U1564 – Module Communication Failure

The ODBII code U1564 indicates a communication failure between modules in the vehicle’s network, suggesting that one or more electronic control units (ECUs) are unable to communicate properly with each other.

The severity of ODBII code U1564 is moderate.

Common Causes For: U1563 U1563: “Module Communication Failure”

• Faulty wiring or connectors
• Failed or malfunctioning module
• Corroded or damaged connectors
• Poor ground connections
• Intermittent electrical issues
• Software or firmware issues
• Low battery voltage
• Communication network issues (e.g., CAN bus problems)

Common misdiagnosis for U1564 U1564: “Module Communication Failure”

• Faulty wiring or connectors
• Defective control module
• Software issues or updates needed
• Battery or power supply problems
• Grounding issues
• Intermittent communication issues
• Other unrelated module failures

Common Troubleshooting Steps

The OBD-II code U1564 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 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: Examine the wiring and connectors associated with the affected modules. Look for signs of damage, corrosion, loose connections, or broken wires. Pay special attention to ground connections.
• Check Power Supply: Ensure that the affected module is receiving the proper voltage and ground. Use a multimeter to check the power and ground circuits.
• Inspect Modules: If the code points to a specific module, inspect that module for physical damage or signs of water intrusion. If possible, test the module in another vehicle to confirm its functionality.
• Clear Codes and Test Drive: Clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive. Sometimes, the issue may be temporary, and clearing the codes can help determine if the problem persists.
• Check for Software Updates: Some communication issues can be resolved with software updates. Check with the vehicle manufacturer or a dealership to see if there are any updates available for the affected modules.
• Perform a Network Test: If the vehicle has multiple modules, perform a network test to check for communication between them. This may require specialized diagnostic equipment.
• Look for Interference: Sometimes, aftermarket accessories or modifications can interfere with module communication. If any modifications have been made, consider removing them to see if the issue resolves.
• Consult Wiring Diagrams: Refer to the vehicle’s wiring diagrams to understand the communication network and identify any potential issues in the communication lines.
• Seek Professional Help: If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific vehicle make and model. By following these troubleshooting steps, you can systematically identify and resolve the underlying cause of the U1564 code.