U2317 – Control Module Communication Bus Off.

The ODBII code U2317 indicates a communication issue where a control module is not able to communicate on the vehicle’s communication bus, often due to a fault in the module or wiring.

The severity of ODBII code U2317 is moderate to severe.

Common Causes For: U2316 Lost Communication with the Battery Energy Control Module (BECM)”.

• Faulty control module
• Poor electrical connections or wiring issues
• Short circuits in the communication lines
• Corroded connectors
• Faulty or damaged CAN bus
• Software or firmware issues in the control module
• Low battery voltage or power supply issues
• Interference from aftermarket devices or modifications

Common misdiagnosis for U2317 Control Module Communication Bus Off.

• Faulty control module
• Wiring issues
• Poor ground connections
• Corroded connectors
• Battery or power supply problems
• Software or firmware issues
• Other communication bus faults
• Sensor malfunctions

Common Troubleshooting Steps

The OBD-II code U2317 indicates a communication issue on the control module communication bus, specifically that one or more modules are not communicating properly. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check for Other Codes: Start by scanning the vehicle for any other diagnostic trouble codes (DTCs). Other codes may provide additional context or indicate which module is having issues.
• Inspect Wiring and Connectors:
• Visually inspect the wiring and connectors associated with the control modules. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the wiring harnesses that connect to the affected modules.
• Check Power and Ground:
• Ensure that the affected control modules are receiving proper power and ground. Use a multimeter to check voltage and ground continuity.
• Refer to the vehicle’s wiring diagram to identify the correct power and ground pins for the modules.
• Test the Communication Bus:
• Use a scan tool to monitor the communication on the CAN bus (Controller Area Network). Check for any irregularities in the data being transmitted.
• If possible, use an oscilloscope to analyze the signal on the bus for any abnormalities.
• Disconnect Modules:
• If multiple modules are connected to the same communication bus, try disconnecting them one at a time to isolate the faulty module.
• After disconnecting a module, check if the code persists. If the code clears after disconnecting a specific module, that module may be the source of the problem.
• Check for Short Circuits:
• Inspect the wiring for any short circuits or open circuits that could be affecting communication.
• Use a multimeter to check for continuity and resistance in the communication lines.
• Update or Reprogram Modules:
• In some cases, a software update or reprogramming of the affected control module may be necessary. Check with the manufacturer for any available updates.
• Replace Faulty Modules:
• If a specific module is determined to be faulty after testing, it may need to be replaced. Ensure that the replacement module is compatible with the vehicle.
• Clear Codes and Test Drive:
• After performing repairs, clear the codes using a scan tool and take the vehicle for a test drive to see if the code returns.
• Consult Technical Service Bulletins (TSBs):
• Check for any TSBs related to the U2317 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues. If the problem persists after following these steps, it may be beneficial to consult a professional technician or a dealership for further diagnosis.