John Deere 1807.21 – XSC: Steering Wheel Position Sensor Channel 1, Malfunction (or Duty Cycle Low)

This error code is generated when the duty cycle at channel 1 of the steering wheel position sensor falls below 1%, indicating a potential malfunction of the sensor itself or an issue with its signal processing. The control software will exhibit limited or no functionality, which directly impacts the accuracy and responsiveness of the machine's steering system.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6145J
• 6165J
• 6180J
• 6205J
• 8245R
• 8400R
• 5075M
• 5090M
• 5100M
• 5115M
• 7180
• 7280
• 7380
• 7480
• 7580
• 7780
• 7980
• 8230
• 8260R
• 8320R
• 8100T
• 8200T
• 8300T
• 8400T
• 8320RT
• 8345RT
• 9470RT

1. 1

   Inspect the steering wheel position sensor for physical signs of damage or wear, and ensure it is securely connected to the wiring harness.

2. 2

   Inspect the wiring harness for open circuits, shorts to ground, or corroded connector pins that could cause signal loss (duty cycle below 1%).

3. 3

   Use a John Deere diagnostic tool (like Service ADVISOR) to monitor sensor output. Verify if live data correctly corresponds to steering commands.

4. 4

   Inspect the steering control valves for proper operation to ensure they are receiving commands correctly and are free of blockages.

5. 5

   Check for and install any available updates for the XSC control software, as this can sometimes address signal processing bugs.

1. 1

   Power Down

   Turn off the machine and disconnect the battery to prevent electrical shorts during repair.

2. 2

   Access the Sensor

   Locate the steering wheel position sensor, typically mounted on the steering column assembly.

3. 3

   Disconnect

   Carefully unplug the electrical harness connector from the sensor.

4. 4

   Remove

   Unbolt the mounting hardware securing the sensor and remove the faulty unit.

5. 5

   Install

   Mount the new OEM steering wheel position sensor and secure it with the retaining hardware.

6. 6

   Reconnect

   Plug the electrical harness back into the new sensor, ensuring the connector clicks and locks into place.

7. 7

   Reassemble and Power Up

   Reconnect the battery.

8. 8

   Calibrate and Clear Codes

   Connect the John Deere diagnostic tool, clear the active XSC 001807.21 fault code, and perform a steering angle sensor calibration procedure so the XSC module learns the new sensor's center position.

9. 9

   Test

   Test drive the machine to ensure full steering functionality is restored and the code does not return.