John Deere 523842.03 – Hitch Control Unit (HCU) or Hitch Control Controller (HCC): Rear Hitch Load/Depth Sensor Circuit Voltage High

The control unit is receiving a voltage signal from the rear hitch load/depth sensor (or the draft control dial/sensitivity potentiometer) that exceeds the normal operating range (typically above 4.5 volts). This usually points to a short to power in the sensor circuit, an open ground circuit, or a failed sensor/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 and connectors between the rear hitch load/depth sensor (or draft control dial) and the HCU/HCC for chafing, pinched wires, or corrosion.

2. 2

   Using a multimeter, check the signal voltage at the sensor. If it is reading above 4.5 volts, check the sensor's ground circuit for an open condition.

3. 3

   Disconnect the sensor and the HCU/HCC. Check for a short to power on the signal wire.

4. 4

   If the wiring harness (reference voltage, signal, and ground) tests good, the internal potentiometer of the load/depth sensor or draft dial has likely failed.

1. 1

   Power Down

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

2. 2

   Locate the Component

   Depending on the exact model, locate either the draft control dial/potentiometer (usually in the right-hand console) or the rear hitch load/depth sensor (typically mounted near the rockshaft/rear hitch assembly).

3. 3

   Disconnect and Replace

   Unplug the electrical connector from the faulty sensor/potentiometer. Remove the mounting hardware and remove the component.

4. 4

   Install New Part

   Install the replacement sensor or potentiometer and secure the mounting hardware. Reconnect the electrical harness, ensuring the connector clicks into place and is free of debris.

5. 5

   Reassemble and Power Up

   Reconnect the battery.

6. 6

   Calibration

   Turn the key on and clear the stored fault codes. Note: Replacing hitch control sensors or the HCU usually requires performing a Rear Hitch Calibration procedure via the tractor's diagnostic monitor or John Deere Service ADVISOR software to relearn the sensor's minimum and maximum voltage sweeps.