U1368 – Control Module Communication Failure

The ODBII code U1368 indicates a communication failure between control modules in a vehicle, suggesting that one or more modules are not properly communicating with each other.

The severity of ODBII code U1368 is moderate.

Common Causes For: U1366 U1366: “Control Module Communication Failure”

• Faulty control module
• Poor electrical connections
• Damaged wiring or harness
• Corroded connectors
• Software issues or bugs
• Low battery voltage
• Interference from aftermarket devices
• Faulty sensors or actuators
• Grounding issues
• Communication network failure (e.g., CAN bus issues)

Common misdiagnosis for U1368 U1368: “Control Module Communication Failure”

• Faulty control module
• Wiring issues
• Poor ground connections
• Corrupted software/firmware
• Faulty sensors
• Communication network issues
• Battery or power supply problems
• Intermittent connection issues

Common Troubleshooting Steps

When dealing with OBD-II code U1368, which indicates a “Control Module Communication Failure,” 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.
• Check Power and Ground: Verify that the control module has the proper power supply and ground. Use a multimeter to check voltage at the module’s power and ground pins.
• Test Communication Lines: Use a scan tool to check if the control module is communicating with other modules. If possible, perform a network test to see if the communication lines (CAN bus, LIN bus, etc.) are functioning correctly.
• Look for short circuits or open circuits in the communication lines.
• Inspect for Intermittent Issues: Sometimes, communication failures can be intermittent. Check for any patterns or specific conditions under which the code appears (e.g., temperature, vehicle speed).
• Check for Software Updates: Verify if there are any software updates available for the control modules. Sometimes, manufacturers release updates to fix communication issues.
• Reset the Codes: Clear the trouble codes using the OBD-II scanner and see if the code returns. If it does, further investigation is needed.
• Test the Control Module: If all else fails, the control module itself may be faulty. Consider testing or replacing the module if it is determined to be the source of the problem.
• Consult Technical Service Bulletins (TSBs): Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have documented common issues and solutions.
• Seek Professional Help: If you are unable to resolve the issue, it may be best to consult a professional mechanic or technician who has experience with the specific vehicle and its systems.Conclusion Troubleshooting OBD-II code U1368 requires a systematic approach to identify the root cause of the communication failure. By following these steps, you can narrow down the potential issues and work towards a solution.