U2643 – Lost Communication with the Steering Angle Sensor.

The ODBII code U2643 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 U2643 is moderate.

Common Causes For: U2642 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) or electronic control unit (ECU)

Common misdiagnosis for U2643 Lost Communication with the Steering Angle Sensor.

• Faulty steering angle sensor
• Wiring issues or damaged connectors
• Faulty steering column module
• Malfunctioning ABS module
• Incorrectly calibrated steering angle sensor
• Power supply issues
• Faulty electronic control unit (ECU)

Common Troubleshooting Steps

When dealing with OBD-II code U2643, 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 affecting the steering angle sensor.
• 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 an oscilloscope to ensure it is functioning correctly.
• **Resistance and Voltage: Check the resistance and voltage output of the sensor according to the manufacturer’s specifications.
• Check Power and Ground: Ensure 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: Since the steering angle sensor communicates over the CAN bus, check for any issues with the CAN network.
• **Termination Resistors: Ensure that the CAN bus termination resistors are present and functioning correctly.
• **Bus Communication: Use a scan tool to monitor the CAN bus for any communication issues or faults.
• Look for Software Issues: **ECU Updates: Check if there are any software updates available for the vehicle’s ECU that may address communication issues.
• **Resetting Codes: Clear the trouble codes and see if the U2643 code returns after a test drive.
• Inspect Related Components: Check other components that may affect the steering angle sensor, such as the steering column, steering rack, or any related sensors (e.g., yaw rate sensor).
• Perform a Calibration: If the steering angle sensor has been replaced or if there have been significant repairs, it may need to be calibrated using a scan tool.
• 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.
• Seek Professional Help: If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle’s specific systems. By following these troubleshooting steps, you should be able to identify the root cause of the U2643 code and take appropriate action to resolve the issue.