U1345 – Manufacturer Specific code, which typically indicates a communication issue between modules in the vehicle’s network.

The ODBII code U1345 indicates a communication issue between modules in the vehicle’s network, often related to a failure in data exchange or a malfunction in one of the control modules.

The severity of ODBII code U1345 is generally considered moderate to severe, as it indicates a communication issue between modules that can affect vehicle performance and functionality.

Common Causes For: U1343 Manufacturer Specific” code, which typically indicates a communication issue between modules in the vehicle’s network.

• Faulty wiring or connectors
• Malfunctioning control module
• Corroded or damaged pins
• Poor ground connections
• Intermittent electrical issues
• Software glitches or outdated firmware
• Faulty sensors affecting communication
• Battery or power supply issues
• Aftermarket modifications or installations
• Water intrusion or moisture damage

Common misdiagnosis for U1345 Manufacturer Specific” code, which typically indicates a communication issue between modules in the vehicle’s network.

• Faulty wiring or connectors
• Defective control module
• Software issues or outdated firmware
• Battery or power supply problems
• Grounding issues
• Intermittent faults in the communication network
• Incorrectly installed aftermarket accessories
• Corrupted data or configuration settings
• Faulty sensors or actuators
• Other unrelated DTCs leading to confusion

Common Troubleshooting Steps

The OBD-II code U1345 is a manufacturer-specific code that generally indicates a communication issue between modules in a vehicle’s network. 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. Addressing other codes may resolve the U1345 code.
• Inspect Wiring and Connectors: **Visual Inspection: Check the wiring and connectors related to the modules involved. Look for frayed wires, corrosion, or loose connections.
• **Repair or Replace: Repair any damaged wiring or connectors as necessary.
• Check Module Communication: **Network Scan: Use a scan tool to check the communication status of all modules in the vehicle. Ensure that all modules are responding.
• **Module Functionality: If a specific module is not communicating, it may be faulty and require replacement.
• Inspect Ground Connections: Ensure that all ground connections for the modules are secure and free of corrosion. Poor ground connections can lead to communication issues.
• Check Power Supply: Verify that the affected modules are receiving the correct voltage. Use a multimeter to check the power supply to the modules.
• Reset the Codes: Clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns. Sometimes, a temporary glitch can cause communication issues.
• Update Software/Firmware: Check if there are any software updates available for the vehicle’s modules. Sometimes, manufacturers release updates to fix communication issues.
• Perform a Network Test: If available, use a professional-grade scan tool to perform a network test. This can help identify communication faults between specific modules.
• Check for Interference: Ensure that there are no aftermarket devices (like alarms, radios, etc.) that could be interfering with the vehicle’s communication network.
• Consult Service Manual: Refer to the vehicle’s service manual for specific diagnostic procedures related to the U1345 code. Manufacturer-specific guidelines can provide additional insights.1
• Seek Professional Help: If the issue persists after performing the above steps, consider consulting a professional mechanic or dealership. They may have access to specialized diagnostic tools and knowledge of manufacturer-specific issues. By following these steps, you can systematically diagnose and potentially resolve the U1345 code related to communication issues in your vehicle’s network.