U1953 – Module Communication Failure

The ODBII code U1953 indicates a “Module Communication Failure,” meaning there is a problem with communication between vehicle modules, often due to a fault in the wiring, connectors, or the modules themselves.

The severity of ODBII code U1953 is moderate.

Common Causes For: U1952 U1952: “Data Bus Communication Failure”

• Faulty wiring or connectors
• Failed or malfunctioning control module
• Corrupted software or firmware in the module
• Poor ground connections
• Intermittent electrical issues
• Communication network issues (e.g., CAN bus problems)
• Low battery voltage or power supply issues
• Damaged or corroded pins in connectors
• Incompatible or missing modules in the network

Common misdiagnosis for U1953 U1953: “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 U1953 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 module(s). 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 Power Supply: Ensure that the affected module is receiving the proper voltage and ground. Use a multimeter to check the power and ground circuits.
• Test the 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.
• Check for Intermittent Issues: Sometimes, communication failures can be intermittent. Wiggle the wiring harnesses and connectors while monitoring the communication to see if the issue can be replicated.
• Inspect the CAN Bus: If the vehicle uses a Controller Area Network (CAN) bus for communication, check the integrity of the CAN bus wiring. Look for shorts, opens, or high resistance in the bus lines.
• Scan for Communication Issues: Use a professional-grade scan tool to monitor the communication between modules. This can help identify which module is not communicating properly.
• Update Software/Firmware: In some cases, a software update for the vehicle’s modules may resolve communication issues. Check with the manufacturer for any available updates.
• Reset the Modules: Sometimes, resetting the modules by disconnecting the battery for a few minutes can clear temporary communication issues.
• 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. 1
• 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 can systematically identify and resolve the underlying cause of the U1953 code.