U1767 – Data Bus Communication Fault

The ODBII code U1767: Data Bus Communication Fault indicates a problem with communication between modules on the vehicle’s data bus, which may affect the operation of various electronic systems.

The severity of ODBII code U1767 is moderate.

Common Causes For: U1765 U1765: “Module Communication Failure”

• 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 U1767 U1767: Data Bus Communication Fault

• Faulty wiring or connectors
• Defective control modules
• Battery or charging system issues
• Software glitches or outdated firmware
• Intermittent electrical connections
• Grounding issues
• Faulty sensors or actuators
• Communication protocol mismatches

Common Troubleshooting Steps

The OBD-II code U1767 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: **Visual Inspection: Check the wiring and connectors related to the data bus (CAN bus, LIN bus, etc.) for any signs of damage, corrosion, or loose connections.
• **Repair or Replace: Repair any damaged wires or connectors and ensure all connections are secure.
• Check for Short Circuits: Use a multimeter to check for short circuits in the wiring harness. Look for continuity between wires that should not be connected.
• Test Modules: **Module Functionality: Verify that all modules on the data bus are functioning correctly. A malfunctioning module can disrupt communication.
• **Disconnect Modules: If possible, disconnect modules one at a time to see if the code clears or if communication is restored.
• Inspect the Data Bus: **Signal Integrity: Use an oscilloscope to check the signal integrity on the data bus. Look for any irregularities in the signal that could indicate a problem.
• **Termination Resistors: Ensure that the termination resistors are present and functioning correctly at both ends of the data bus.
• Check Power and Ground: Ensure that all modules on the data bus have proper power and ground connections. A lack of power or a poor ground can cause communication issues.
• Update Software/Firmware: Check if there are any software or firmware updates available for the vehicle’s modules. Sometimes, communication issues can be resolved with an update.
• Clear Codes and Test Drive: After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner 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 U1767 code and the data bus system.
• Seek Professional Help: If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific vehicle make and model. By following these troubleshooting steps, you can systematically identify and resolve the underlying issue causing the U1767 code.