U2646 – Lost Communication with the Steering Angle Sensor.

The ODBII code U2646 indicates a loss of communication with the steering angle sensor, which may affect the vehicle’s stability control and steering functions.

The severity of ODBII code U2646 is moderate.

Common Causes For: U2645 Invalid Data Received from Vehicle Dynamics Control Module.

• Faulty steering angle sensor
• Damaged wiring or connectors
• Poor electrical connections
• Malfunctioning power supply to the sensor
• Software issues or calibration errors
• Faulty vehicle control module (VCM)
• Interference from other electronic components

Common misdiagnosis for U2646 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 ABS Module
• Issues with the Vehicle’s CAN Bus System
• Battery or Power Supply Problems

Common Troubleshooting Steps

When dealing with OBD-II code U2646, 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 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 System: Since the steering angle sensor communicates over the CAN bus, check for issues in the CAN bus wiring. Look for shorts, opens, or other faults in the wiring that could affect communication.
• Use a scan tool to monitor the CAN bus for any irregularities.
• Check for Interference: Ensure that there are no aftermarket devices or modifications that could interfere with the communication between the steering angle sensor and the vehicle’s control modules.
• Clear Codes and Test Drive: After performing inspections 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.
• Replace the Steering Angle Sensor: If all other troubleshooting steps fail and the sensor is confirmed to be faulty, consider replacing the steering angle sensor.
• Consult Technical Service Bulletins (TSBs): Check for any TSBs related to the steering angle sensor for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes.
• Seek Professional Help: If you are unable to resolve the issue after following these steps, it may be best to consult a professional mechanic or technician who has experience with your vehicle’s systems. By following these steps, you should be able to identify and address the cause of the U2646 code effectively.