Error “7000-31-7F72” occurring at 95–99% during an ECU upgrade is primarily caused by routine execution conditions not being met due to aftermarket devices or similar equipment. Verify that the vehicle is IG On, disconnect all aftermarket devices, and perform a battery power reset. If the issue recurs, contact the controller manufacturer.
Symptom
The ECU upgrade stops at 95–99%, and error “7000-31-7F72” is displayed on the screen.
Cause
- The ECU sends a negative response because the routine execution conditions are not met.
Resolution
If “7000-31-7F72” is displayed 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 with the engine OFF.
If the voltage appears low, use of an external power supply or battery support unit is recommended.
Step 2) Disconnect Aftermarket Devices
Disconnect all aftermarket devices, including taxi terminals, dash cameras, and LED advertising signs, and then retry the upgrade.
Aftermarket devices have been identified as the most common cause in the field.
Step 3) Perform a Vehicle Battery Power Reset
Caution: Disconnecting the negative (-) battery terminal may reset certain vehicle settings.
1) Turn the vehicle power completely OFF.
2) Disconnect the negative (-) battery terminal for 5–10 minutes.
3) Reconnect the terminal, and then retry the ECU upgrade.
Step 4) If the Issue Recurs on the Same Vehicle Model
Contact the controller (ECU) manufacturer. Contact the Vehicle Quality Department or the Kia Technical Hotline for further assistance.
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