U1108 – SCP (J1850) Invalid or Missing Data for Electric Traction Drive (Inverter)

The ODBII code U1108 SCP (J1850) indicates that there is invalid or missing data related to the electric traction drive (inverter) in a vehicle’s communication network.

The severity of ODBII code U1108 is typically considered moderate to severe.

Common Causes For: U1107 U1107: “Control Module Communication Failure”

• Faulty electric traction drive inverter
• Poor electrical connections or wiring issues
• Corrupted or missing data in the vehicle’s communication network
• Malfunctioning sensors related to the traction drive
• Issues with the vehicle’s control module
• Software glitches or outdated firmware
• Interference from other electronic components in the vehicle
• Grounding issues in the electrical system

Common misdiagnosis for U1108 SCP (J1850) Invalid or Missing Data for Electric Traction Drive (Inverter)

• Faulty inverter
• Bad wiring or connectors
• Defective battery management system
• Malfunctioning electric motor
• Software issues or updates needed
• Faulty sensors related to the traction drive
• Issues with the vehicle’s control module
• Grounding problems
• Corrupted data communication lines
• Low battery voltage or power supply issues

Common Troubleshooting Steps

When dealing with OBD-II code U1108, which indicates “Invalid or Missing Data for Electric Traction Drive (Inverter)” on vehicles that use the SCP (J1850) communication protocol, there are several common troubleshooting steps you can take to diagnose and potentially resolve the issue. Here’s a structured approach:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. Addressing related codes can help in diagnosing the root cause.
• Inspect Wiring and Connectors: **Visual Inspection: Look for damaged, frayed, or corroded wiring and connectors related to the electric traction drive and inverter.
• **Connector Integrity: Ensure that all connectors are securely attached and free of corrosion or dirt.
• Check Power and Ground: Verify that the electric traction drive and inverter are receiving proper power and ground. Use a multimeter to check voltage at the connectors.
• Ensure that the ground connections are clean and secure.
• Inspect the Inverter and Traction Drive: Check the inverter for any signs of physical damage or overheating.
• Ensure that the inverter is functioning correctly and that there are no internal faults.
• Test Communication Lines: Use a scan tool to monitor the communication between the inverter and the vehicle’s control modules. Look for any interruptions or irregularities in data transmission.
• Check the SCP (J1850) communication lines for shorts, opens, or interference.
• Check for Software Updates: Verify if there are any software updates available for the vehicle’s control modules. Sometimes, manufacturers release updates to fix known issues.
• Perform a System Reset: Clear the trouble codes using the OBD-II scanner and see if the code returns after a test drive. This can sometimes reset temporary issues.
• Inspect Related Components: Check other components that may affect the inverter operation, such as the battery management system, motor control module, and any associated sensors.
• Consult Technical Service Bulletins (TSBs): Look for any TSBs related to the U1108 code or the electric traction drive system for your specific vehicle make and model. Manufacturers may have documented fixes for known issues.
• Professional Diagnosis: If the issue persists after performing the above steps, consider seeking help from a professional technician or dealership. They may have specialized diagnostic tools and experience with your vehicle.Conclusion Troubleshooting OBD-II code U1108 involves a systematic approach to check for electrical issues, communication problems, and component failures. By following these steps, you can narrow down the potential causes and work towards a resolution.