SERVICE ACTION: HCU/LDC LOGIC IMPROVEMENT FOR P-DTC (SA484)
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Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.
TSB: SA484 Niro HEV/PHEV (DE HEV/PHEV) September 2021
Manual Upgrade Procedure:
Manual Mode ECU Upgrade Passwords
DE PE HEV HCULDC 20MY: 36600-2B190
DE PE HEV HCULDC 21MY: 36600-2B192
DE PE HEV HCULDC 21MY: 36600-2B193
DE PE HEV HCULDC 21MY: 36600-2B592
DE PE PHEV HCULDC 20MY: 36600-2B195
DE PE PHEV HCULDC 21MY: 36600-2B196
Within the ECU Upgrade screen displayed, select Manual Mode.
Select the ‘HCULDC’ system under the System selection menu. Select Upgrade Event #563 and select
Upgrade to continue.
Select the appropriate control unit part number with reference to the ROM ID Information Table on
page 2, and select OK.
Enter the appropriate password from the Manual Mode password table above and select OK.
The upgrade will begin and the progress of the upgrade will appear on the bar graph.
When instructed on the KDS, turn the ignition OFF for ten (10) seconds then back on. Select OK.
Once the upgrade is complete, select OK to finalize the procedure.
When prompted, select YES to check for Diagnostic Trouble Codes (DTC) and erase any DTCs stored
such as EPS, ESC, and TPMS that may have been set during the upgrade.
Start the engine to confirm proper operation of the vehicle.
The manual upgrade should ONLY be performed if the automatic upgrade fails.
If the automatic upgrade fails, turn the ignition ‘OFF’ for about 10 seconds then place it back in
the ‘ON’ position to reset the control unit BEFORE performing manual upgrade.
See table below for ‘Manual Mode’ passwords.
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