U1322 – Control Module Communication Failure

The ODBII code U1322 indicates a communication failure between control modules in a vehicle, suggesting that one or more modules are not able to exchange data properly.

The severity of ODBII code **U1322: Control Module Communication Failure** is generally considered moderate to severe.

Common Causes For: U1288: Module Communication Error

• Faulty control module
• Damaged wiring or connectors
• Poor ground connections
• Corroded terminals
• Intermittent electrical connections
• Software issues or bugs
• Low battery voltage
• Faulty communication network (CAN bus issues)
• Aftermarket modifications or installations
• Environmental factors (moisture, heat) affecting components

Common misdiagnosis for U1322: Control Module Communication Failure

• Faulty control module
• Wiring issues
• Poor ground connections
• Corroded connectors
• Software glitches
• Battery or charging system problems
• Intermittent faults in communication lines
• Faulty sensors or actuators
• Incorrectly configured aftermarket components
• Electrical interference from other systems

Common Troubleshooting Steps

The OBD-II code **U1322: Control Module Communication Failure** indicates that there is a communication issue between the control modules in the vehicle. 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.
• Inspect Wiring and Connectors:
• Visually inspect the wiring and connectors associated with the control modules. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the wiring harnesses that connect the affected modules.
• Check Power and Ground:
• Ensure that the control modules have proper power and ground connections. Use a multimeter to check for voltage and continuity at the module connectors.
• Test Control Modules:
• If possible, test the affected control modules individually. This may involve swapping them with known good modules or using a diagnostic tool to check their functionality.
• Inspect the CAN Bus:
• If the vehicle uses a Controller Area Network (CAN) bus, check for issues with the bus itself. Look for short circuits, open circuits, or other faults in the communication lines.
• Use an oscilloscope to monitor the CAN signals if you have access to one.
• 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 control modules.
• 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 returns.
• Consult Service Manual:
• Refer to the vehicle’s service manual for specific diagnostic procedures related to the U1322 code and the control modules involved.
• 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. By following these steps, you can systematically identify and resolve the underlying cause of the U1322 code.