U1757 – Module Communication Failure

The ODBII code U1757 indicates a “Module Communication Failure,” meaning there is a problem with communication between vehicle control modules, often due to a wiring issue, a faulty module, or a network problem.

The severity of ODBII code U1757 is moderate.

Common Causes For: U1756 U1756: “Module Communication Failure”

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

Common misdiagnosis for U1757 U1757: “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 communication protocol failures

Common Troubleshooting Steps

The OBD-II code U1757 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. Sometimes, other codes can provide context or lead to the root cause of the communication failure.
• Inspect Wiring and Connectors: **Visual Inspection: Check the wiring harnesses and connectors associated with the affected modules for any signs of damage, corrosion, or loose connections.
• **Repair or Replace: Repair any damaged wires or connectors and ensure that all connections are secure.
• Check Power and Ground: **Power Supply: Verify that the affected module(s) are receiving the correct voltage. Use a multimeter to check the power supply to the module.
• **Ground Connections: Ensure that the ground connections for the module are clean and secure.
• Test the Affected Module: If you can identify which module is having communication issues, you may need to test or replace that module. This can often be done using specialized diagnostic tools.
• Check for Short Circuits: Inspect the wiring for any short circuits that may be causing communication issues. This can include checking for pinched wires or damaged insulation.
• Look for Intermittent Issues: Sometimes, communication failures can be intermittent. Pay attention to when the code appears (e.g., during specific driving conditions) and check for any patterns.
• Update Software/Firmware: Check if there are any software or firmware updates available for the vehicle’s modules. Sometimes, manufacturers release updates to fix communication issues.
• Perform a Network Scan: Use a professional-grade scan tool to perform a network scan of all modules. This can help identify which module is not communicating properly.
• Check for Environmental Factors: Ensure that there are no environmental factors affecting the modules, such as moisture or extreme temperatures.
• 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 common communication issues.1
• Reset the System: After performing repairs, clear the codes and see if the issue reoccurs. Sometimes, a simple reset can resolve temporary communication issues.1
• Seek Professional Help: If the problem persists after performing these steps, it may be necessary to consult a professional mechanic or dealership for further diagnosis. By following these steps, you can systematically identify and resolve the underlying issues causing the U1757 code.