U1824 – Module Communication Failure

The ODBII code U1824 indicates a communication failure between modules in a vehicle’s network, suggesting that one or more control modules are unable to communicate with each other properly.

The severity of ODBII code U1824 is moderate.

Common Causes For: U1823 U1823: “Module Communication Failure”

• Faulty wiring or connectors
• Failed control module
• Corrupted software or firmware
• Poor ground connections
• Intermittent electrical issues
• Communication network issues (e.g., CAN bus problems)
• Low battery voltage or power supply issues
• Damaged or shorted circuits

Common misdiagnosis for U1824 U1824: “Module Communication Failure”

• Faulty wiring or connectors
• Defective control module
• Software issues or updates needed
• Battery or power supply problems
• Grounding issues
• Intermittent communication issues
• Other communication protocol failures

Common Troubleshooting Steps

The OBD-II code U1824 indicates a “Module Communication Failure,” which typically means that there is a problem with communication between the vehicle’s control modules. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check for Other 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 affected modules. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the wiring harnesses that connect the modules, as these can be prone to wear and tear.
• Check Power and Ground:
• Ensure that the affected module has a proper power supply and ground connection. Use a multimeter to check voltage and ground continuity.
• If the module is not receiving power or ground, trace the wiring back to the source to identify any issues.
• Test the Affected Module:
• If possible, test the affected module to ensure it is functioning correctly. This may involve bench testing or swapping with a known good module.
• If the module is faulty, it may need to be repaired or replaced.
• Inspect the CAN Bus:
• The Controller Area Network (CAN) bus is responsible for communication between modules. Check for any issues with the CAN bus wiring, such as shorts or opens.
• Use a CAN bus scanner to monitor the communication and check for any abnormalities.
• Check for Interference:
• Look for any aftermarket devices or modifications that may interfere with module communication. This includes alarm systems, stereo systems, or other electronic devices.
• Perform a Network Test:
• Some advanced scan tools can perform a network test to check the communication between modules. This can help identify which module is not communicating properly.
• Reset the Modules:
• Sometimes, resetting the modules can resolve communication issues. Disconnect the battery for a few minutes or use a scan tool to clear the codes and reset the modules.
• Consult Technical Service Bulletins (TSBs):
• Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common communication issues.
• 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 and its systems. By following these troubleshooting steps, you can systematically identify and resolve the underlying cause of the U1824 code.