U1383 – Module Communication Failure

The ODBII code U1383 indicates a “Module Communication Failure,” which means there is a problem with communication between the vehicle’s control modules, potentially due to a wiring issue, a faulty module, or a network problem.

The severity of ODBII code U1383 is moderate.

Common Causes For: U1382 U1382: “Module Communication Failure”

• Faulty wiring or connectors
• Failed or malfunctioning module
• Corrupted software or firmware in the module
• Poor ground connections
• Intermittent electrical issues
• Low battery voltage
• Communication network issues (e.g., CAN bus problems)
• Incompatible or aftermarket modules installed

Common misdiagnosis for U1383 U1383: “Module Communication Failure”

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

Common Troubleshooting Steps

The OBD-II code U1383 indicates a “Module Communication Failure,” which typically means that there is a problem with communication between various modules in the vehicle’s network. 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 Module Functionality: Identify the specific module that is reporting the communication failure. Check if the module is functioning properly. This may involve testing the module with a scan tool or replacing it if necessary.
• Check for Software Updates: Sometimes, communication issues can be resolved with a software update. Check with the vehicle manufacturer for any available updates for the affected modules.
• Inspect the CAN Bus: The Controller Area Network (CAN) bus is responsible for communication between modules. Use a multimeter or oscilloscope to check for proper voltage levels and signal integrity on the CAN bus wires.
• Test the Battery and Charging System: A weak battery or charging system can cause communication issues. Ensure that the battery is fully charged and that the charging system is functioning correctly.
• Clear Codes and Test Drive: After performing any repairs or inspections, clear the trouble codes and take the vehicle for a test drive to see if the code reappears.
• Check for Intermittent Issues: If the code is intermittent, monitor the vehicle for any specific conditions that trigger the code, such as temperature changes, vibrations, or specific driving conditions.
• 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 module communication.
• Seek Professional Help: If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or dealership with experience in diagnosing complex electrical and communication issues. By following these steps, you can systematically identify and resolve the underlying cause of the U1383 code.