John Deere 001881.04 – HCU: Rear Hitch Draft Sensor Circuit Voltage Low
Issue description
The Hitch Control Unit (HCU or HCC) has detected that the signal voltage from the Rear Hitch Draft Sensor has dropped below the specified threshold of 0.20 volts. This indicates a low voltage condition in the circuit, pointing to a potential failure of the sensor itself, a wiring issue, or a fault within the control unit. When this fault is active, the system may revert to manual switch control for the hitch.
Applies to these machines
91 machines- 5225
- 5325
- 5425
- 5525
- 5625
- 6800
- 6810
- 6820
- 6830
- 6900
- 6910
- 6910S
- 6920
- 6920S
- 6930
- 6130R
- 6140R
- 6150R
- 6155R
- 6170R
- 6175R
- 6190R
- 6195R
- 6210R
- 6215R
- 6230R
- 6250R
- 7200
- 7210
- 7400
- 7410
- 7420
- 7510
- 7520
- 7600
- 7610
- 7700
- 7710
- 7720
- 7800
- 7810
- 7815
- 7820
- 7920
- 8100
- 8110
- 8120
- 8130
- 8200
- 8210
- 8220
- 8230
- 8300
- 8310
- 8320
- 8330
- 8400
- 8410
- 8420
- 8430
- 8520
- 8530
- 8560
- 8760
- 8960
- 9100
- 9120
- 9200
- 9220
- 9230
- 9300
- 9320
- 9330
- 9360R
- 9370R
- 9400
- 9410R
- 9420
- 9420R
- 9430
- 9460R
- 9470R
- 9510R
- 9520
- 9520R
- 9530
- 9560R
- 9570R
- 9620
- 9620R
- 9630
Check the cause
Inspect the wiring harness and connectors associated with the Rear Hitch Draft Sensor for damage, corrosion, loose connections, or chafing that could cause a short or open circuit.
Using a multimeter, measure the output voltage of the sensor. Normal operating range is 0.5 to 4.5 volts; a reading below 0.20 volts confirms a fault condition.
Clear the fault code and operate the hitch through its full range of motion to check for intermittent faults. If the code does not immediately return, continue operating to see if it can be recreated.
Repair steps
Prepare machine for service
Park the machine on a level surface, lower all equipment to the ground, stop the engine, and remove the key. Disconnect the battery ground strap before beginning any electrical work.
Access the sensor
Locate the draft sensor on the rear hitch assembly. Remove any covers or components necessary to gain access.
Replace the sensor
If diagnostic tests confirm the sensor is faulty, it must be replaced. Disconnect the electrical connector and remove the sensor from its mounting point. Install the new sensor.
Repair wiring
If the wiring is found to be damaged, repair or replace the affected section of the harness.
Reassemble and reconnect
Reassemble any removed covers or components and reconnect the battery ground strap.
Calibrate the hitch
Recalibrate the hitch control unit using a John Deere service tool or the specific procedures outlined in the service manual to ensure proper function.
Parts you might need
(9)- Hitch Draft SensorRE43738
Substitute for RE228737. Fits a very wide range of models, including many in the 6000, 7000, 8000, and 9000 series, such as the 8130, 8230, 8330, 8430, 8530, and 9230-9630 tractors.
Hitch Draft Sensor
RE228737Original part number, often substituted by RE43738. Fits older 4000 series and broad range of 7000-9000 series.
- Hitch Draft SensorRE322084
Fits newer 9R, 9RT, and 9RX series tractors.
- Hitch Draft SensorAL226252
OEM part noted for specific European/utility builds
Draft Sensor
56848OEM part for 5020, 6000, 7030, and 5R series
Hitch Draft Sensor
500760OEM part specifically for 6M Series tractors
- Hitch Draft SensorRE232426
OEM part for older legacy models like the 4555, 4755, 4955
Hitch Draft Sensor
RE51503OEM part for older legacy models like the 4555, 4755, 4955
- Rear Hitch Draft SensorRE237648
OEM John Deere part. Verify fitment by specific model and serial number.
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