U1533 – Module Communication Failure

The ODBII code U1533 indicates a “Module Communication Failure,” meaning there is a problem with communication between the vehicle’s control modules, often due to a fault in the wiring, connectors, or the modules themselves.

The severity of ODBII code U1533 is moderate.

Common Causes For: U1532 U1532: “Module Communication Failure”

• Faulty wiring or connectors
• Failed or malfunctioning module
• Corroded or damaged pins
• Poor ground connections
• Intermittent electrical issues
• Software or firmware issues
• Low battery voltage or weak battery
• Communication network issues (e.g., CAN bus problems)

Common misdiagnosis for U1533 U1533: “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 U1533 indicates a “Module Communication Failure,” which typically means that there is a problem with communication between various control modules in the vehicle. 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 additional trouble codes. Sometimes, other codes can provide context or lead to the root cause of the communication failure.
• 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 ground connections, as poor grounding can lead to communication issues.
• Check Power Supply: Ensure that the affected modules are receiving the proper voltage. Use a multimeter to check the power supply to the modules.
• Test Communication Lines:
• Use a scan tool to check the communication lines (CAN bus, LIN bus, etc.) for continuity and proper voltage levels.
• If you have access to an oscilloscope, you can check the signal waveforms on the communication lines to ensure they are functioning correctly.
• Inspect Modules:
• If possible, check the affected modules for any signs of physical damage or water intrusion.
• If you suspect a specific module is faulty, you may consider swapping it with a known good module to see if the issue resolves.
• Reset Modules: Sometimes, resetting the modules can clear temporary communication issues. Disconnect the battery for a few minutes or use a scan tool to clear the codes and see if they return.
• Check for Software Updates: Ensure that the vehicle’s control modules have the latest software updates. Sometimes, manufacturers release updates to fix communication issues.
• Look for Intermittent Issues: If the problem is intermittent, try to replicate the conditions under which the code appears. This can help identify specific triggers for the communication failure.
• Consult Wiring Diagrams: Refer to the vehicle’s service manual for wiring diagrams and communication protocols. This can help you trace the communication lines and identify potential issues.
• Professional Diagnosis: If the issue persists after performing the above steps, it may be necessary to consult a professional technician or dealership with advanced diagnostic tools to further investigate the problem. By following these steps, you can systematically diagnose and potentially resolve the U1533 code and the underlying communication issues in your vehicle.