John Deere 523832.04 – Hitch Control Unit (HCU): Rear Hitch Rate-of-Drop Sensor Circuit Voltage Low

The voltage signal returning from the rear hitch rate-of-drop potentiometer has dropped below the acceptable threshold. This is typically caused by a short to ground, an open circuit in the 5V reference wire, an open signal wire, or a failed potentiometer.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 5090M
• 5100M
• 5100MH
• 5100ML
• 5115M
• 5065M
• 5075M
• 5085M
• 5115ML
• 5095M
• 5095MH
• 5105M
• 5015ML
• 5225
• 5325
• 5425
• 5525
• 5625
• 5725
• 6090MC
• 6100MC
• 6110MC
• 6090RC
• 6100RC
• 6110RC

1. 1

   Inspect the wiring harness between the HCU/HCC and the rate-of-drop dial on the right-hand console/armrest for chafed wires, pinched harnesses, or loose connector pins.

2. 2

   Disconnect the sensor, turn the key to the ON position, and verify that the sensor connector is receiving a 5V reference signal and has a solid ground.

3. 3

   Check the signal wire from the sensor connector back to the HCU for continuity and ensure it is not shorted to ground.

4. 4

   Test the potentiometer itself by measuring its resistance sweep with a multimeter. The resistance should change smoothly without any dead spots as you turn the dial.

1. 1

   Turn off the tractor, remove the key, and disconnect the negative battery cable to prevent electrical spikes.

   Turn off the tractor, remove the key, and disconnect the negative battery cable to prevent electrical spikes.

2. 2

   Access the right-hand control console or armrest control assembly where the hitch command dials are located.

   Access the right-hand control console or armrest control assembly where the hitch command dials are located.

3. 3

   Carefully remove the trim panels to expose the back of the hitch control dials.

   Carefully remove the trim panels to expose the back of the hitch control dials.

4. 4

   Disconnect the electrical connector from the Rate-of-Drop sensor/potentiometer.

   Disconnect the electrical connector from the Rate-of-Drop sensor/potentiometer.

5. 5

   Remove the retaining nut or mounting screws holding the potentiometer in place and remove the faulty sensor.

   Remove the retaining nut or mounting screws holding the potentiometer in place and remove the faulty sensor. (Note: On some models, the rate-of-drop, raise-limit, and load/depth sensors are serviced together as a kit or require removing the engine speed control assembly simultaneously).

6. 6

   Install the new potentiometer and secure it in the console.

   Install the new potentiometer and secure it in the console.

7. 7

   Reconnect the electrical harness and reassemble the console trim.

   Reconnect the electrical harness and reassemble the console trim.

8. 8

   Reconnect the battery.

   Reconnect the battery.

9. 9

   Clear the stored fault codes.

   Clear the stored fault codes.

10. 10

    Perform an HCU calibration procedure via the tractor's diagnostic monitor.

    You will likely need to perform an HCU calibration procedure via the tractor's diagnostic monitor. If the system is not calibrated, it may throw a related code (523832.13 - HCU Calibration Fault / Out of Range).