SSU 522451.01 – B139 Steering Angle Sensor, Voltage in Channel 2 Too Low

SSU 522451.01 (SSU )

Code: 522451.01



This diagnostic trouble code (DTC), SSU 522451.01, is triggered when the voltage at the signal line of channel 2 of the wheel angle sensor (WAS) falls below 0.25 volts for longer than 320 milliseconds. This indicates a low voltage condition, potentially due to an open circuit in channel 2 of the wheel angle sensor.


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


Inspect Power Supply:

  • Check the power supply to channel 2 of the wheel angle sensor (WAS) for proper voltage regulation.
  • Ensure that the voltage does not fall below 0.25 volts.

Verify Sensor Connections:

  • Inspect the wiring and connectors related to channel 2 of the wheel angle sensor 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 wheel angle sensor or related components in channel 2 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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