U1765 – Module Communication Failure

The ODBII code U1765 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 U1765 is moderate.

Common Causes For: U1763 U1763: “Module Communication Failure”

• Faulty wiring or connectors
• Failed control module
• Corrupted software or firmware
• Poor ground connections
• Intermittent communication issues
• Low battery voltage
• Electrical interference
• Damaged or corroded pins in connectors

Common misdiagnosis for U1765 U1765: “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

Common Troubleshooting Steps

The OBD-II code U1765 indicates a “Module Communication Failure,” which typically means that there is a problem with communication between various modules in the vehicle’s network. 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. Other codes may provide more context or indicate which module is having communication issues.
• Inspect Wiring and Connectors: Visually inspect the wiring and connectors associated with the affected modules. 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 Module Power Supply: Ensure that the affected module(s) are receiving the proper voltage. Use a multimeter to check the power supply to the module.
• If the module is not receiving power, trace the wiring back to the fuse box and check for blown fuses or damaged wires.
• Test the Affected Module: If you can identify which module is having communication issues, test it for functionality. This may involve using a specialized scan tool or diagnostic equipment.
• If the module is faulty, it may need to be repaired or replaced.
• Check for Network Issues: Inspect the CAN (Controller Area Network) bus wiring for shorts, opens, or other issues. The CAN bus is responsible for communication between modules.
• Use a scan tool to monitor the CAN bus for any irregularities in communication.
• Reset the Modules: Sometimes, resetting the modules can resolve communication issues. Disconnect the battery for a few minutes, then reconnect it and see if the code returns.
• Alternatively, use a scan tool to clear the codes and see if they reappear.
• Update Software/Firmware: Check if there are any software or firmware updates available for the affected modules. Sometimes, communication issues can be resolved with an update.
• Consult Technical Service Bulletins (TSBs): Look for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on known communication issues.
• Professional Diagnosis: If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have access to advanced diagnostic tools and resources.
• Document Findings: Keep a record of any codes, symptoms, and steps taken during the troubleshooting process. This information can be helpful for further diagnosis or when consulting with a professional. By following these steps, you can systematically diagnose and potentially resolve the U1765 code and any associated communication issues in your vehicle.