 9570RT
• 8235R
• 8260R
• 8285R
• 8310R
• 8335R
• 8360R
• 8310RT
• 8335RT
• 8360RT
• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6090MC
• 6090RC
• 6100MC
• 6100RC
• 6110MC
• 6110RC

1. 1

   Inspect the wiring harness and connectors associated with the Hitch Controller (HCC) and the logging control unit (HV1, ICU, or BLC) for chafed wires, loose or corroded connectors, and bent pins.

2. 2

   Check for the presence of other CAN bus-related fault codes that might indicate the location of the problem.

3. 3

   Verify power and ground supply to the Hitch Controller (HCC), specifically checking fuses F15 or F35 for the hitch control system.

4. 4

   Perform a CAN Bus Voltage Check with key on, engine off: CAN High (Yellow) to Ground should be 2.5V-3.5V; CAN Low (Green) to Ground should be 1.5V-2.5V.

5. 5

   Perform a CAN Bus Termination Resistor Check with key off, battery disconnected: Resistance between CAN High and CAN Low at a diagnostic connector should be approximately 60 Ohms (120 Ohms indicates an open circuit or missing resistor).

1. 1

   Repair wiring and connectors

   If any damaged wiring or connectors were found during the visual inspection, repair or replace them as necessary. Ensure all connections are clean and secure.

2. 2

   Address termination resistor issues

   If the CAN bus resistance check indicated 120 Ohms or abnormal resistance, locate and replace the faulty terminating resistor, typically located at the ends of the CAN bus harness.

3. 3

   Isolate the faulty module

   If wiring and resistors are good, disconnect other control modules from the CAN bus one at a time to see if communication with the hitch controller is restored, identifying any module disrupting the network.

4. 4

   Replace the Hitch Controller (HCC)

   If diagnostics point to a faulty Hitch Controller, replace the unit. Note that a calibration procedure may be necessary after replacement.

5. 5

   Clear fault codes and test

   Clear all fault codes using a diagnostic tool. Operate the machine and the hitch functions to ensure the fault code does not return.