U1336 – Manufacturer Specific code, which typically indicates an issue related to the communication between modules in the vehicle’s network.

The ODBII code U1336 indicates a communication issue between modules in the vehicle’s network, often related to a fault in the data bus or a specific module’s failure to communicate properly.

The severity of ODBII code U1336 is generally considered moderate to severe, as it indicates a communication issue between vehicle modules that can affect vehicle performance and functionality.

Common Causes For: U1334 Invalid Data Received from Vehicle Speed Control Module.

• Faulty wiring or connectors in the communication network.
• Malfunctioning control modules.
• Corrupted software or firmware in one or more modules.
• Poor ground connections.
• Interference from aftermarket accessories.
• Low battery voltage or weak battery.
• Faulty or damaged CAN bus.

Common misdiagnosis for U1336 Manufacturer Specific” code, which typically indicates an issue related to the communication between modules in the vehicle’s network.

• Faulty wiring or connectors
• Defective control modules
• Battery or charging system issues
• Software glitches or outdated firmware
• Grounding problems
• Intermittent electrical connections
• Faulty sensors unrelated to communication
• Incorrectly installed aftermarket accessories
• Corrupted data in the vehicle’s network
• Issues with the OBDII scanner or diagnostic tool

Common Troubleshooting Steps

The OBD-II code U1336 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 U1336 code.
• Inspect Wiring and Connectors: **Visual Inspection: Check the wiring and connectors related to the modules involved in the communication. Look for signs of damage, corrosion, or loose connections.
• **Repair or Replace: Repair any damaged wires or connectors and ensure all connections are secure.
• Check Module Functionality: **Module Status: Verify that all modules in the vehicle are functioning correctly. If a specific module is malfunctioning, it may cause communication issues.
• **Reprogram or Replace: If a module is found to be faulty, consider reprogramming or replacing it.
• Inspect the CAN Bus: **CAN Bus Integrity: Check the integrity of the Controller Area Network (CAN) bus. Look for shorts, opens, or high resistance in the bus lines.
• **Termination Resistors: Ensure that the termination resistors at both ends of the CAN bus are present and functioning correctly.
• Check Power and Ground: **Power Supply: Verify that all modules have the correct power supply. Use a multimeter to check voltage levels.
• **Ground Connections: Ensure that all ground connections are clean and secure.
• Perform a Network Test: Use a scan tool capable of performing a network test to check for communication between modules. This can help identify which module is not communicating properly.
• Clear Codes and Test Drive: After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner.
• Take the vehicle for a test drive to see if the code reappears.
• Consult Manufacturer Documentation: Refer to the vehicle’s service manual or manufacturer-specific documentation for any additional troubleshooting steps or specific procedures related to the U1336 code.
• Seek Professional Help: If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership with experience in diagnosing communication issues in your specific vehicle make and model. By following these steps, you can systematically diagnose and potentially resolve the issue related to the U1336 OBD-II code.