U2055 – Lost Communication with Vehicle Control Module.

The ODBII code U2055 indicates a loss of communication with the vehicle control module, suggesting that the module is not responding or is unable to communicate with other systems in the vehicle.

The severity of ODBII code U2055 is generally considered moderate to severe.

Common Causes For: U2054 Lost Communication with the Steering Angle Sensor.

• Faulty Vehicle Control Module (VCM)
• Damaged wiring or connectors
• Poor ground connections
• Corrupted software or firmware
• Faulty communication network (CAN bus issues)
• Malfunctioning sensors or actuators
• Battery or power supply issues
• Intermittent electrical connections

Common misdiagnosis for U2055 Lost Communication with Vehicle Control Module.

• Faulty Vehicle Control Module (VCM)
• Wiring issues or damaged connectors
• Faulty power supply or ground connections
• Issues with other control modules
• Faulty diagnostic tools or software
• Incorrectly programmed or updated modules
• Faulty sensors or actuators related to communication
• Corrupted data or software glitches in the vehicle’s network

Common Troubleshooting Steps

The OBD-II code U2055 indicates a “Lost Communication with Vehicle Control Module.” This code typically points to a communication issue between the vehicle’s control modules, which can be caused by various factors. Here are some common troubleshooting steps to help diagnose and resolve the issue:

• Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes. Other codes may provide more context or indicate related issues.
• Inspect Wiring and Connectors:
• Visually inspect the wiring and connectors associated with the vehicle control module (VCM) and any other modules that may be involved.
• Look for damaged, corroded, or loose connections that could disrupt communication.
• Check Power and Ground:
• Ensure that the control module has proper power and ground connections. 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 Control Module:
• If possible, test the control module itself. This may involve using a scan tool to check for communication with the module or swapping it with a known good module if available.
• Some vehicles may require specific procedures to reset or reprogram the module.
• Inspect for Short Circuits:
• Check for any short circuits in the wiring harness that could be causing communication issues. This may involve using a multimeter to test for continuity and resistance.
• Check for Software Updates:
• Some manufacturers release software updates for control modules. Check if there are any available updates for the vehicle’s control modules that may address communication issues.
• Look for Environmental Factors:
• Sometimes, environmental factors such as moisture or extreme temperatures can affect module performance. Inspect for signs of water intrusion or damage.
• Perform a Network Test:
• If the vehicle has multiple control modules, perform a network test to see if other modules are communicating properly. This can help identify if the issue is isolated to one module or if it’s a broader communication problem.
• Clear Codes and Test Drive:
• After performing any repairs or adjustments, clear the trouble codes and take the vehicle for a test drive to see if the code reappears.
• Consult Technical Service Bulletins (TSBs):
• Check for any TSBs related to the U2055 code for your specific vehicle make and model. Manufacturers may have documented common issues and fixes. If these steps do not resolve the issue, it may be necessary to consult a professional technician or dealership for further diagnosis, as they may have access to specialized tools and resources.