U1314 – Module Communication Failure

The ODBII code U1314 indicates a “Module Communication Failure,” meaning there is a problem with communication between vehicle control modules, which can affect their ability to share data and function properly.

The severity of ODBII code U1314 is moderate.

Common Causes For: U1313 Lost Communication with the Steering Angle Sensor.

• Faulty wiring or connectors
• Failed or malfunctioning control module
• Poor ground connections
• Corroded or damaged pins in connectors
• Intermittent electrical issues
• Software or firmware issues in the module
• Low battery voltage or power supply issues
• Communication network issues (e.g., CAN bus problems)

Common misdiagnosis for U1314 U1314: “Module Communication Failure”

• Faulty wiring or connectors
• Defective control module
• Software issues or updates needed
• Battery or power supply problems
• Grounding issues
• Intermittent communication issues
• Other communication protocol failures

Common Troubleshooting Steps

The OBD-II code U1314 indicates a “Module Communication Failure,” which typically means that there is a problem with communication between the vehicle’s control modules. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check for Other Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, other codes can provide additional context for the communication failure.
• Inspect Wiring and Connectors:
• Visually inspect the wiring and connectors associated with the affected modules. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the ground connections, as poor grounding can lead to communication issues.
• Check Power Supply: Ensure that the affected modules are receiving the proper voltage. Use a multimeter to check the power supply to the modules.
• Test Communication Lines:
• Use a scan tool to check the communication lines (CAN bus, LIN bus, etc.) for continuity and proper voltage levels.
• If you have access to an oscilloscope, you can check the signal waveforms on the communication lines to ensure they are functioning correctly.
• Inspect Modules:
• If possible, check the affected module for any signs of physical damage or water intrusion.
• If you suspect a specific module is faulty, you may consider swapping it with a known good module to see if the issue resolves.
• Reset Modules: Sometimes, resetting the modules can clear communication errors. Disconnect the battery for a few minutes or use a scan tool to clear the codes and see if the issue persists.
• Check for Software Updates: Ensure that the vehicle’s modules have the latest software updates. Sometimes, communication issues can be resolved with a software update.
• Look for Intermittent Issues: If the problem is intermittent, try to replicate the conditions under which the code appears. This can help identify specific triggers for the communication failure.
• Consult Wiring Diagrams: Refer to the vehicle’s service manual for wiring diagrams and communication protocols to better understand how the modules communicate and where potential issues may lie.
• Professional Diagnosis: If the issue persists after performing these steps, it may be necessary to consult a professional technician or dealership for further diagnosis. They may have specialized tools and knowledge to pinpoint the problem. By following these steps, you should be able to identify and potentially resolve the U1314 code.