NHTSA ID Number: 10236660
Manufacturer Communication Number: TSB_ELE290_R1
TSB/Document Date: 2023-05-26
Summary
TECHNICAL SERVICE BULLETIN: BMS DTC JUDGEMENT LOGIC IMPROVEMENT (P1AA600) - 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 update the software logic of the Battery Management System (BMS) on some 2022-2023MY EV6 (CV) vehicles produced from November 17, 2021 through February 3, 2023 which have a stored DTC P1AA600. The BMS ECU monitors voltage deviation; if over-voltage deviation between battery cells, poor insulation, abnormal cell voltage changes after charging, abnormal current change during charging, over-voltage, low voltage battery temperature deviation or average cell deviation during driving is detected, the BMU sets DTC P1AA600. 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.
GROUP
MODEL
ELE
2022-2023MY
EV6 (CV)
NUMBER
DATE
290 (Rev 1, 05/24/2023)
April 2023
TECHNICAL SERVICE BULLETIN
SUBJECT:
BMS DTC JUDGEMENT LOGIC IMPROVEMENT (P1AA600)
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 update the software logic of the Battery Management System (BMS) on
some 2022-2023MY EV6 (CV) vehicles produced from November 17, 2021 through February 3, 2023 which
have a stored DTC P1AA600. The BMS ECU monitors voltage deviation; if over-voltage deviation between
battery cells, poor insulation, abnormal cell voltage changes after charging, abnormal current change during
charging, over-voltage, low voltage battery temperature deviation or average cell deviation during driving is
detected, the BMU sets DTC P1AA600. 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 3 of this bulletin.
DTC Description:
P1AA600 – Hybrid
/EV Battery Abnormal Performance Detection
Current
Info
Info
Expanded
DTC
Code 1
Code 2
‘New’ DTC(s)
P1AA600
Fault Description
1
P1AA700
Cell voltage deviation
2
P1AA800
Insulation resistance breakdown
4-64
P1AA900
Cell voltage movement
128
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 (P1AA600)
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
656. CV BMS DTC JUDGMENT LOGIC IMPROVEMENT
657. CV BMS DTC JUDGMENT LOGIC IMPROVEMENT
IMPORTANT
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.
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: ELE290 (Rev 1) EV6 (CV) April 2023
Page 3 of 8
BMS DTC JUDGEMENT LOGIC IMPROVEMENT (P1AA600)
SUBJECT:
ROM ID INFORMATION TABLE:
Upgrade Event #656 (U.S. 23MY)
Event
Model
23MY
CV
System
ECU P/No.
BMS
375A0 CV150
All US w/
Electric Heater
375A0 CV050
ROM ID
Previous
New
5300
5500
5400
5308
5508
5408
5102
656
375A0 CV100
22MY
CV
BMS*
5202
5502
5302
5402
w/o Electric Heater
510A
for other Country
375A0 CV000
520A
550A
530A
540A
*For Non-US market vehicle located in the US (ex. Canada).
Upgrade Event #657 (U.S. 22MY)
Event
657
Model
22MY
CV
System
BMS
ECU P/No.
375A0 CV150
ROM ID
Previous
5100
5200
New
5500
All US w/
Electric Heater
375A0 CV050
5108
5208
5508
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: ELE290 (Rev 1) EV6 (CV) April 2023
Page 4 of 8
BMS DTC JUDGEMENT LOGIC IMPROVEMENT (P1AA600)
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.
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TSB/Document ID: TSB_ELE290_R1
Replacement Service Bulletin Number:
MFR Communication Date: 2023-05-24
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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