U1572 – Vehicle Communication Network Malfunction

The ODBII code U1572 indicates a malfunction in the vehicle communication network, which may affect the ability of various modules to communicate with each other.

The severity of ODBII code U1572 is moderate.

Common Causes For: U1571 Communication Bus Off.

• Faulty wiring or connectors in the communication network.
• Malfunctioning control modules.
• Corrupted software or firmware in the modules.
• Poor ground connections.
• Interference from aftermarket devices.
• Damaged or shorted communication lines.
• Low battery voltage or power supply issues.

Common misdiagnosis for U1572 U1572: “Vehicle Communication Network Malfunction”

• Faulty wiring or connectors
• Defective control modules
• Incorrectly programmed modules
• Battery or power supply issues
• Faulty sensors
• Software glitches
• Grounding issues
• Intermittent communication faults

Common Troubleshooting Steps

The OBD-II code U1572 indicates a “Vehicle Communication Network Malfunction.” This code typically points to issues with the 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 additional trouble codes. Sometimes, other codes can provide context or lead to the root cause of the problem.
• Inspect Wiring and Connectors:
• Visually inspect the wiring and connectors associated with the communication network. Look for damaged, frayed, or corroded wires and loose connections.
• Pay special attention to the connectors on the modules involved in the communication network.
• Check for Short Circuits:
• Use a multimeter to check for short circuits in the wiring harness. Ensure that there are no unintended connections between wires that could disrupt communication.
• Test Modules:
• If you suspect a specific module (like the Body Control Module, Engine Control Module, etc.) is causing the issue, you can test it for proper operation. This may involve checking power and ground connections, as well as communication signals.
• Inspect the CAN Bus:
• The Controller Area Network (CAN) bus is responsible for communication between modules. Check for proper voltage levels on the CAN bus wires. Typically, you should see around 2.5V on the CAN High and CAN Low lines when the vehicle is on.
• Check for Interference:
• Look for any aftermarket devices or modifications that may interfere with the vehicle’s communication network. This includes alarm systems, stereo systems, or other electronic devices.
• Update Software/Firmware:
• Sometimes, a software update for the vehicle’s modules can resolve communication issues. Check with the manufacturer or a dealership for any available updates.
• Perform a Hard Reset:
• Disconnect the vehicle’s battery for a few minutes to reset the modules. Reconnect the battery and see if the code reappears.
• Consult Technical Service Bulletins (TSBs):
• Check for any TSBs related to the U1572 code for your specific vehicle make and model. Manufacturers may have identified common issues and solutions.
• Professional Diagnosis:
• If the issue persists after performing the above steps, it may be necessary to seek help from a professional mechanic or dealership. They have specialized tools and knowledge to diagnose complex communication issues. By following these steps, you can systematically identify and address the underlying cause of the U1572 code.