U2347 – Control Module Communication Fault

The ODBII code U2347 indicates a “Control Module Communication Fault,” which means there is a problem with the communication between various control modules in the vehicle’s network.

The severity of ODBII code U2347 is moderate.

Common Causes For: U2345 U2345: “Module Communication Failure”

• Faulty control module
• Poor electrical connections
• Damaged wiring harness
• Corroded connectors
• Software issues or bugs
• Low battery voltage
• Interference from aftermarket devices
• Faulty CAN bus communication
• Grounding issues

Common misdiagnosis for U2347 U2347: “Control Module Communication Fault”

• Faulty control module
• Wiring issues or damaged connectors
• Corrupted software or firmware in the control module
• Battery or power supply problems
• Grounding issues
• Intermittent communication faults
• Faulty sensors or actuators
• Incorrectly configured or incompatible aftermarket parts

Common Troubleshooting Steps

When dealing with OBD-II code U2347, which indicates a “Control Module Communication Fault,” 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 trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue.
• Inspect Wiring and Connectors: **Visual Inspection: Check the wiring and connectors related to the control modules for any signs of damage, corrosion, or loose connections.
• **Connector Pins: Ensure that the pins in the connectors are not bent or corroded.
• Verify Power and Ground: Check that the affected control module(s) are receiving the proper power and ground. Use a multimeter to measure voltage and continuity.
• Check Communication Lines: Inspect the CAN (Controller Area Network) bus lines for continuity and shorts. Use a multimeter to check for proper resistance and ensure there are no breaks in the wiring.
• Test Control Modules: If possible, test the affected control module(s) to ensure they are functioning correctly. This may involve swapping with a known good module if available.
• Clear Codes and Test Drive: Clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns. This can help determine if the issue is intermittent.
• Check for Software Updates: Sometimes, control modules may require software updates. Check with the manufacturer or a dealership to see if there are any updates available for the modules in question.
• Inspect for Environmental Factors: Look for any environmental factors that could affect communication, such as water intrusion or excessive heat.
• Consult Technical Service Bulletins (TSBs): Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to communication faults.
• Professional Diagnosis: If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized diagnostic tools and experience with the specific vehicle.Conclusion Troubleshooting OBD-II code U2347 requires a systematic approach to identify the root cause of the communication fault. By following these steps, you can narrow down the potential issues and work towards a resolution.