U2851 – Lost Communication with the Steering Angle Sensor.

The ODBII code U2851 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 U2851 is generally considered moderate.

Common Causes For: U2850 U2850: Control Module Communication Bus Fault

• 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 U2851 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 the OBD-II code U2851, 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 Additional Codes: Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other issues present.
• 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 the output voltage or resistance 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 ground. Use a multimeter to check for power at the sensor connector.
• If there is no power or ground, trace the wiring back to the source to identify any breaks or shorts.
• Inspect the CAN Bus System: Since the steering angle sensor communicates over the CAN bus, check for issues in the CAN bus wiring. Look for shorts, opens, or interference in the communication lines.
• Use a scan tool to monitor the CAN bus for any irregularities or communication issues.
• 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 Technical Service Bulletins (TSBs): Look for any TSBs related to the steering angle sensor or communication issues for your specific vehicle make and model. Manufacturers may have specific fixes or recommendations.
• Professional Diagnosis: If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized tools and knowledge to diagnose more complex issues.Conclusion By following these troubleshooting steps, you can systematically identify and resolve the issue related to the U2851 code. Always refer to the vehicle’s service manual for specific procedures and specifications related to your vehicle.