GROUP

MODEL

ELE

2026MY
EV9 (MV1a)

NUMBER

DATE

405 (Rev 1, 12/17/2025)

November 2025

TECHNICAL SERVICE BULLETIN
SERVICE ACTION: VCU OPERATION

SUBJECT:

LOGIC IMPROVEMENT (SA634)
 NOTICE

This bulletin has been revised to include additional information. New/revised sections of this
bulletin are indicated by a black bar in the margin area.
This bulletin provides information to upgrade the Vehicle Control Unit (VCU) system software on certain
2026MY EV9 (MV1a) vehicles produced from January 2, 2025 through November 3, 2025, where the
Integrated Electronic Brake (IEB) Controller Area Network (CAN) times out on startup, resulting in a DTC
warning light and failure to restart charging when the connector remains connected after charging is
completed. This condition is not associated with any braking or drivability symptoms. Follow the procedure
outlined in this publication to improve the Vehicle Control Unit (VCU) logic, which will delay the check for CAN
communication with the IEB. Refer to SST081 for software upgrade instructions using Kia Diagnostic System
(KDS) tablet and VCI-II and confirm the Upgrade Event Number/Name, ROM ID Information, and Manual Mode
passwords (if applicable) on the applicable vehicle.
DTC Description:
U151A8C – Timeout occurred due to missing IEB message

 NOTICE
A Service Action is a repair program without customer notification that is performed during the
warranty period. Any dealer requesting to perform this repair outside the warranty period will
require DPSM approval.
Repair status for a VIN is provided on KDealer+ (Service → Warranty Coverage → Warranty
Coverage Inquiry → Campaign Information). Not completed Recall / Service Action reports are
available on KDealer+ (Consumer Affairs → Not Completed Recall → Recall VIN → Select Report),
which includes a list of affected vehicles.
This issue number is SA634.
A printed copy is for reference only; publication information can be updated at any time.
Always refer to KGIS for the latest information. After logging in kdealer.com, the newest technical
publications are listed in ‘Service Releases’ and has the latest service information that has been released.

Page 2 of 5
SUBJECT:

SERVICE ACTION: VCU OPERATION LOGIC IMPROVEMENT (SA634)

Refer to TSB SST081 for instructions to upgrade the ’VCU’ system:
To correct this condition, the specified system module should be reprogrammed using KDS
as described in this bulletin in ‘Auto Mode’.
Upgrade Event Name
893.MV1a VCU Operation Logic Improvement

Connect the negative (-) terminal to the battery as shown below.

 NOTICE
Before attempting an ECU upgrade on any Kia model, make sure to first determine whether the
applicable model is equipped with an immobilizer

security system. Failure to follow proper

procedures may cause the PCM to become inoperative after the upgrade and any claims associated
with this repair may be subject to chargeback.

Printed document copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: SA634 (Rev 1) EV9 (MV1a) November 2025

Page 3 of 5
SUBJECT:

SERVICE ACTION: VCU OPERATION LOGIC IMPROVEMENT (SA634)

ROM ID Information Table:
Upgrade Event #893

 IMPORTANT
It is recommended to ALWAYS check the Electronic Parts Catalog (EPC) to locate the ECU Part
Number respective to Auto/Manual Mode ROM IDs. DO NOT reference the parts label affixed to
the ECU.

Model

System

IMMO

ECU P/No.

ROM ID
Previous

New

MV10-57H-N0F-S00
MV10-57H-N0F-S01
39751

MV10-57H-N0F-S02

1XVN4

MV10-57H-N0F-S03

MV10-57H-N0F-S06

MV10-57H-N0F-S04
EV9

VCU (Vehicle

(MV1a)

Control Unit)

MV10-57H-N0F-S05
Yes
MV10-67H-N06-S00
MV10-67H-N06-S01
39751

MV10-67H-N06-S02

1XVN3

MV10-67H-N06-S03

MV10-67H-N06-S06

MV10-67H-N06-S04
MV10-67H-N06-S05
To verify the vehicle is affected, be sure to check the Calibration Identification of the vehicle's ECM ROM ID
and reference the Information Table as necessary.

Printed document copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: SA634 (Rev 1) EV9 (MV1a) November 2025

Page 4 of 5
SUBJECT:

SERVICE ACTION: VCU OPERATION LOGIC IMPROVEMENT (SA634)

Software Information:
The required software must be installed by selecting
the ‘Auto Mode’ ECU Upgrade option.
Note: In some case, the ‘Manual Mode’ installation
option may be required ONLY if the ‘Auto Mode’
function fails or is otherwise noted above.

 NOTICE
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 the manual upgrade.

‘Manual Mode’ passwords.
Menu

Password

MV1a VCU: 39751-1XVN4

4151

MV1a VCU: 39751-1XVN3

7311

UPGRADE EVENT:
Select the applicable ‘VCU’ system module and the
Event Group.
•

893.MV1a

VCU

operation

logic

improvement

Verify the affected vehicle Calibration Identification of
the applicable ECU ROM ID and reference the
Information Table on page 3 as necessary.

Printed document copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: SA634 (Rev 1) EV9 (MV1a) November 2025

Page 5 of 5

SERVICE ACTION: VCU OPERATION LOGIC IMPROVEMENT (SA634)

SUBJECT:

AFFECTED VEHICLE RANGE:
Model

Production Date Range

EV9 (MV1a)

January 2, 2025 to November 3, 2025

REQUIRED TOOL:
Tool Name

Part Number

Kia Diagnostic System

Figure

N/A

(KDS)

Comments

KDS + VCI

WARRANTY INFORMATION:
N Code: N99 C Code: C99
Claim
Type

V

Causal P/N

39751
1XVN3

Qty.

Repair

Labor Op

Op

Replacement

Description

Code

Time

P/N

(SA634)
0

Upgrading software on
Vehicle Control Unit (VCU)

250A58R0

0.4
M/H

Qty.

N/A

0

For Substitute Transportation policy, please refer to Service Policy and Procedures Manual (SPPM)
6.11 “Kia Substitute Transportation”.

 NOTICE
VIN inquiry data for this repair is provided for tracking purposes only. Kia retailers should reference
SA634 when accessing the KDealer+ system.

Printed document copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: SA634 (Rev 1) EV9 (MV1a) November 2025