U1369 – Module Communication Failure

The ODBII code U1369 indicates a “Module Communication Failure,” meaning there is a problem with communication between the vehicle’s control modules, which may affect their ability to exchange data properly.

The severity of ODBII code U1369 is moderate.

Common Causes For: U1368 U1368: “Control Module Communication Failure”

• Faulty wiring or connectors
• Failed or malfunctioning module
• Corrupted software or firmware in the module
• Poor ground connections
• Interference from other electronic devices
• Low battery voltage or weak battery
• Communication network issues (e.g., CAN bus problems)
• Water intrusion or corrosion in connectors
• Improperly installed aftermarket accessories
• Faulty or damaged sensors

Common misdiagnosis for U1369 U1369: “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 U1369 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 additional trouble codes. Sometimes, other codes can provide context or lead to the root cause of the communication failure.
• Inspect Wiring and Connectors:
• Visually inspect the wiring and connectors associated with the affected module(s). Look for signs of damage, corrosion, or loose connections.
• Pay special attention to ground connections, as poor grounding can lead to communication issues.
• Check Power Supply: Ensure that the affected module is receiving the proper voltage and ground. Use a multimeter to check the power supply to the module.
• Test the Module: If possible, test the affected module to ensure it is functioning correctly. This may involve bench testing or swapping with a known good module.
• Check for Intermittent Issues: Sometimes, communication failures can be intermittent. Try to replicate the issue by driving the vehicle under different conditions (e.g., temperature, speed, etc.).
• Inspect the CAN Bus: If the vehicle uses a Controller Area Network (CAN) bus for communication, check for issues on the bus:
• Look for short circuits or open circuits in the CAN wiring.
• Use an oscilloscope to check the CAN signals for proper voltage levels and waveforms.
• Update Software/Firmware: Check if there are any software or firmware updates available for the vehicle’s modules. Sometimes, communication issues can be resolved with an update.
• Clear Codes and Test Drive: After performing any repairs or adjustments, clear the trouble codes and take the vehicle for a test drive to see if the code returns.
• Consult Service Manual: Refer to the vehicle’s service manual for specific diagnostic procedures related to the U1369 code and the affected module(s).
• Seek Professional Help: If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or dealership with advanced diagnostic tools. By following these steps, you can systematically diagnose and potentially resolve the U1369 code and its underlying communication issues.