SSU 001807.04 – B138 Steering Wheel Position Sensor, Supply Voltage in Channel 1 Too Low

SSU 001807.04 (SSU 1807.04)

Code: 001807.04

Shortcode: 1807.04


This diagnostic trouble code (DTC), SSU 001807.04, is triggered when the power supply for the steering wheel position sensor SID 1 drops below 4.75 volts for longer than 320 milliseconds. This indicates a low voltage condition, potentially due to an open circuit.


When this error is detected, the steering system may not function correctly, potentially leading to inaccurate steering input and compromised vehicle control.


Inspect Power Supply:

  • Check the power supply to the steering wheel position sensor SID 1 for proper voltage regulation.
  • Ensure that the voltage does not drop below 4.75 volts.

Verify Sensor Connections:

  • Inspect the wiring and connectors related to the steering wheel position sensor SID 1 for signs of damage, loose connections, or corrosion.
  • Ensure all connections are secure and free from contaminants.

Check for Open Circuit:

  • Use diagnostic tools to check for continuity in the power supply circuit to ensure there are no open connections.

Update Software:

  • Ensure that the software related to the steering system is up-to-date. Apply any available firmware updates to improve system performance and compatibility.

Replace Faulty Components:

  • If the steering wheel position sensor SID 1 or related components are found to be defective, replace them with new, genuine parts.

Consult Technical Support:

  • If the error persists after performing the above steps, consult technical support or the manufacturer for further assistance.


  • Regular maintenance and inspection of the steering system components can help prevent low voltage conditions.
  • Ensuring the electrical system is properly regulated can avoid interruptions in sensor operation.

Control Units: John Deere

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