U1536 – Module Communication Failure

The ODBII code U1536 indicates a “Module Communication Failure,” meaning there is a problem with communication between vehicle modules, often due to a fault in wiring, connectors, or the modules themselves.

The severity of ODBII code U1536 is moderate.

Common Causes For: U1535 U1535: “Module Communication Failure”

• Faulty wiring or connectors
• Failed or malfunctioning module
• Corrupted software or firmware
• Poor ground connections
• Interference from aftermarket devices
• Low battery voltage
• Communication network issues (e.g., CAN bus problems)

Common misdiagnosis for U1536 U1536: “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 U1536 indicates a “Module Communication Failure,” which typically means that there is a problem with communication between various modules in the vehicle’s network. 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 modules. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the ground connections, as poor grounding can lead to communication issues.
• Check Module Power Supply: Ensure that the affected module(s) are receiving the proper voltage and ground. Use a multimeter to check the power supply to the module.
• Test the Affected Module: If you can identify which module is having communication issues, you may need to test or replace it. This can involve:
• Checking the module’s functionality with a scan tool.
• Performing a reset or reprogramming if necessary.
• Inspect the CAN Bus:
• The Controller Area Network (CAN) bus is responsible for communication between modules. Check for any shorts, opens, or faults in the CAN wiring.
• Use an oscilloscope or a CAN bus tester to monitor the communication signals on the bus.
• Check for Interference: Sometimes, aftermarket accessories or modifications can interfere with module communication. If any recent changes have been made to the vehicle, consider removing them temporarily to see if the issue resolves.
• Perform a Hard Reset: Disconnect the vehicle’s battery for a few minutes to reset the modules. Reconnect the battery and see if the code reappears.
• Update Software/Firmware: In some cases, a software update for the affected module(s) may be necessary. Check with the manufacturer for any available updates.
• Consult Technical Service Bulletins (TSBs): Look for any TSBs related to the specific make and model of your vehicle. Manufacturers may have issued guidance on known communication issues.
• Seek Professional Help: If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or dealership with advanced diagnostic tools. By following these steps, you can systematically identify and address the root cause of the U1536 code.