U1768 – Data Bus Communication Fault

The ODBII code U1768: Data Bus Communication Fault indicates a problem with the communication between modules on the vehicle’s data bus, which may affect the operation of various electronic systems.

The severity of ODBII code U1768 is moderate.

Common Causes For: U1767 U1767: Data Bus Communication Fault

• Faulty wiring or connectors in the data bus system.
• Malfunctioning control modules.
• Poor ground connections.
• Interference from aftermarket devices.
• Corroded or damaged pins in connectors.
• Software issues or bugs in the control modules.
• Low battery voltage or power supply issues.
• Faulty or damaged data bus transceiver.

Common misdiagnosis for U1768 U1768: Data Bus Communication Fault

• Faulty ABS module
• Defective engine control module (ECM)
• Malfunctioning transmission control module (TCM)
• Bad wiring or connectors
• Faulty body control module (BCM)
• Issues with the CAN bus system
• Defective sensors or actuators
• Power supply problems
• Grounding issues
• Software glitches or updates needed

Common Troubleshooting Steps

The OBD-II code U1768 indicates a “Data Bus Communication Fault.” 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 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 related to the data bus. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the connectors for the modules involved in the communication network.
• Check for Short Circuits or Open Circuits: Use a multimeter to check for continuity in the data bus wiring. Look for any short circuits or open circuits that could disrupt communication.
• Test the Modules: Identify the modules that are part of the data bus (e.g., Engine Control Module, Transmission Control Module, Body Control Module).
• Check if the modules are functioning properly. You may need to perform a module reset or reprogramming if necessary.
• Inspect the Data Bus: Use an oscilloscope or a specialized scan tool to monitor the data bus signals. Look for irregularities in the communication signals.
• Check for proper voltage levels on the data bus lines.
• Check for Interference: Ensure that there are no aftermarket devices or modifications that could be interfering with the data bus communication.
• Battery and Ground Connections: Check the vehicle’s battery and ground connections. Poor grounding can lead to communication issues.
• Ensure that the battery is fully charged and in good condition.
• Clear Codes and Test Drive: After performing the checks and repairs, clear the trouble codes using the OBD-II scanner.
• Take the vehicle for a test drive to see if the code reappears.
• Consult Technical Service Bulletins (TSBs): Check for any manufacturer-specific TSBs related to the U1768 code. There may be known issues or recalls that could provide additional guidance.
• Professional Diagnosis: If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have access to advanced diagnostic tools and resources. By following these steps, you should be able to identify and resolve the underlying issue causing the U1768 code.