John Deere 001881.03 – HCU: Left Draft Pin Sensor Signal Voltage High

The Hitch Control Unit (HCU/HCC) has detected a signal voltage from the left draft pin sensor that is above the expected range. The draft sensors measure the pulling force on the lower lift arms to allow for automatic adjustments of the implement depth and load. A high voltage reading typically suggests an open circuit, a short to a power source, or a malfunctioning sensor. In a non-loaded state, the sensor's output voltage should be around 5V. When this fault is active, the tractor's automatic draft control may be disabled, though manual control of the hitch via switches may still be possible.

• 6130R
• 6135M
• 6140J
• 6140R
• 6145R
• 6150J
• 6150M
• 6150R
• 6155J
• 6155M
• 6155R
• 6165J
• 6170M
• 6170R
• 6175M
• 6175R
• 6180J
• 6190R
• 6195M
• 6195R
• 6205J
• 6210J
• 6210M
• 6210R
• 6215R
• 6230R
• 6250R
• 6800
• 6810
• 6820
• 6830
• 6900
• 6910
• 6920
• 6930
• 7220
• 7320
• 7330
• 7420
• 7425
• 7430E
• 7500
• 7505
• 7515
• 7520
• 7525
• 7530E
• 7720
• 7810
• 7815
• 7820
• 7920
• 8120
• 8130
• 8220
• 8230
• 8230T
• 8320
• 8330
• 8330T
• 8420
• 8430
• 8430T
• 8520
• 8530
• 8560
• 8760
• 8960
• 9230
• 9330
• 9430
• 9430T
• 9530
• 9530T
• 9630
• 9630T
• 8310RT
• 8335RT
• 8360RT
• 9470RT
• 9520RT
• 9570RT

1. 1

   Visually inspect the wiring harness leading to the left draft pin sensor for chafing, breaks, or pinched wires, and check connectors for corrosion, dirt, or loose pins

2. 2

   Attempt to clear the fault code from the control unit by cycling the tractor's power and operating the hitch to see if the code immediately returns

3. 3

   With the hitch unloaded, check the diagnostic address for the draft sensor voltage on the tractor's display; a reading significantly higher than the expected 5V confirms the high voltage condition

4. 4

   Test the sensor resistance using a multimeter across the sensor's terminals to check for an open circuit (infinite resistance) or a dead short (zero resistance)

1. 1

   Park safely

   Park the tractor on a level surface, lower all equipment to the ground, stop the engine, remove the key, and disconnect the battery ground strap.

2. 2

   Repair wiring

   If any damage is found in the wiring harness during the diagnostic checks, repair or replace the affected sections and ensure all connections are clean and secure.

3. 3

   Replace the sensor

   If diagnostic checks point to a faulty sensor, replace the draft sensor pin located in the lower lift arm assembly.

4. 4

   Calibrate the hitch system

   After replacing the sensor or repairing wiring, recalibrate the hitch control system. Ensure hydraulic oil is above 50°C (122°F), add 136-226 kg (300-500 lbs) of weight to the hitch lift arms, access the hitch calibration menu on the display, and follow on-screen prompts to cycle the hitch and save new values.