U2078 – Lost Communication with the Steering Angle Sensor Module.

The ODBII code U2078 indicates that there is a loss of communication between the vehicle’s control module and the steering angle sensor module, which may affect the vehicle’s stability control and steering functions.

The severity of ODBII code U2078 is moderate.

Common Causes For: U2077 Control Module Communication Bus Off.

• 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 U2078 Lost Communication with the Steering Angle Sensor Module.

• Faulty Steering Angle Sensor
• Wiring or connector issues
• Faulty Body Control Module (BCM)
• Faulty Electronic Power Steering (EPS) module
• Incorrectly calibrated steering angle sensor
• Faulty ABS module
• Software issues or updates needed
• Battery or power supply problems

Common Troubleshooting Steps

When dealing with the OBD-II code U2078, which indicates “Lost Communication with the Steering Angle Sensor Module,” 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 leading to the steering angle sensor. Look for 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 signal as per the manufacturer’s specifications.
• **Calibration: Some vehicles may 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: **Power Supply: Verify that the steering angle sensor is receiving the correct voltage. Use a multimeter to check the power supply at the sensor connector.
• **Ground Connection: Ensure that the ground connection for the sensor is intact and has a good connection.
• Inspect the CAN Bus System: **Communication Lines: Since the steering angle sensor communicates over the CAN bus, check for any issues with the CAN wiring. Look for shorts, opens, or damaged wires.
• **Other Modules: Ensure that other modules on the CAN bus are functioning correctly, as a fault in another module can affect communication.
• Check for Software Updates: **ECU Updates: Check if there are any software updates available for the vehicle’s ECU or the steering angle sensor module. Sometimes, manufacturers release updates to fix communication issues.
• 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 complex communication issues. By following these steps, you should be able to identify and resolve the issue related to the U2078 code. Always refer to the vehicle’s service manual for specific procedures and specifications.