U2552 – Module Communication Failure

The ODBII code U2552 indicates a “Module Communication Failure,” meaning that there is a problem with communication between the vehicle’s control modules, which may affect their ability to share data or function properly.

The severity of ODBII code U2552 is moderate.

Common Causes For: U2551 Lost Communication with Hybrid Powertrain Control Module (HPCM) A.

• Faulty wiring or connectors
• Malfunctioning control module
• Poor ground connections
• Corrupted software or firmware in the module
• Interference from aftermarket devices
• Low battery voltage
• Communication network issues (e.g., CAN bus problems)
• Damaged or corroded pins in connectors
• Incompatible or missing modules in the network

Common misdiagnosis for U2552 U2552: “Module Communication Failure”

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

Common Troubleshooting Steps

The OBD-II code U2552 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 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 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.
• Verify that the fuses related to the communication network are intact.
• Test Communication Lines:
• Use a scan tool to check the communication lines (CAN bus, LIN bus, etc.) for continuity and proper voltage levels.
• If you have access to an oscilloscope, you can check the signal waveforms on the communication lines to ensure they are functioning correctly.
• Inspect Modules:
• If possible, check the affected modules for any signs of physical damage or water intrusion.
• If you suspect a specific module is faulty, you may need to replace it or test it in another vehicle to confirm its functionality.
• Reset the Modules:
• Sometimes, simply resetting the modules can resolve communication issues. Disconnect the battery for a few minutes, then reconnect it and see if the code returns.
• Update Software/Firmware:
• Check if there are any software or firmware updates available for the vehicle’s control modules. Sometimes, communication issues can be resolved with an update.
• Check for Interference:
• Ensure that there are no aftermarket devices (like alarms, remote starters, etc.) that could be interfering with the communication between modules.
• Consult Wiring Diagrams:
• Refer to the vehicle’s service manual for wiring diagrams to understand the communication network and identify any potential issues.
• Professional Diagnosis:
• If the issue persists after performing the above steps, it may be necessary to consult a professional technician who has experience with the specific make and model of your vehicle. By following these steps, you should be able to identify and resolve the underlying cause of the U2552 code.