U1343 – Manufacturer Specific code, which typically indicates a communication issue between modules in the vehicle’s network.

The ODBII code U1343 indicates a communication issue between modules in the vehicle’s network, often related to a specific manufacturer’s diagnostic system.

The severity of ODBII code U1343 is generally considered moderate to severe, as it indicates a communication issue between modules that can affect vehicle performance and functionality.

Common Causes For: U1341 SCP (J1850) Invalid or Missing Data for Function Read Vehicle Speed

• Faulty wiring or connectors
• Malfunctioning control module
• Corrupted software or firmware
• Poor ground connections
• Intermittent electrical issues
• Short circuits in the communication lines
• Faulty or damaged sensors
• Issues with the vehicle’s battery or charging system
• Aftermarket modifications or installations affecting communication
• Environmental factors (moisture, corrosion) affecting connections

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

• Faulty wiring or connectors
• Defective control module
• Corrupted software or firmware
• Power supply issues
• Grounding problems
• Intermittent communication faults
• Incorrectly installed aftermarket components
• Low battery voltage
• Faulty sensors
• Issues with the vehicle’s CAN bus system

Common Troubleshooting Steps

The OBD-II code U1343 is a manufacturer-specific code that typically indicates a communication issue between modules in the 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. Sometimes, multiple codes can provide more context about 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 ground connections, as poor grounding can lead to communication issues.
• Check Module Functionality:
• Identify the specific module(s) that are having communication issues. This may require consulting the vehicle’s service manual or wiring diagrams.
• If possible, test the functionality of the affected module(s) to ensure they are operating correctly.
• Perform a Network Scan:
• Use a professional-grade scan tool to perform a network scan. This can help identify which modules are not communicating properly.
• Check for any communication errors or faults in the CAN (Controller Area Network) bus.
• Inspect the CAN Bus:
• If the vehicle uses a CAN bus system, check the bus for continuity and proper voltage levels.
• Look for short circuits or open circuits in the CAN wiring.
• Check for Software Updates:
• Some communication issues can be resolved with software updates. Check with the manufacturer for any available updates for the affected modules.
• Reset the Modules:
• Sometimes, resetting the affected modules can clear temporary communication faults. This can be done by disconnecting the battery for a few minutes or using a scan tool to clear the codes.
• Test the Battery and Charging System:
• Ensure that the vehicle’s battery and charging system are functioning properly. Low voltage can cause communication issues between modules.
• Consult Technical Service Bulletins (TSBs):
• Check for any TSBs related to the U1343 code for your specific vehicle make and model. Manufacturers may have specific recommendations for addressing this code.
• Seek Professional Help:
• If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or dealership with experience in diagnosing communication issues in your specific vehicle. By following these troubleshooting steps, you can systematically identify and resolve the underlying cause of the U1343 code.