Error Code During ECU Upgrade (7000-31-7F10)

Symptom

The ECU upgrade stops almost immediately at 0–5%, and error code “7000-31-7F10” is displayed on the screen.

Cause

• During an ECU upgrade using the Ethernet protocol, a response was requested from the ECU during the EraseMemory stage (0–5%) or the CheckDependencies stage (99%), but the ECU returned a negative response.
• A temporary communication failure occurred in the Ethernet connection between the tablet, VCI, and vehicle, such as a loose cable connection, IP address mismatch, or ECU internal processing delay.

Resolution (When a Vehicle-to-Diagnostic Equipment Communication Failure Occurs)

If “7000-31-7F10” occurs during a DCU-related update, contact the Vehicle Quality Department or the controller manufacturer. 

Step 1) Check the Vehicle Power Status

Verify that the vehicle is IG On (engine OFF).
If the battery voltage is low, use an external power supply such as a battery maintainer.

Step 2) Check the Ethernet Communication Path

1) Check the VCI2 and ECI or VCI3 indicator light. It must be green.
2) Firmly reconnect all cables (tablet ↔ VCI ↔ OBD).
3) Check the static IP configuration in the tablet network settings. 
   How to Configure the ECI and Ethernet Static IP for ECU Upgrades and Diagnostic Tools That Require Ethernet
4) Log out of the app and close it completely. Restart the tablet, and then retry the upgrade.

Step 3) Reset the Vehicle Battery Power

Caution: Disconnecting the negative (-) battery terminal may reset some vehicle user settings. Proceed with caution.

1) Turn off all vehicle power completely.
2) Disconnect the negative (-) battery terminal for 5–10 minutes.
3) Reconnect the terminal, and then retry the ECU/DCU upgrade.

Step 4) Try Another Tablet or VCI, If Available

If the issue persists, attempt the update using another tablet or VCI to rule out an equipment-related issue.

If the Issue Persists

Contact the Vehicle Quality Department (Technical Hotline or GCCS) or the controller manufacturer for additional assistance.