U1828 – Network Communication Line Fault

The ODBII code U1828 indicates a fault in the network communication line, suggesting a problem with the data transmission between modules in the vehicle’s communication network.

The severity of ODBII code U1828 is moderate.

Common Causes For: U1827 U1827: “Module Communication Failure”

• Faulty wiring or connectors
• Short circuits in the communication line
• Open circuits in the communication line
• Malfunctioning control modules
• Corroded or damaged terminals
• Poor ground connections
• Interference from aftermarket devices
• Software issues or bugs in the control modules
• Faulty or damaged communication network components (e.g., CAN bus)

Common misdiagnosis for U1828 U1828: “Network Communication Line Fault”

• Faulty wiring or connectors
• Defective control modules
• Poor ground connections
• Intermittent communication issues
• Software glitches or updates needed
• Battery or power supply issues
• Faulty sensors or actuators
• Corroded terminals or connectors

Common Troubleshooting Steps

The OBD-II code U1828 indicates a “Network Communication Line Fault.” This code typically points to a problem with the communication between various modules in the vehicle’s network, such as the CAN (Controller Area Network) bus. Here are some common troubleshooting steps to diagnose and resolve the issue:

• Check for Additional 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 communication network. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the connectors at the modules involved in the communication network.
• Test the Communication Network: Use a multimeter or an oscilloscope to test the voltage and signal integrity on the CAN bus lines. Ensure that the voltage levels are within the expected range.
• Check for short circuits or open circuits in the wiring.
• Check for Module Malfunction: Identify which module(s) are involved in the communication network. If a specific module is malfunctioning, it may need to be repaired or replaced.
• Disconnect the suspected module and see if the code clears or if the communication improves.
• Inspect 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 modules are communicating properly and which are not.
• Check for Ground Issues: Ensure that all ground connections related to the communication network are secure and free of corrosion. Poor grounding can lead to communication issues.
• Update Software/Firmware: Check if there are any software or firmware updates available for the vehicle’s modules. Sometimes, updating the software can resolve communication issues.
• Clear Codes and Test Drive: After performing the above checks and repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns.
• Consult Service Manual: Refer to the vehicle’s service manual for specific diagnostic procedures related to the U1828 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 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 issue causing the U1828 code.