U1328 – Control Module Communication Fault

The ODBII code U1328 indicates a “Control Module Communication Fault,” which means there is a problem with the communication between various control modules in the vehicle’s network.

Moderate.

Common Causes For: U1327 Manufacturer Specific” code, which typically indicates a communication issue between modules in the vehicle’s network.

• Faulty control module
• Poor electrical connections
• Damaged wiring harness
• Corroded connectors
• Software issues or bugs
• Low battery voltage
• Interference from aftermarket devices
• Faulty CAN bus communication
• Grounding issues
• Faulty sensors or actuators

Common misdiagnosis for U1328 U1328: “Control Module Communication Fault”

• Faulty control module
• Wiring issues or shorts
• Poor ground connections
• Corroded connectors
• Software glitches or outdated firmware
• Battery or charging system problems
• Intermittent communication issues
• Faulty sensors or actuators

Common Troubleshooting Steps

The OBD-II code U1328 indicates a “Control Module Communication Fault.” This code typically suggests that there is a communication issue between various control modules in the vehicle. 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, other codes can provide context or lead to the root cause of the communication fault.
• Inspect Wiring and Connectors: Visually inspect the wiring and connectors associated with the control modules. Look for signs of damage, corrosion, loose connections, or frayed wires.
• Pay special attention to the connectors for the modules that are involved in the communication network.
• Check for Ground Issues: Ensure that all control modules have a good ground connection. A poor ground can lead to communication issues.
• Use a multimeter to check for continuity between the ground points and the battery negative terminal.
• Verify Power Supply: Check that the control modules are receiving the correct voltage. Use a multimeter to measure the voltage at the power supply pins of the affected modules.
• Ensure that the battery is in good condition and fully charged.
• Inspect the CAN Bus: If your vehicle uses a Controller Area Network (CAN) bus, check the integrity of the bus wiring. Look for shorts, opens, or any damage to the CAN bus wires.
• Use an oscilloscope or a CAN bus diagnostic tool to monitor the bus signals for proper communication.
• Check for Module Malfunction: If the wiring and connections are good, the issue may lie with one of the control modules themselves. Consider testing or replacing the suspected module.
• If possible, swap the suspected module with a known good one to see if the problem persists.
• Reset the Codes: After performing any repairs or adjustments, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult Technical Service Bulletins (TSBs): Check for any TSBs related to the U1328 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes.
• Professional Diagnosis: If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized diagnostic tools and experience with your vehicle.Conclusion Troubleshooting a U1328 code can be complex due to the nature of control module communication. Following these steps systematically can help identify and resolve the underlying issue. Always refer to the vehicle’s service manual for specific information related to your make and model.