U2887 – Module Communication Failure

The ODBII code U2887 indicates a “Module Communication Failure,” meaning there is a problem with communication between vehicle control modules, which can affect their ability to share data and function properly.

The severity of ODBII code U2887 is generally considered moderate to severe.

Common Causes For: U2885 U2885: Vehicle Communication Bus Malfunction

• Faulty wiring or connectors
• Failed or malfunctioning control module
• Poor ground connections
• Intermittent communication issues
• Software or firmware issues
• Corroded terminals
• Electrical interference
• Low battery voltage or weak battery
• Damaged or frayed harnesses
• Incompatible or aftermarket modules

Common misdiagnosis for U2887 U2887: “Module Communication Failure”

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

Common Troubleshooting Steps

The OBD-II code U2887 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 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 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 Module 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.
• If the module is not powered correctly, trace the wiring back to the power source.
• Test the Affected Module:
• If possible, test the affected module to see if it is functioning correctly. This may involve bench testing or swapping with a known good module.
• If the module is faulty, it may need to be replaced.
• Inspect the CAN Bus:
• The communication between modules often occurs over a Controller Area Network (CAN) bus. Check for any issues with the CAN bus wiring, such as shorts or opens.
• Use an oscilloscope or a CAN bus diagnostic tool to monitor the bus for proper communication signals.
• Check for Interference:
• Look for any aftermarket devices or modifications that may interfere with the vehicle’s communication network. This includes alarms, stereo systems, or other electronic devices.
• Perform a Network Scan:
• Use a professional-grade scan tool to perform a network scan. This can help identify which module(s) are not communicating and provide more detailed information about the issue.
• Reset the Modules:
• Sometimes, simply resetting the modules can resolve communication issues. This can be done by disconnecting the battery for a few minutes or using a scan tool to clear the codes.
• 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.
• Consult Service Manual:
• Refer to the vehicle’s service manual for specific diagnostic procedures related to the U2887 code. This may provide additional insights or steps tailored to your vehicle model. 1
• Seek Professional Help:
• If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician who has experience with automotive electronics and communication systems. By following these troubleshooting steps, you should be able to identify and resolve the underlying cause of the U2887 code.