U1534 – Module Communication Failure

The ODBII code U1534 indicates a “Module Communication Failure,” meaning there is a problem with communication between the vehicle’s control modules, often due to a wiring issue, a faulty module, or a network problem.

The severity of ODBII code U1534 is moderate.

Common Causes For: U1533 U1533: “Module Communication Failure”

• Faulty wiring or connectors
• Failed or malfunctioning module
• Corrupted software or firmware in the module
• Poor ground connections
• Intermittent electrical issues
• Low battery voltage or weak battery
• Communication network issues (e.g., CAN bus problems)
• Water intrusion or corrosion in connectors
• Improperly installed aftermarket accessories
• Faulty or damaged sensors

Common misdiagnosis for U1534 U1534: “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 U1534 indicates a “Module Communication Failure,” which typically means that there is a communication issue between the vehicle’s control modules. 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:
• Visually inspect the wiring and connectors associated with the affected module(s). Look for signs of damage, corrosion, or loose connections.
• Pay special attention to ground connections, as poor grounding can lead to communication issues.
• Check Power Supply:
• Ensure that the affected module is receiving the proper voltage. Use a multimeter to check the power supply to the module.
• Verify that the fuses related to the module are intact and functioning.
• Test the Module:
• If possible, test the affected module by swapping it with a known good module (if applicable) to see if the problem persists.
• Some modules may have self-diagnostic capabilities; check for any internal fault codes.
• Inspect the CAN Bus:
• If the vehicle uses a Controller Area Network (CAN) bus, check for issues on the bus. This may involve using a CAN bus scanner to monitor communication between modules.
• Look for short circuits, open circuits, or any other anomalies in the CAN wiring.
• Check for Interference:
• Ensure that there are no aftermarket devices or modifications that could be interfering with module communication.
• Remove any non-factory accessories that may be connected to the vehicle’s electrical system.
• Update Software/Firmware:
• Check if there are any software updates available for the vehicle’s modules. Sometimes, communication issues can be resolved with a software 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 U1534 code and the affected module(s).
• Seek Professional Help:
• If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or dealership for further diagnosis and repair. By following these steps, you can systematically identify and resolve the underlying cause of the U1534 code.