John Deere 520531.17 – Front Chassis Module (SCO): Loader Bucket Position Sensor Issue

The system has detected an irregularity, logic error, or invalid reading coming from the sensor responsible for monitoring the tilt/position of the front loader bucket.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6R Series Tractors (2015-2021)

1. 1

   Inspect the sensor wiring for an "Open or Short to Ground" or "Short to Power". Check the input voltages to ensure they are not reading excessively high or low.

2. 2

   Inspect the Bucket Position Sensor Harness for physical damage, rubbing, or corrosion at the connectors.

3. 3

   Check if the sensor has lost its calibration parameters, as related code 520531.13 specifically flags a "Front Loader Bucket Position Sensor Calibration" issue.

1. 1

2. 2

   Access the sensor

   Locate the Loader Bucket Position Sensor (often designated as sensor B75 in JD schematics) on the front loader linkage.

3. 3

   Inspect and replace wiring (if necessary)

   Disconnect the sensor harness. If the wiring is damaged or shorted, replace the sensor harness.

4. 4

   Replace the sensor

   If the wiring is intact but the sensor has an internal logic error or fails voltage tests, unbolt the faulty bucket position sensor and install the replacement unit.

5. 5

   Perform calibration

   After replacing the sensor or harness, you must perform a Front Loader Bucket Position Sensor Calibration via the tractor's diagnostic monitor to clear the code and restore proper loader functionality.