U2649 – Lost Communication with the Steering Angle Sensor.

The ODBII code U2649 indicates a loss of communication between the vehicle’s control module and the steering angle sensor, which may affect the vehicle’s stability control and steering functions.

The severity of ODBII code U2649 is moderate.

Common Causes For: U2648 Vehicle Communication Bus Malfunction

• Faulty steering angle sensor
• Damaged wiring or connectors
• Poor electrical connections
• Malfunctioning power steering control module
• Software issues or calibration errors
• Low battery voltage or electrical system issues
• Interference from aftermarket devices or modifications

Common misdiagnosis for U2649 Lost Communication with the Steering Angle Sensor.

• Faulty Steering Angle Sensor
• Wiring Issues or Short Circuits
• Faulty Body Control Module (BCM)
• Faulty Electronic Power Steering (EPS) Module
• Incorrectly Calibrated Steering Angle Sensor
• Faulty Instrument Cluster
• Issues with the Vehicle’s CAN Bus System
• Battery or Grounding Problems

Common Troubleshooting Steps

When dealing with OBD-II code U2649, 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 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: **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 providing a good ground.
• Inspect the CAN Bus: **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 interference in the communication lines.
• **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 that may address communication issues with the steering angle sensor.
• 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, refer to the vehicle’s service manual for specific diagnostic procedures related to the steering angle sensor and its communication.
• Professional Diagnosis: 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 further diagnosis. By following these steps, you should be able to identify and potentially resolve the issue related to the U2649 code.