U2259 – Module Communication Failure

The ODBII code U2259 indicates a “Module Communication Failure,” meaning there is a problem with communication between vehicle control modules, often due to a fault in wiring, connectors, or the modules themselves.

The severity of ODBII code U2259 is moderate.

Common Causes For: U2258 U2258: “Module Communication Failure”

• Faulty wiring or connectors
• Failed or malfunctioning control module
• Poor ground connections
• Corrupted software or firmware in the module
• Interference from aftermarket devices
• Low battery voltage or power supply issues
• Communication network issues (e.g., CAN bus problems)

Common misdiagnosis for U2259 U2259: “Module Communication Failure”

• Faulty wiring or connectors
• Defective control module
• Software issues or updates needed
• Power supply problems
• Grounding issues
• Intermittent communication issues
• Other module failures (e.g., ABS, BCM)
• Corrupted data or configuration errors

Common Troubleshooting Steps

The OBD-II code U2259 indicates a “Module Communication Failure,” which typically means that there is a problem with communication between various control modules in the vehicle. 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 modules. 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 modules are receiving the proper voltage. Use a multimeter to check the power supply to the modules.
• Test the Modules: If possible, test the affected modules individually to ensure they are functioning correctly. This may involve using specialized diagnostic tools or software.
• Check for Short Circuits: Inspect the wiring harness for any short circuits that could be causing communication issues. This may involve checking for continuity and resistance in the wiring.
• Look for Intermittent Issues: Sometimes, communication failures can be intermittent. Pay attention to when the code appears (e.g., during specific driving conditions) and check for any patterns.
• Update Software/Firmware: Check if there are any software or firmware updates available for the vehicle’s control modules. Sometimes, manufacturers release updates to fix communication issues.
• Perform a Network Scan: If you have access to advanced diagnostic tools, perform a network scan to see if other modules are communicating properly. This can help identify if the issue is isolated to one module or if it affects multiple modules.
• Reset the Codes: After performing checks and repairs, clear the 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 known communication issues. 1
• Seek Professional Help: If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who specializes in automotive electronics. By following these troubleshooting steps, you can systematically identify and resolve the underlying cause of the U2259 code.