U1579 – Invalid Data Received from Vehicle Communication Bus.

The ODBII code U1579 indicates that the vehicle’s communication bus has received invalid data, suggesting a problem with data transmission between modules.

The severity of ODBII code U1579 is generally considered moderate.

Common Causes For: U1578 U1578: “Vehicle Communication Bus Malfunction”

• Faulty wiring or connectors in the communication bus.
• Malfunctioning control modules.
• Corrupted or incompatible software in the control modules.
• Poor ground connections.
• Interference from aftermarket devices or modifications.
• Low battery voltage or power supply issues.
• Faulty or damaged OBD-II port.

Common misdiagnosis for U1579 Invalid Data Received from Vehicle Communication Bus.

• Faulty OBDII connector
• Bad ground connections
• Malfunctioning ECU
• Wiring issues
• Faulty sensors
• Communication module failure
• Software glitches in the vehicle’s systems
• Incorrectly configured aftermarket devices

Common Troubleshooting Steps

The OBD-II code U1579 indicates that there is invalid data being received from the vehicle communication bus. This can be caused by various issues, including problems with the vehicle’s wiring, modules, or communication protocols. Here are some common troubleshooting steps to help diagnose and resolve the 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 related to the communication bus (CAN bus). Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the connectors of the modules involved in the communication.
• Check for Short Circuits or Open Circuits:
• Use a multimeter to check for continuity in the communication lines. Look for any short circuits or open circuits that could be affecting communication.
• Verify Module Functionality:
• Ensure that all modules on the communication bus are functioning correctly. If a specific module is malfunctioning, it may send invalid data.
• If possible, perform a module reset or reprogramming if the module supports it.
• Inspect the CAN Bus:
• Use an oscilloscope or a CAN bus analyzer to monitor the data on the CAN bus. Look for irregularities in the signal, such as noise or incorrect voltage levels.
• Check the termination resistors at both ends of the CAN bus to ensure they are present and functioning correctly.
• Check for Software Updates:
• Verify if there are any software updates available for the vehicle’s modules. Sometimes, manufacturers release updates to fix communication issues.
• Battery and Ground Connections:
• Ensure that the vehicle’s battery is in good condition and that all ground connections are secure. Poor power supply or grounding can lead to communication issues.
• Clear Codes and Test Drive:
• After performing any repairs or adjustments, clear the trouble codes 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 specific make and model of the vehicle. Manufacturers may have documented solutions for known issues.
• Professional Diagnosis:
• If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership with experience in diagnosing communication issues. By following these steps, you should be able to identify and resolve the underlying cause of the U1579 code.