NHTSA ID Number: 11029938
Manufacturer Communication Number: 26-EV-002H TSB
TSB/Document Date: 2026-03-11
Summary
Some 2025MY IONIQ 5 (NEA EV) vehicles may experience a charging condition where a voltage difference between battery cells prevents the High Voltage Battery
from fully charging. If either of the DTCs associated with the condition are identified in "Active" status, follow the procedure outlined in this TSB to replace the Battery System Assembly (BSA).
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TSB/Document ID: 26-EV-002H TSB
Replacement Service Bulletin Number:
MFR Communication Date: 2026-03-03
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: FUEL/PROPULSION SYSTEM
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
GROUP
EV SYSTEMS
Technical Service Bulletin
DATE
FEBRUARY 2026
NUMBER
26-EV-002H
MODEL(S)
IONIQ 5 (NEA EV)
HV BATTERY INSPECTION & REPLACEMENT
SUBJECT:
This TSB supersedes 25-EV-002H to update applicable vehicle production dates on page 1,
part numbers on page 2, Op codes on page 3, and BSA replacement approval process to
the latest process on page 4.
IMPORTANT
This field action requires justification in the form of a customer concern, and a confirmed case for
the related symptom outlined in the TSB, prior to any repair work. If justification requirements are
not met, any submitted claims are subject to debit. High Voltage Coverage (EV/HEV/PHEV)
applies.
See Warranty Information section for more details.
Description: Some 2025MY IONIQ 5 (NEA EV) vehicles may experience a charging condition where
a voltage difference between battery cells prevents the High Voltage Battery from fully charging. The
two DTCs associated with this condition are:
• P1AA700 – Hybrid/EV Battery Abnormal Performance: Cell Voltage Deviation
• P1AD300 – Hybrid/EV Battery Abnormal Performance: MISD.
If either of the DTCs listed above are identified in "Active" status, follow the procedure outlined in this
TSB to replace the Battery System Assembly (BSA).
Applicable Vehicles:
Model Year
Model
Production Dates
VIN begins with
2025
IONIQ 5 (NEA EV)
12/10/2024 – 09/22/2025
7YA
NOTICE
To avoid any potential damage to IONIQ vehicles, IONIQ repairs can only be performed at IONIQ
certified dealers.
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair
HV BATTERY INSPECTION & REPLACEMENT
SUBJECT:
Parts Information:
Model
Part Number
Battery System Assy
(Long Range)
37501-PI020
37501-PI050
37501-PI900
37501-PI920
Qty: 1
Battery System Assy
(Short Range)
37501-PI120
37501-PI150
37501-PI820
Qty: 1
37535-GI050
Qty: 8
37535-GI500
Qty: 18
00232-19098
Qty: 2
IONIQ 5
(NEA EV)
Pink-Antifreeze /
Coolant
TSB #: 26-EV-002H
Figure
Remarks
Part Name
Page 2 of 4
HV BATTERY INSPECTION & REPLACEMENT
SUBJECT:
Warranty Information:
Model
IONIQ 5
(NEA EV)
Op. Code
Operation
Op.
Time
Causal Part
50DV03R0
37501-PI050
50DV03R1
37501-PI150
50DV03R2
Battery Inspection &
Replacement
50DV03R3
2.9 M/H
37501-PI920
Nature
Code
Cause
Code
W11
ZZ3
37501-PI020
50DV03R4
37501-PI820
NOTE 1: Submit claim on Claim Entry Screen as “Campaign” type.
NOTE 2: This TSB contains repair validation photo(s). Op times include VIN, Mileage, and Repair
validation photo (s) as outlined in the Digital Documentation Policy
NOTE 3: The incident parts are subject to callback through the normal Warranty Technical Center
(WTC) parts return process. Claim is subject to debit if the part is not returned.
NOTE 4: If a part is found in need of replacement while performing this TSB 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 5: If DTC P1AA700 and/or P1AD300 are confirmed in "active" status, a submission for a PA
approval for BSA replacement is required.
NOTE 6: Dealer will be reimbursed with 2 gallons of coolant under both op codes.
Service Procedure:
DIGITAL DOCUMENTATION
This TSB includes Repair validation photos. Refer to the latest Warranty Digital Documentation
Policy for requirements.
NOTICE
Applying the recommended torque to all fasteners is essential to reduce potential issues from
occurring after the service procedure.
!
WARNING
When working on the high voltage system, ensure to read and comply with the "Safety
Precautions, Cautions and Warnings" section of the shop manual. Failure to comply with the
safety instructions may result in serious accidents due to electric shock or leakage.
When working on the high voltage system, ensure to cut off the high voltage first per the “High
Voltage Cut-off Procedure" section of the shop manual. Failure to comply with the safety
instructions may result in serious accidents due to electric shock or leakage.
TSB #: 26-EV-002H
Page 3 of 4
HV BATTERY INSPECTION & REPLACEMENT
SUBJECT:
1.
2.
Use GDS to perform a Fault Code Search on
the BMS system for DTCs P1AA700 and
P1AD300:
• If P1AA700 and/or P1AD300 are active,
then submit for PA approval.
• If P1AA700 and P1AD300 are NOT
listed, proceed with the normal
diagnostic process.
DIGITAL
DOCUMENTATION
Using the STUI camera function, take a
photo of the new BSA’s part label.
Upload the photo to STUI.
NOTE: If the STUI camera function is
NOT used, write the last 6 digits of the
VIN and date of repair on a piece of
paper to include in the photo.
3.
Replace the BSA (A) by referring to the shop
manual:
• Battery Control System > High
Voltage Battery System > Battery
System Assembly (BSA) >
Removal / Installation
NOTICE
Ensure the one-time bolts are replaced
per the shop manual procedures.
A
A
Applying the recommended torque to all
fasteners is essential to reduce potential
issues from occurring after the service
procedure.
4.
The service procedure is now complete.
TSB #: 26-EV-002H
Page 4 of 4
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