U1932 – Module Communication Failure

The ODBII code U1932: Module Communication Failure indicates that there is a communication issue between the vehicle’s control modules, preventing them from exchanging data properly.

Moderate.

Common Causes For: U1886: Communication Line Malfunction

• Faulty wiring or connectors
• Malfunctioning control module
• Corrupted software or firmware in the module
• Poor ground connections
• Interference from aftermarket devices
• Low battery voltage
• Communication network issues (e.g., CAN bus problems)
• Damaged or corroded pins in connectors
• Incompatible or missing modules in the network

Common misdiagnosis for U1932: Module Communication Failure

• Faulty wiring or connectors
• Defective control module
• Software issues or outdated firmware
• Battery or power supply problems
• Grounding issues
• Intermittent communication issues
• Incorrectly configured or programmed modules
• Faulty sensors or actuators
• Corrupted data or communication protocols
• Environmental interference (e.g., electromagnetic interference)

Common Troubleshooting Steps

The OBD-II code **U1932: Module Communication Failure** indicates that there is a communication issue between the vehicle’s control modules. 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 and help identify the root cause of the communication failure.
• Inspect Wiring and Connectors:
• Visually inspect the wiring harnesses and connectors associated with the affected module(s). Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the ground connections, as poor grounding can lead to communication issues.
• Test the Affected Module:
• If you can identify which module is having communication issues, test it for proper operation. This may involve checking power and ground to the module, as well as its ability to communicate with other modules.
• If possible, swap the module with a known good one to see if the problem persists.
• Check the CAN Bus:
• The communication between modules typically occurs over the Controller Area Network (CAN) bus. Use a multimeter or an oscilloscope to check the voltage levels on the CAN bus wires.
• Look for any short circuits, open circuits, or abnormal voltage levels that could indicate a problem.
• Inspect for Interference:
• Ensure that there are no aftermarket devices or modifications that could be interfering with the vehicle’s communication network. This includes things like alarm systems, stereo installations, or other electronic accessories.
• Perform a Network Test:
• Some advanced scan tools can perform a network test to check the communication between modules. This can help identify which module is not responding or is causing the communication failure.
• Check for Software Updates:
• In some cases, a software update may be available for the affected module(s). Check with the manufacturer or a dealership to see if any updates are needed.
• Clear Codes and Test Drive:
• After performing any repairs or adjustments, clear the trouble codes 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 specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to module communication.
• 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 and its electronic systems. By following these troubleshooting steps, you can systematically identify and resolve the underlying cause of the U1932 code.