U2973 – Lost Communication with the Steering Angle Sensor.

The ODBII code U2973 indicates a loss of communication with the steering angle sensor, which may affect the vehicle’s stability control and steering systems.

The severity of ODBII code U2973 is generally considered moderate to high.

Common Causes For: U2972 Vehicle Communication Bus Malfunction

• Faulty steering angle sensor
• Damaged wiring or connectors
• Poor electrical connections
• Malfunctioning vehicle control module
• Software issues or bugs
• Corrosion in connectors or terminals
• Interference from other electronic components
• Low battery voltage or power supply issues

Common misdiagnosis for U2973 Lost Communication with the Steering Angle Sensor.

• Faulty steering angle sensor
• Wiring issues or damaged connectors
• Faulty steering column module
• ABS module failure
• Power steering system issues
• Incorrectly calibrated steering angle sensor
• Faulty body control module (BCM)
• Software or firmware issues in the vehicle’s control modules

Common Troubleshooting Steps

When dealing with OBD-II code U2973, which indicates “Lost Communication with the Steering Angle Sensor,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes. Sometimes, related codes can provide more context for the issue.
• 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.
• **Connector Pins: Ensure that the pins in the connectors are not bent, corroded, or pushed back.
• Test the Steering Angle Sensor: **Sensor Functionality: If possible, test the steering angle sensor using a multimeter or scan tool to ensure it is functioning correctly. Check for proper voltage and resistance values as specified in the vehicle’s service manual.
• **Calibration: Some vehicles require the steering angle sensor to be calibrated after installation or repair. Check if calibration is necessary.
• Check Power and Ground: Verify that the steering angle sensor is receiving the correct voltage and has a good ground connection. Use a multimeter to measure voltage at the sensor connector.
• Inspect the CAN Bus: Since the steering angle sensor communicates over the CAN bus, check for issues with the CAN network. Look for:
• Open circuits or shorts in the CAN wiring.
• Other modules on the CAN bus that may be malfunctioning and affecting communication.
• Scan Tool Data: Use a scan tool to monitor live data from the steering angle sensor. Look for any irregularities in the readings when turning the steering wheel.
• Check for Software Updates: Sometimes, manufacturers release software updates that can resolve communication issues. Check if there are any updates available for the vehicle’s ECU.
• Inspect Related Components: Check other components that may be related to the steering system, such as the steering column, power steering pump, or electronic stability control (ESC) system, as issues in these areas can affect the steering angle sensor.
• Clear Codes and Test Drive: After performing the above checks and repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns.
• Consult Service Manual: If the issue persists, consult the vehicle’s service manual for specific diagnostic procedures related to the steering angle sensor and communication issues.1
• Professional Help: If you are unable to resolve the issue after these steps, consider seeking help from a professional mechanic or dealership, as they may have specialized tools and knowledge for diagnosing complex issues. By following these steps, you should be able to identify the cause of the U2973 code and take appropriate action to resolve it.