Symptom: Error code [5021-36-7000] occurs during an ECU upgrade.
Cause: Occurs when the ECU does not respond to an ECU upgrade data transfer command or the specified time limit is exceeded.
Solution:
1. Check whether any aftermarket equipment is installed in the vehicle.
2. Check the diagnostic tool connection and verify that the sensor data for the target control module is displayed correctly.
3. If the control module connection and sensor outputs are normal, retry the ECU upgrade.
4. Disconnect the 12 V battery power for at least 15 minutes, reconnect it, and retry the ECU upgrade.
5. If the same failure occurs after retrying, contact GIT to perform testing with a file that has adjusted timing.
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