John Deere 1877.31 – BLC (Basic Load Center): Hitch Control Fault

Secondary or informational fault indicating an operational failure in the rear hitch system, likely disabling the hitch for safety. The root cause is tied to a different, specific component failure (such as a position sensor, draft sensor, or hitch valve).

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6090MC
• 6100MC
• 6110MC
• 6090RC
• 6100RC
• 6110RC
• 6105M
• 6115M
• 6125M
• 6135M
• 6140M
• 6150M
• 6170M

1. 1

   Check for Primary Codes: Connect a diagnostic tool (like John Deere Service ADVISOR or Jaltest) and pull all active/stored codes in the BLC and HCC (Hitch Control) modules. Address any specific sensor or solenoid codes first.

2. 2

   Visual Inspection: Inspect the wiring harnesses and connectors going to the rear hitch position sensor (rockshaft sensor) and the draft pins/sensors. Look for pinched wires, corrosion, or moisture intrusion.

3. 3

   Live Data Monitoring: Use the diagnostic tool to monitor the live voltage/values of the hitch position sensor and draft sensors while manually attempting to raise/lower the hitch. Look for erratic jumps or dead spots in the sensor readings.

4. 4

   Valve Check: Verify that the hitch control valve solenoids are receiving voltage and have proper ground.

1. 1

   Power Down

   Turn off the tractor and disconnect the negative battery cable.

2. 2

   Locate the Component

   Locate the faulty component identified by the primary error code (e.g., the hitch position sensor located on the rear rockshaft).

3. 3

   Removal

   Disconnect the electrical harness connector from the sensor. Remove the retaining bolts/screws and carefully extract the sensor from the housing.

4. 4

   Installation

   Install the new sensor, ensuring any O-rings or seals are properly seated. Tighten the retaining hardware and reconnect the electrical harness.

5. 5

   Calibration

   Reconnect the battery. Turn the key to the ON position. You must perform a rear hitch calibration using the diagnostic tool or the tractor's onboard command center so the BLC can learn the new sensor's minimum and maximum travel limits.

6. 6

   Clear Codes

   Clear the BLC 001877.31 code and any primary codes.

7. 7

   Test

   Start the tractor and cycle the rear hitch through its full range of motion to verify proper operation.