Symptoms
The 5021-27-7F11 error code occurs when an error happens during the ECU upgrade process, and the same ECU upgrade is attempted again.
Applicable ECU Upgrades : 1410.CN7 HEV WARNING LIGHTS AND SLOW ACCELERATION IMPROVING UPGRADE
Cause
This error occurs when the ECU software reprogramming process fails to complete successfully. Under certain conditions or environments, the initial ECU upgrade may fail, and a recovery ECU upgrade attempt may trigger this error code.
Solution
If the 5021-27-7F11 error code appears, the affected ECU must be replaced. Please contact Techline and get a confirmation to replace the ECU.
Customer Support
GSW - HYUNDAI, GENESIS:
https://ccc.hyundai.com/nxui/ccc/index.html
Global Service Way - KIA:
https://www.kia-hotline.com/euro5/login.tiles
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