John Deere 520531.12 – Front Chassis Module (SCO): Loader Bucket Position Sensor Issue

This sensor monitors the angle and position of the front loader bucket, which is critical for the tractor's Return-to-Position (RTP) function and overall electro-hydraulic loader control.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R

1. 1

   Check for related active codes like 520531.13 or 520531.14, which indicate a calibration is needed rather than a complete failure.

2. 2

   Inspect the bucket position sensor wiring harness on the loader frame for physical damage, chafing, or pinched wires.

3. 3

   Disconnect the sensor and check the connector pins for moisture, dirt, or corrosion.

1. 1

   Locate the Sensor

   Find the bucket position sensor mounted on the front loader boom/bucket linkage.

2. 2

   Disconnect and Remove

   Unplug the sensor from the main wiring harness. Unbolt the sensor from its mounting bracket.

3. 3

   Replace Components

   If the wiring harness is damaged, replace it. Otherwise, install the new inductive position sensor into the mounting bracket.

4. 4

   Reconnect

   Plug the sensor back into the harness, ensuring the connector clicks and locks to prevent moisture intrusion.

5. 5

   Calibrate

   You must perform a 'Front Loader Bucket Position Sensor Calibration' after replacing the sensor. This is done through the tractor's cab display (RTP - Return-to-Position page) so the SCO module can learn the new sensor's minimum and maximum voltage sweeps.