U1380 – Module Communication Failure

The ODBII code U1380 indicates a “Module Communication Failure,” meaning there is a problem with communication between the vehicle’s control modules, which may affect their ability to share data or function properly.

The severity of ODBII code U1380 is moderate.

Common Causes For: U1379 Invalid Data Received from Vehicle Control Module.

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

Common misdiagnosis for U1380 U1380: “Module Communication Failure”

• Faulty wiring or connectors
• Defective control module
• Power supply issues
• Software glitches or updates needed
• Grounding problems
• Intermittent communication issues
• Other module failures (e.g., ABS, BCM)
• Sensor malfunctions
• Battery or charging system issues
• Corrupted data or configuration errors

Common Troubleshooting Steps

The OBD-II code U1380 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 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: Examine the wiring and connectors associated with the affected modules. Look for signs of damage, corrosion, loose connections, or broken wires. Pay special attention to ground connections.
• Verify Power Supply: Ensure that the affected module is receiving the correct voltage and ground. Use a multimeter to check the power and ground circuits.
• Check for Module Updates: Some manufacturers release software updates for their control modules. Check if there are any updates available for the modules involved and apply them if necessary.
• Inspect the CAN Bus: The Controller Area Network (CAN) bus is responsible for communication between modules. Check for any issues with the CAN bus wiring, such as shorts, opens, or interference. You can use an oscilloscope to monitor the CAN signals.
• Test the Affected Module: If you suspect a specific module is causing the issue, you can test it by swapping it with a known good module (if available) or performing a bench test if possible.
• Clear Codes and Test Drive: After performing any repairs or checks, clear the trouble codes and take the vehicle for a test drive to see if the code returns.
• Check for Environmental Factors: Sometimes, environmental factors such as moisture or extreme temperatures can affect module communication. Ensure that the modules are not exposed to conditions that could cause failure.
• Consult Technical Service Bulletins (TSBs): Check for any TSBs related to the U1380 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues.
• Professional Diagnosis: If the issue persists after performing the above 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 can systematically identify and resolve the underlying issue causing the U1380 code.