U2979 – Lost Communication with the Steering Angle Sensor.

The ODBII code U2979 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 U2979 is generally considered moderate.

Common Causes For: U2978 U2978: “Vehicle Communication Bus Malfunction”

• Faulty steering angle sensor
• Damaged wiring or connectors
• Poor electrical connections
• Malfunctioning vehicle control module
• Software issues or updates needed
• Corrosion or dirt in connectors
• Power supply issues to the sensor
• Faulty CAN bus communication

Common misdiagnosis for U2979 Lost Communication with the Steering Angle Sensor.

• Faulty Steering Angle Sensor
• Wiring Issues or Short Circuits
• Faulty Clock Spring
• Malfunctioning ABS Module
• Power Steering Control Module Issues
• Incorrectly Calibrated Steering Angle Sensor
• Faulty Body Control Module (BCM)
• Issues with the Vehicle’s CAN Bus System

Common Troubleshooting Steps

When dealing with the OBD-II code U2979, 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 damaged.
• 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 by the manufacturer.
• **Calibration: Some vehicles require the steering angle sensor to be calibrated after installation or repair. Refer to the vehicle’s service manual for calibration procedures.
• Check Power and Ground: Verify that the steering angle sensor is receiving the correct voltage and that the ground connection is solid. Use a multimeter to check for power at the sensor connector.
• Inspect the CAN Bus: Since the steering angle sensor communicates over the CAN (Controller Area Network) bus, check for any issues with the CAN wiring. Look for shorts, opens, or other faults in the wiring.
• Use a scan tool to monitor the CAN bus for any communication issues or errors.
• 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.
• 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.
• 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.
• Professional Diagnosis: If you are unable to resolve the issue after these steps, it may be necessary to seek assistance from a professional mechanic or dealership, as they may have specialized tools and knowledge to diagnose complex issues. By following these steps, you should be able to identify and potentially resolve the issue related to the U2979 code.