John Deere 521475.09 – HCC: Rear Hitch Load Depth Encoder Increase Message Missing

A communication-related issue logged by the HCC indicating the rear hitch load depth encoder increase message is missing.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 9470RT
• 9520RT
• 9570RT
• 8245R
• 8270R
• 8295R
• 8320R
• 8345R
• 8370R
• 8400R

1. 1

   Power cycle the key switch and tractor power to see if the communication glitch clears on its own

2. 2

   Verify the tractor's system voltage, as low supply voltage to the rear control unit can cause communication dropouts

3. 3

   Inspect the wiring harness and connectors between the Rear Hitch Load Depth Encoder and the HCC module for incompatible locations, wire connector faults, corrosion, or physical damage

4. 4

   Check for companion codes (such as HCC 521475.19 or HCC 521475.31) that might indicate a hard failure of the sensor rather than just a wiring issue

1. 1

   Safely Park and Power Down

   Turn off the engine, reduce electrical loads, and disconnect battery power if probing the harness.

2. 2

   Inspect Fuses

   Check the fuses supplying power to the HCC and rear hitch components.

3. 3

   Test Continuity

   Disconnect the harness at the Load Depth Encoder and at the HCC. Use a multimeter to test for continuity, shorts to ground, or shorts to power on the signal/communication lines.

4. 4

   Clean and Reconnect

   If no wiring damage is found, clean the connector pins with contact cleaner, apply dielectric grease, and reconnect securely.

5. 5

   Replace the Encoder

   If the wiring is intact but the 'Message Missing' code persists (or is accompanied by data faults), the encoder's internal communication circuitry has likely failed. Replace the Rear Hitch Load Depth Encoder.

6. 6

   Recalibrate

   After replacing hitch sensors or encoders, perform a Rear Hitch Calibration procedure via the CommandCenter display to prevent calibration codes (e.g., HCC 523950.13).