U2717 – Control Module Communication Bus Off.

The ODBII code U2717 indicates a communication issue where a control module is unable to communicate over the vehicle’s communication bus, often due to a fault in the module or wiring.

The severity of ODBII code U2717 is moderate to severe.

Common Causes For: U2716 U2716: Transmission Control Module Communication Error

• Faulty control module
• Damaged wiring or connectors
• Poor ground connections
• Communication bus interference
• Software issues or bugs
• Low battery voltage
• Faulty or disconnected sensors
• Corroded terminals or connectors

Common misdiagnosis for U2717 Control Module Communication Bus Off.

• Faulty control module
• Wiring issues
• Poor ground connections
• Corrupted software/firmware
• Faulty sensors
• Battery or power supply problems
• Communication network issues
• Incorrectly installed aftermarket components

Common Troubleshooting Steps

The OBD-II code U2717 indicates a communication issue with the control module, specifically that the communication bus is “off.” This can be caused by various factors, including wiring issues, module failures, or problems with the communication network. Here are some common troubleshooting steps to diagnose and resolve the U2717 code:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context about the issue.
• Inspect Wiring and Connectors: Visually inspect the wiring and connectors related to the control module and communication bus. 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 the Control Module: Ensure that the control module is properly connected and functioning. If possible, test the module in another vehicle to confirm its operation.
• If the module is suspected to be faulty, consider replacing it.
• Test the Communication Bus: Use a multimeter or an oscilloscope to check the voltage levels and signals on the communication bus (CAN bus, LIN bus, etc.).
• Look for any short circuits or open circuits in the communication lines.
• Inspect for Interference: Check for any aftermarket devices or modifications that may interfere with the communication bus. This includes alarms, stereo systems, or other electronic devices.
• Check for Software Updates: Verify if there are any software updates available for the control module. Sometimes, manufacturers release updates to fix communication issues.
• Perform a Hard Reset: Disconnect the vehicle’s battery for a few minutes to reset the control modules. Reconnect the battery and see if the code reappears.
• Scan for Communication Issues: Use a professional-grade scan tool to perform a network scan. This can help identify which module(s) are not communicating properly.
• Consult Wiring Diagrams: Refer to the vehicle’s service manual for wiring diagrams to trace the communication lines and identify any potential issues.
• Seek Professional Help: If the issue persists after performing the above steps, consider seeking help from a qualified technician or automotive electrician who has experience with OBD-II systems.Conclusion Troubleshooting OBD-II code U2717 requires a systematic approach to identify the root cause of the communication issue. By following these steps, you can narrow down the problem and take appropriate action to resolve it.