John Deere 001807.05 – SSU: Steering Wheel Position Sensor 1 Circuit Current Low

The Steering System Unit (SSU) has detected that the electrical current in the circuit for the primary steering wheel position sensor is below the normal operating range (likely less than 4 mA). This condition triggers a 'Repair as soon as possible' warning and indicates a critical issue with the steering system that can disable or severely affect the AutoTrac™ system.

• 7720
• 7820
• 7920
• 8230T
• 8330T
• 8430T
• 9230
• 9330
• 9430
• 9430 Scraper
• 9520T
• 9530
• 9530 Scraper
• 9630
• 9630 Scraper
• 7R Series
• 8R Series
• 9R Series

1. 1

   Restart the vehicle to see if the code clears, which may indicate a temporary communication issue

2. 2

   Inspect fuse F23 (SSU unswitched power supply), as well as fuses F6 (for IVT) or F35 (for PowrQuad Plus) for SSU communication

3. 3

   Visually inspect the wiring harness and connectors between the steering wheel position sensor and the SSU for damage, corrosion, or loose connections

4. 4

   Wiggle the harness while monitoring to check for intermittent sensor reading changes

5. 5

   Inspect the area around the batteries and alternator for physical damage or debris affecting the electrical system

6. 6

   Perform a load test on the individual wires of the sensor circuit to check for excessive voltage drop indicating high resistance

1. 1

   Isolate the fault

   Based on diagnostic checks, determine if the root cause is the wiring, connectors, or the sensor itself.

2. 2

   Repair wiring

   If high resistance or physical damage is found in the harness, repair or replace the affected section.

3. 3

   Replace the sensor

   If the sensor is determined to be faulty, replace the steering wheel position sensor located in the steering column.

4. 4

   Center and calibrate sensor

   For certain assemblies (e.g., RE69108), access SSU address 005 and turn the sensor shaft to achieve a reading of 2.5 volts (+/- 0.3 volts) before installation. After installation, perform an AutoTrac calibration by turning the steering wheel to its stops and following on-screen prompts.