U1362 – Module Communication Failure

The ODBII code U1362: Module Communication Failure indicates that there is a communication issue between the vehicle’s control modules, preventing them from exchanging data properly.

The severity of ODBII code **U1362: Module Communication Failure** is generally considered moderate to severe.

Common Causes For: U1347: Module Communication Error

• Faulty wiring or connectors
• Failed control module
• Poor ground connections
• Corroded terminals
• Intermittent communication issues
• Software or firmware issues
• Low battery voltage
• Electrical interference
• Damaged or malfunctioning sensors
• Incompatible aftermarket components

Common misdiagnosis for U1362: 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 **U1362: Module Communication Failure** indicates that there is a communication issue between the vehicle’s control modules. This can be caused by various factors, including wiring issues, faulty modules, or problems with 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. This can provide more context about the issue and help identify which module is having communication problems.
• 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 the ground connections, as poor grounding can lead to communication failures.
• Check the Module:
• If a specific module is indicated in conjunction with the U1362 code, check that module for proper operation. This may involve testing the module’s power and ground circuits.
• If possible, swap the suspected faulty module with a known good one to see if the problem persists.
• Test the CAN Bus:
• Use a multimeter or an oscilloscope to check the CAN (Controller Area Network) bus signals. Ensure that the voltage levels are within the expected range and that there are no short circuits or open circuits.
• Look for any abnormal signals or noise on the bus that could indicate a problem.
• Check for Intermittent Issues:
• Sometimes, communication failures can be intermittent. Pay attention to when the code appears (e.g., during specific driving conditions or after certain events) and try to replicate the issue.
• Inspect for Water Damage:
• Check for any signs of water intrusion in the module or wiring harnesses, as moisture can cause communication issues.
• Update Software/Firmware:
• In some cases, a software update for the vehicle’s control modules may resolve communication issues. Check with the manufacturer for any available updates.
• 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 U1362 code returns.
• Consult Technical Service Bulletins (TSBs):
• Check for any TSBs related to the U1362 code or the specific modules involved. Manufacturers may have issued guidance on known issues and fixes.
• Professional Diagnosis:
• If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership with experience in diagnosing communication issues in your specific vehicle make and model. By following these steps, you should be able to identify and resolve the underlying cause of the U1362 code.