GROUP

MODEL

ELE

2019-2022MY
Niro EV (DE EV)

NUMBER

DATE

293

May 2023

TECHNICAL SERVICE BULLETIN
SUBJECT:

BMS DTC JUDGEMENT LOGIC IMPROVEMENT

This bulletin provides the procedure to update the software logic of the Battery Management System (BMS)
on some 2019-2022MY Niro EV (DE EV) vehicles produced from December 5, 2018 through April 12, 2022. The
BMS ECU monitors voltage deviation between battery cells, poor insulation, abnormal cell voltage changes
after charging, abnormal current change during charging, over-voltage, temperature deviation or average cell
deviation during driving is detected. These conditions can cause the BMU to set DTC P1AA600. The affected
vehicles may exhibit a reduction in power and speed (limp home mode) and a MIL ‘ON’ with DTC P1AA600
stored. This BMS DTC logic improvement will expand DTC P1AA600 into multiple DTCs to aid in proper
diagnosis, which reduces the required time and steps outlined in the ‘DTC Inspection’ on KGIS to determine
the fault using ‘freeze frame’ data (refer to table below). Follow the procedure outlined in this publication to
apply the improved logic to the ‘BMS’ system using the KDS ECU Upgrade function as described in this bulletin.
For confirmation that the latest reflash has been applied to a vehicle you are working on, verify the ROM ID
using the table on page 5 of this bulletin.
DTC Description:
P1AA600 - Hybrid/EV Battery Abnormal Performance Detection

 IMPORTANT
A Vehicle Diagnosis Number (VDN) must be created prior to updating the ‘BMS’ software. If a VDN
is not created, Warranty claim submission issues WILL occur. This software update is not a remedy
for DTC P1AA600. The DTC must be stored for this TSB to apply. Technicians are to save the freeze
frame data for diagnosis purpose and applicable repair.
Current

Info

Info

Expanded

DTC

Code 1

Code 2

‘New’ DTC(s)

1

P1AA700

Cell voltage deviation

2

P1AA800

Insulation resistance breakdown

4-64

P1AA900

Cell voltage movement

128
P1AA600

Fault Description

P1AAA00

Cell voltage deviation while charging

1

P1AAB00

Temperature too high

2

P1AAC00

Cell voltage too high

4

P1AAD00

Cell voltage too low

8

P1AAE00

Temperature deviation

16

P1AAF00

Abnormal voltage change detection logic issue

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 8

BMS DTC JUDGEMENT LOGIC IMPROVEMENT

SUBJECT:

ECU Upgrade Procedure:
To correct this condition, the ECU should be reprogrammed using the KDS
download, as described in this bulletin.
Upgrade Event Name
642. DE EV BMS DTC JUDGMENT LOGIC IMPROVEMENT

 NOTICE
•

Confirm a fully charged battery (12.3 volts or higher is necessary) is used or utilize a fully
charged jump starter box connected to the battery.

•

Ensure the KDS GDS is sufficiently charged at 60% or higher prior to reflash.

•

All ECU upgrades must be performed with the ignition set to the ‘ON’ position unless otherwise
stated.

•

Damaged VCI II units should not be used and promptly replaced.

•

Be careful not to disconnect the VCI-II connected to the vehicle during the ECU upgrade
procedure.

•

DO NOT start the engine during ECU upgrade.

•

DO NOT turn the ignition key ‘OFF’ or interrupt the power supply during ECU upgrade.

•

When the ECU upgrade is completed, turn the ignition ‘OFF’ and wait 10 seconds before
starting the engine.

•

ONLY use approved ECU upgrade software designated for the correct application.

 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.

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

TSB: ELE293 Niro EV (DE EV) May 2023

Page 3 of 8

BMS DTC JUDGEMENT LOGIC IMPROVEMENT

SUBJECT:

 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.

ROM ID INFORMATION TABLE:
Upgrade Event #642
Model

System

ECU P/No.

ROM ID
Previous

New

6400, 6500, 6700, 6730, 6740,
375A0 K4052

6770, 6780, 6790, 6800, 6820,

6880

6840, 6860, 6900
6402, 6502, 6702, 6732, 6742,
375A0 K4002

6772, 6782, 6792, 6802, 6822,

6882

6842, 6862, 6902
6504, 6734, 6744, 6774, 6784,
375A0 K4452

6794, 6804, 6824, 6844, 6864,

6884

6904
6506, 6736, 6746, 6776, 6786,
375A0 K4402

6796, 6806, 6826, 6846, 6866,

6886

6906
DE EV

BMS
375A0 K4053

375A0 K4003

375A0 K4453

375A0 K4403

6960, 6980, 7020, 7040,
7050, 7060, 7080

6962, 6982, 7022, 7042,
7052, 7062, 7082

6964, 6984, 7024, 7044,
7054, 7064, 7084

6966, 6986, 7026, 7046,
7056, 7066, 7086

7100

7102

7104

7106

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

TSB: ELE293 Niro EV (DE EV) May 2023

Page 4 of 8

BMS DTC JUDGEMENT LOGIC IMPROVEMENT

SUBJECT:

 NOTICE
Prior to performing the ECU upgrade, be sure to check that the KDS is fully charged.
1.

Connect the VCI-II to the OBD-II connector,
located

under

the

driver’s

side

of

the

instrument panel.

 NOTICE
The ECU upgrade function on KDS
operates wirelessly. It is not necessary
to perform the upgrade via USB cable.

2.

With the ignition ON, turn ON the KDS tablet.
Select ‘KDS’ from the home screen.

3.

Confirm communication with VCI (A) and then
configure the vehicle (B) using the ‘AUTO VIN’
(C) feature.

B
A

C
4.