John Deere HCU524212.31 – HCU: Rear Hitch Control Lever Communication Fault

The Hitch Control Unit (HCU) is not receiving the expected command signal from the rear lift lever. This indicates a CAN BUS message error or lost communication between the physical hitch control lever operated by the driver and the electronic control module. When this fault is active, the rear hitch system may not engage or may have limited functionality.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 7720
• 7820
• 7920
• 9000 Series
• 9230
• 9330
• 9430
• 9530
• 9630

1. 1

   Check the area around the batteries and alternator for any signs of damage, corrosion, or loose connections

2. 2

   Inspect fuses related to the hitch control system, specifically fuse F30 for the HCU power supply

3. 3

   Ensure the hitch control lever is not stuck or obstructed

4. 4

   Cycle the hitch control lever through its full range of motion (raise, lower, and float positions) to see if any response can be elicited

5. 5

   Restart the tractor to perform a key cycle, which may reset the control unit if the communication fault is temporary

6. 6

   Check the hydraulic oil level, as low fluid can trigger related HCU faults

1. 1

   Perform preliminary checks

   Complete the visual, fuse, and operator control checks. If the fault persists after a key cycle, dealer-level diagnostics are required.

2. 2

   Read live data (Dealer Level)

   Use John Deere Service ADVISOR software to read live data from the hitch control lever sensor and verify if a valid signal is being transmitted to the HCU.

3. 3

   Test wiring harness (Dealer Level)

   Perform continuity and voltage checks on the wiring harness connecting the rear hitch control lever to the HCU to rule out electrical shorts or breaks.

4. 4

   Replace faulty component and calibrate (Dealer Level)

   Replace the identified faulty component (control lever assembly, wiring harness, or HCU). After replacement, perform a hitch system calibration using Service ADVISOR.