U2087 – Module Communication Failure

The ODBII code U2087 indicates a communication failure between modules in the vehicle’s network, suggesting that one or more control modules are not able to communicate properly with each other.

The severity of ODBII code U2087 is moderate.

Common Causes For: U2086 U2086: “Module Communication Failure”

• Faulty wiring or connectors
• Failed or malfunctioning control module
• Poor ground connections
• Corroded or damaged pins in connectors
• Intermittent communication issues
• Software or firmware issues in modules
• Low battery voltage or power supply issues
• Faulty CAN bus communication
• Electrical interference or noise
• Improperly installed aftermarket accessories

Common misdiagnosis for U2087 U2087: “Module Communication Failure”

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

Common Troubleshooting Steps

The OBD-II code U2087 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, multiple codes can provide more context for the issue.
• 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 wiring harnesses that connect the modules, as these can be prone to wear and tear.
• Check Power and Ground:
• Ensure that the affected module has a proper power supply and ground connection. Use a multimeter to check voltage and ground continuity.
• 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 possible, test the affected module to see if it is functioning correctly. This may involve bench testing or swapping it with a known good module.
• If the module is not responding, it may need to be repaired or replaced.
• Check for Communication Issues:
• Use a scan tool to check if other modules in the network are communicating properly. If other modules are also showing communication errors, the issue may be with the communication bus (CAN bus).
• Inspect the CAN bus wiring for shorts, opens, or interference.
• Look for Software Issues:
• Sometimes, a software update may be required for the affected module or the vehicle’s control system. Check with the manufacturer for any available updates.
• Reprogramming or resetting the module may also resolve communication issues.
• Clear Codes and Test Drive:
• After performing any repairs or adjustments, clear the trouble codes using the OBD-II scanner 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 communication issues.
• Seek Professional Help:
• If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or dealership for further diagnosis. They may have specialized tools and knowledge to address complex communication issues. By following these steps, you can systematically diagnose and potentially resolve the U2087 code and its underlying causes.