U2161 – Module Communication Failure

The ODBII code U2161 indicates a “Module Communication Failure,” meaning there is a problem with communication between the vehicle’s control modules, often due to a fault in the wiring, connectors, or the modules themselves.

The severity of ODBII code U2161 is generally considered moderate.

Common Causes For: U2160 U2160: “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 U2161 U2161: “Module Communication Failure”

• Faulty wiring or connectors
• Defective control module
• Power supply issues
• Grounding problems
• Software glitches or updates needed
• Intermittent communication issues
• Other communication protocol failures

Common Troubleshooting Steps

The OBD-II code U2161 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 Other Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, other codes can provide additional context for the communication failure.
• Inspect Wiring and Connectors:
• Visually inspect the wiring 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.
• Check Power Supply: Ensure that the affected module is receiving the proper voltage and ground. Use a multimeter to check the power supply to the module.
• Test the Module: If possible, test the affected module to ensure it is functioning correctly. This may involve bench testing or swapping with a known good module.
• Check for Intermittent Issues: Sometimes, communication failures can be intermittent. Try to replicate the conditions under which the code was set, and monitor the system for any irregularities.
• Inspect the CAN Bus: If the vehicle uses a Controller Area Network (CAN) bus for communication, check the integrity of the bus. Look for short circuits, open circuits, or any other issues that could disrupt communication.
• Update Software/Firmware: Check if there are any software or firmware updates available for the vehicle’s modules. Sometimes, communication issues can be resolved with an update.
• Clear Codes and Test Drive: After performing any repairs or inspections, clear the trouble codes and take the vehicle for a test drive to see if the code returns.
• Consult Service Manual: Refer to the vehicle’s service manual for specific diagnostic procedures related to the U2161 code and the affected module(s).
• Seek Professional Help: If the issue persists after performing the above 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 steps, you can systematically diagnose and potentially resolve the U2161 code and the underlying communication failure.