John Deere 520255.19 – HV1: Internal CAN BUS Message Missing From The HCC Software. (HV1)

This indicates a communication failure on the tractor's Controller Area Network (CAN BUS). Specifically, the control unit responsible for the hitch valve is failing to receive required operational messages or data packets from the rear chassis software within the allotted time.

• 5090M
• 5100M
• 5100MH
• 5100ML
• 5115M
• 5115ML

1. 1

   Cycle the key switch to perform a power cycle on the Hitch Valve Control Unit to resolve temporary software execution or handshake issues

2. 2

   Verify the switched supply voltage to the HV1 is stable between 9.0V and 16.0V (undervoltage or overvoltage can cause the module to drop off the CAN BUS)

3. 3

   Inspect the CAN BUS communication lines between the HCC (Rear Chassis Module) and the HV1 for chafed wires, loose connector pins, or corrosion

4. 4

   Check if there are any available software updates for the HV1 or HCC modules

5. 5

   Use a PC-based diagnostic tool to read the ECU failure memory, check live sensor values, and verify if the HCC is broadcasting on the network

1. 1

   Reset the System

   Turn the tractor off, wait for the modules to power down completely, and turn the key switch back on to see if the code clears.

2. 2

   Update Software

   If the code returns, connect your diagnostic tool and flash the HV1 and HCC modules with the latest OEM software updates to patch any known CAN BUS timeout bugs.

3. 3

   Repair Wiring

   If the software is up to date, use a multimeter to test the CAN High and CAN Low lines between the HCC and HV1. Repair or replace any damaged sections of the wiring harness or connectors.

4. 4

   Replace Faulty Module

   If the wiring is intact, power/ground are verified, and the software is current, the communication failure is likely due to a hardware fault inside one of the modules. Replace the HV1 (or HCC if it is failing to broadcast to other modules as well).

5. 5

   Calibrate

   After replacing the HV1, perform a full calibration of the rear hitch stepper motor and hitch position sensors using the diagnostic tool.