U2164 – Module Communication Failure

The ODBII code U2164 indicates a communication failure between modules in a 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 U2164 is generally considered moderate.

Common Causes For: U2163 U2163: “Module Communication Failure”

• Faulty wiring or connectors
• Failed or malfunctioning control module
• Corrupted software or firmware in the module
• Poor ground connections
• Intermittent electrical issues
• Communication network issues (e.g., CAN bus problems)
• Low battery voltage or power supply issues
• Damaged or shorted circuits

Common misdiagnosis for U2164 U2164: “Module Communication Failure”

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

Common Troubleshooting Steps

The OBD-II code U2164 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 additional trouble codes. Sometimes, other codes can provide context or lead you to the root cause of 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. Use a multimeter to check the power and ground circuits.
• Test the Affected Module: If you can identify which module is having communication issues, you may need to test or replace it. This can involve:
• Checking the module’s functionality with a scan tool.
• Performing a reset or reprogramming if necessary.
• Inspect the CAN Bus:
• If the vehicle uses a Controller Area Network (CAN) bus, check for issues on the bus itself. This can include checking for short circuits, open circuits, or excessive resistance.
• Use an oscilloscope to monitor the CAN signals if you have access to one.
• Check for Interference: Sometimes, aftermarket accessories or modifications can interfere with module communication. If any recent changes have been made to the vehicle, consider reverting them to see if the issue resolves.
• Perform a Hard Reset: Disconnect the vehicle’s battery for a few minutes to reset the modules. Reconnect the battery and see if the code reappears.
• Update Software: In some cases, a software update for the affected module(s) may be necessary. Check with the manufacturer for any available updates.
• 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.
• Seek Professional Help: If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or dealership with advanced diagnostic tools. By following these steps, you can systematically identify and address the underlying cause of the U2164 code.