GROUP

MODEL

Voluntary Service

2023-2024MY

Campaign

Niro HEV (SG2 HEV) and
2023-2024MY
Sportage HEV (NQ5 HEV)

NUMBER

DATE

SC335

February 2025

VOLUNTARY SERVICE CAMPAIGN
SUBJECT:

BMS S/W LOGIC IMPROVEMENT FOR DTC P1BB2 (SC335)

This bulletin provides information to upgrade the Battery Management System ‘BMS’ software logic on certain
2023-2024MY Sportage HEV (NQ5 HEV) vehicles produced from February 15, 2022 to October 28, 2023, and
2023-2024MY Niro HEV (SG2 HEV) vehicles produced from June 21, 2022 through February 6, 2023. Due to
a software issue, the Battery Management System (BMS) may inadvertently overcharge the 12V Lithium
battery. If the 12V Lithium battery becomes overcharged, the subject vehicles may experience a reduction in
motive power accompanied by the ‘Check Hybrid System, Stop Safely’ warning message, Hybrid system
warning lamp, Service warning lamp, Charging system warning lamp, and a rapid beeping sound for
approximately ten (10) seconds. (Note: This Voluntary Service Campaign supersedes ELE318/SA553).
Follow the procedure outlined in this publication to upgrade the BMS software judgement to prevent
overcharging of the 12V Lithium battery. 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. Before conducting the
procedure, verify that the vehicle is included in the list of affected VINs.
DTC Description:
P1BB2 - 12V Lithium Battery Cell Voltage High

 NOTICE
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.
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.
Kia America, Inc. Internal Use Only

Page 2 of 5

BMS S/W LOGIC IMPROVEMENT FOR DTC P1BB2

SUBJECT:

Refer to TSB SST081 for instructions to upgrade the ‘BMS’ 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
698.SG2 HEV BMS DTC Judgment Logic Improvement (P1BB2)
700.NQ5 HEV BMS DTC Judgment Logic Improvement (P1BB2)

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

 NO TICE
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: SC335 Sportage HEV (NQ5 HEV), Niro
HEV (SG2
February
Kia America,
Inc.HEV)
Internal
Use Only2025

Page 3 of 5

BMS S/W LOGIC IMPROVEMENT FOR DTC P1BB2

SUBJECT:

ROM ID Information Table:
Upgrade Event #698 for Niro HEV (SG2 HEV)

 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
SG2
HEV

System
BMS

IMMO

ECU P/No.

YES

37513 AT000

ROM ID
Previous

New

6000

6020

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.

Upgrade Event #700 for Sportage HEV (NQ5 HEV)
Model
NQ5
HEV

System
BMS

IMMO

ECU P/No.

YES

37513 CH000

ROM ID
Previous

New

6100

6120

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

TSB:Kia
SC335
Sportage
HEV Use
(NQ5
HEV), Niro HEV (SG2 HEV) February 2025
America,
Inc. Internal
Only

Page 4 of 5

BMS S/W LOGIC IMPROVEMENT FOR DTC P1BB2

SUBJECT:

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
SG2 HEV BMS: 37513-AT000

3157

NQ5 HEV BMS: 37513-CH000

4540

UPGRADE EVENT:
Select the applicable ‘BMS’ system module and the
Event Group for the vehicle model.
•

698.SG2 HEV BMS DTC Judgment Logic
Improvement (P1BB2)

•

Password

700.NQ5 HEV BMS DTC Judgment Logic
Improvement (P1BB2)

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: SC335 Sportage HEV (NQ5 HEV), Niro
HEV (SG2
February
Kia America,
Inc.HEV)
Internal
Use Only2025

Page 5 of 5

BMS S/W LOGIC IMPROVEMENT FOR DTC P1BB2

SUBJECT:

AFFECTED VEHICLE RANGE:
Model

Production Date Range

Sportage HEV (NQ5 HEV)

February 15, 2022 to October 28, 2023

Niro HEV (SG2 HEV)

June 21, 2022 to February 6, 2023

REQUIRED TOOL:
Tool Name

Part Number

Kia Diagnostic System

Figure

N/A

(KDS)

Comments

KDS + VCI

WARRANTY INFORMATION:
N Code: N99 C Code: C99
Model

Claim
Type

Causal P/N

Qty.

Repair

Labor Op

Op

Replacement

Description

Code

Time

P/N

Qty.

(SC335A)
NQ5

37513

Sportage HEV

HEV

CH000

BMS Software

230117R2

Logic Upgrade
R

0.3

0

M/H

N/A

0

(SC335B)
SG2

37513

Niro HEV

HEV

AT000

BMS Software

230117R3

Logic Upgrade
Note: Refer to Warranty Bulletin 2025-08 for claim submission procedures.

 NOTICE
VIN inquiry data for this repair is provided for tracking purposes only. Kia retailers should reference
SC335 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:Kia
SC335
Sportage
HEV Use
(NQ5
HEV), Niro HEV (SG2 HEV) February 2025
America,
Inc. Internal
Only