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U code network High severity

U0126 Lost Communication With Steering Angle Sensor Module

The OBD2 code U0126 indicates that there is a loss of communication between the vehicle's control module and the steering angle sensor module, which can affect the vehicle's stability control and steering systems

Definition

The OBD2 code U0126 indicates that there is a loss of communication between the vehicle's control module and the steering angle sensor module, which can affect the vehicle's stability control and steering systems

Common causes

  • Faulty steering angle sensor
  • Damaged wiring or connectors
  • Poor electrical connections
  • Malfunctioning vehicle control module
  • Software issues or bugs
  • Corroded terminals
  • Interference from aftermarket devices
  • Low battery voltage or power supply issues

Common misdiagnoses

  • Faulty steering angle sensor
  • Wiring issues or damaged connectors
  • Faulty ABS module
  • Faulty power steering control module
  • Incorrectly calibrated steering angle sensor
  • Software or firmware issues in the vehicle's control modules
  • Battery or charging system problems
  • Faulty body control module (BCM)

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Sometimes, multiple codes can provide more context about the issue

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with the steering angle sensor for any signs of damage, corrosion, or loose connections

  3. 3. Connector Pins

    Ensure that the pins in the connectors are not bent, corroded, or damaged

  4. 4. Test the Steering Angle Sensor

    Sensor Functionality: If possible, test the steering angle sensor to ensure it is functioning correctly. This may involve using a multimeter or an oscilloscope to check the output signals

  5. 5. Calibration

    Some vehicles require the steering angle sensor to be calibrated after installation or repair. Check the vehicle’s service manual for calibration procedures

  6. 6. Check the CAN Bus Communication

    Network Integrity: Since the steering angle sensor communicates over the CAN bus, check the integrity of the CAN bus wiring. Look for shorts, opens, or high resistance in the wiring

  7. 7. Scan Other Modules

    Use a scan tool to check if other modules on the CAN bus are communicating properly. If other modules are also having communication issues, it may indicate a problem with the bus itself

  8. 8. Inspect the Power and Ground Supply

    Power Supply: Verify that the steering angle sensor is receiving the correct voltage. Check the vehicle’s wiring diagrams for the correct voltage specifications

  9. 9. Ground Connections

    Ensure that the ground connections for the steering angle sensor are secure and free of corrosion

  10. 10. Check for Software Updates

    ECU Updates: Sometimes, manufacturers release software updates for the vehicle’s ECU that can resolve communication issues. Check with the manufacturer or a dealership for any available updates

  11. 11. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  12. 12. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the steering angle sensor or communication issues for your specific vehicle make and model. These can provide valuable insights and solutions

  13. 13. Professional Diagnosis

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle’s specific systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the U0126 code. Always refer to the vehicle’s service manual for specific procedures and specifications