NHTSA ID Number: 11006055
Manufacturer Communication Number: SERVICE CAMPAIGN 9B4
TSB/Document Date: 2024-08-07
Summary
This bulletin provides the procedure to update the software for the Battery Management System (BMS) on certain Elantra Hybrid (CN7 HEV), Sonata Hybrid (DN8 HEV), and Tucson Hybrid (NX4 HEV) vehicles that may exhibit a warning light with DTC P1BB20.
GROUP
NUMBER
CAMPAIGN
Technical Service Bulletin
SUBJECT:
DATE
24-01-054H
MODEL(S)
JULY 2024
SEE BELOW
BMS SOFTWARE UPDATE FOR DTC P1BB20: 12V BATTERY OVER
VOLTAGE WARNING (SERVICE CAMPAIGN 9B4)
IMPORTANT
Dealers must perform this service campaign on all affected vehicles prior to customer retail delivery
and whenever an affected vehicle is in the shop for any maintenance or repair.
Access the “Vehicle Information” screen via WEBDCS to identify open campaigns.
Description: This bulletin provides the procedure to update the software for the Battery Management
System (BMS) on certain Elantra Hybrid
(CN7 HEV), Sonata Hybrid (DN8 HEV), and Tucson Hybrid
(NX4 HEV) vehicles that may exhibit a warning light with DTC P1BB20.
DTC Description: P1BB20 – 12V Lithium Battery Cell Voltage High
Applicable Vehicles (Certain):
• 2021–2023MY Elantra Hybrid (CN7 HEV) produced from 12/15/2020 - 02/13/2023
• 2020-2022MY Sonata Hybrid (DN8 HEV) produced from 01/29/2020 - 03/08/2023
• 2022–2024MY Tucson Hybrid (NX4 HEV) produced from 01/20/2021 - 12/18/2023
GDS Information:
System
BMS
Event #
Description
796
DN8 HEV 12V LITHIUM BATTERY OVER VOLTAGE WARNING
LIGHT IMPROVEMENT (P1BB20)
1037
CN7 HEV 12V LITHIUM BATTERY OVER VOLTAGE WARNING
LIGHT IMPROVEMENT
NX4 HEV 12V LITHIUM BATTERY OVER VOLTAGE WARNING
LIGHT IMPROVEMENT
(*or use a later available event as listed in the GDS BMS Update screen if one is available.)
1038
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair
SUBJECT:
BMS SOFTWARE UPDATE FOR DTC P1BB20: 12V BATTERY OVER VOLTAGE WARNING
(SERVICE CAMPAIGN #9B4)
Warranty Information:
Model
Op. Code
Operation
30D163R0
BMS
Software
Update
Elantra Hybrid
(CN7 HEV)
Sonata Hybrid
(DN8 HEV)
Op.
Time
Casual Part
37513-BY000 (CN7 HEV)
0.3 M/H 37513-L7000 (DN8 HEV)
37513-P0000 (NX4 HEV)
Nature
Code
Cause
Code
I14
ZZ3
Tucson Hybrid
(NX4 HEV)
NOTE 1: Submit claim on Claim Entry Screen as “Campaign” type.
NOTE 2: If a part is found in need of replacement while performing this campaign and the affected
part is still under warranty, submit a separate claim using the same repair order. If the affected part is
out of warranty, submit a Prior Approval request for goodwill consideration prior to performing the
work.
NOTE 3: Op times include VIN, Mileage, and photo capture of the “ECU update complete” screen as
outlined in the Digital Documentation Policy.
ROM ID Information Table: Event # 796
Model
MY
System
ECU
Part Number
37513-L5000
Sonata
Hybrid
(DN8 HEV)
2020 - 2022
BMS
37513-L7000
ROM ID
Old
5000
5200
5400
5420
5440
5460
5480
5500
5600
5620
5640
5680
5700
5720
New
5520
5740
ROM ID Information Table: Event # 1037
Model
MY
System
ECU
Part Number
Elantra
Hybrid
(CN7 HEV)
2021 - 2023
BMS
37513-BY000
TSB #: 24-01-054H
ROM ID
Old
6000
6020
6040
6060
New
6080
Page 2 of 5
SUBJECT:
SUBJECT:
BMS SOFTWARE UPDATE FOR DTC P1BB20: 12V BATTERY OVER VOLTAGE WARNING
(SERVICE CAMPAIGN #9B4)
ROM ID Information Table: Event # 1038
Model
MY
ECU
Part Number
System
ROM ID
Old
New
6000
Tucson
Hybrid
(NX4 HEV)
6020
2021 – 2024
BMS
37513-P0000
6040
6120
6060
6100
Manual Mode Password: Event # 796
ECM Menu
Password
DN8 HEV BMS 37513-L5000
5000
DN8 HEV BMS 37513-L7000
7000
Manual Mode Password: Event # 1037
ECM Menu
Password
CN7 HEV BMS 37513-BY000
7531
Manual Mode Password: Event # 1038
ECM Menu
Password
NX4 HEV BMS 37513-P0000
3000
TSB #: 24-01-054H
Page 3 of 5
SUBJECT:
SUBJECT:
BMS SOFTWARE UPDATE FOR DTC P1BB20: 12V BATTERY OVER VOLTAGE WARNING
(SERVICE CAMPAIGN #9B4)
Service Procedure:
STUI
This TSB includes Repair validation photos. Refer to the latest Warranty Digital Documentation
Policy for requirements.
NOTICE
You must initially perform the GDS ECU update in Auto Mode.
• If the ECU update starts but then fails in Auto Mode, perform the update in Manual Mode
to recover.
NOTICE
GDS Vehicle Battery Low Voltage Warning:
If voltage is below 12 volts per the GDS warning, then select Back and run the vehicle for at least
20 minutes to ensure an adequate battery charge for reliable update results. Turn ignition back
ON, and then retry the ECU update again.
1.
Perform the ECU update in Auto Mode.
Use the ID Check to verify the ROM ID before updating the software.
i
#796: DN8 HEV - EXAMPLE
Information
Refer to TSB 15-GI-001 for additional
information for the ECU update Procedure.
TSB #: 24-01-054H
Page 4 of 5
SUBJECT:
SUBJECT:
2.
BMS SOFTWARE UPDATE FOR DTC P1BB20: 12V BATTERY OVER VOLTAGE WARNING
(SERVICE CAMPAIGN #9B4)
STUI
Take a screenshot of the “ECU Update
Complete” screen using your tablet and
upload to STUI.
3.
After the ECU update process shows 100%
complete, cycle the ignition key to OFF for at
least 10 seconds to reset the control unit.
4.
Perform an All Systems Fault Code search
and erase DTC history that had incidentally
occurred from the ECU update.
5.
Start the vehicle in Ready mode to confirm
proper operation of the vehicle.
TSB #: 24-01-054H
Page 5 of 5
SUBJECT:
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TSB/Document ID: SERVICE CAMPAIGN 9B4
Replacement Service Bulletin Number:
MFR Communication Date: 2024-07-04
MFR Internal Campaign ID/Software Version: SERVICE CAMPAIGN 910G
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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