NHTSA ID Number: 11033840
Manufacturer Communication Number: 26-AT-005H TSB
TSB/Document Date: 2026-06-16
Summary
This bulletin provides information related to a Transmission Control Unit (TCU) software update for some vehicles equipped with an 8-speed wet dual clutch transmission (8WDCT). The software update revises the touch point learning variation, improving drivability and judder symptoms. Some 8WDCTs (indicated by a new part number) received an updated clutch spring. The correct TCU software update must be matched with the correct corresponding 8WDCT hardware, otherwise, drivability concerns may occur. This service procedure should be performed prior to any 8WDCT replacements done for drivability/judder concerns.
GROUP
NUMBER
AUTOMATIC
TRANSMISSION
Technical Service Bulletin
SUBJECT:
DATE
26-AT-005H
MODEL(S)
JUNE 2026
SEE BELOW
DRIVABILITY & JUDDER IMPROVEMENT - 8WDCT TCU UPDATE
FOR VEHICLES WITH 2.5T ENGINES
This bulletin supersedes TSB 23-AT-012H to include an updated title and description, indicating
this service procedure should be performed prior to replacing the dual-clutch transmission for
a drivability concern.
Description: This bulletin provides information related to a Transmission Control Unit (TCU) software
update for some vehicles equipped with an 8-speed wet dual clutch transmission (8WDCT).
The software update revises the touch point learning variation, improving drivability and judder
symptoms. Some 8WDCTs (indicated by a new part number) received an updated clutch spring. The
correct TCU software update must be matched with the correct corresponding 8WDCT hardware,
otherwise, drivability concerns may occur. This service procedure should be performed prior to any
8WDCT replacements done for drivability/judder concerns.
Applicable Vehicles:
Model Year
Model
VINs Start with
2022 & Later
Santa Cruz (NXT)
5NT
2021 – 2023
Santa Fe (TMA)
5NM
2021 – 2022
Sonata (DN8A) w/N-Line Trim
5NP
2021 & Later
Sonata (DN8) w/N-Line Trim
KMH
Theta 2.5T
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair
DRIVABILITY & JUDDER IMPROVEMENT - 8WDCT TCU UPDATE
FOR VEHICLES WITH 2.5T ENGINES
SUBJECT:
Parts Information –
BEFORE Improvement 8WDCT:
Model
Event
No.
Drive
Type
Trans
Type
Santa
Cruz
(NXT)
897
4WD
SBC
2WD
Santa Fe
(TMA)
895
SBW
4WD
Sonata
(DN8,
DN8A)
N-Line
Trim
896
2WD
8WDCT Assembly Part Number
Remarks
T/M Assembly
Reman
430F0-2N081
N/A
w/ TCU
43000-2N022
43000-2N022RM
w/o TCU
430F0-2N085
N/A
w/ TCU
43000-2N034
43000-2N034RM
w/o TCU
430F0-2N086
N/A
w/ TCU
43000-2N035
43000-2N035RM
w/o TCU
430F0-2N034
N/A
w/ TCU
SBW
TCU
Calibration ID
WNX4T25X4X900NS9
VTMPT25XXX900NSA
VDN8T25XXX900NSC
43000-2N050
43000-2N050RM
w/o TCU
NOTE: SBC = Shift By Cable, SBW = Shift By Wire
Parts Information –
AFTER Improvement 8WDCT:
8WDCT Assembly Part Number
Model
Event
No.
Drive
Type
Trans
Type
T/M Assembly
Reman
Santa
Cruz
(NXT)
922
4WD
SBC
43000-2N029
N/A
43000-2N036
43000-2N036RM
2WD
Santa Fe
(TMA)
920
Sonata
(DN8,
DN8A)
N-Line
Trim
921
Remarks
WNX4T25X4W900NS1
SBW
4WD
2WD
SBW
TCU
Calibration ID
VTMPT25XXW900NS1
43000-2N037
43000-2N037RM
43000-2N052
43000-2N052RM
w/o TCU
VDN8T25XXW900NS1
NOTE: SBC = Shift By Cable, SBW = Shift By Wire
TSB #: 26-AT-005H
Page 2 of 14
SUBJECT:
DRIVABILITY & JUDDER IMPROVEMENT - 8WDCT TCU UPDATE
FOR VEHICLES WITH 2.5T ENGINES
SST Information:
Tool Name
Tool Number
VCI 3
G0VHNNN06
Figure
Ordering Information
Website:
https://hyundaiessentialtools.com/
Email:
[email protected]
VCI 2
Phone: 1-855-763-9199
Hours: 7 AM – 7 PM CST
G1XDDMN001
NOTE: VCI 2 can NO longer be ordered but can be used for the updates in this TSB.
GDS Information:
Model
System
Santa Cruz (NXT)
Santa Fe (TMA)
AT
Event Number*
Description
897
NX4AT THETA 2.5T SOL. VALVE OPERATING
FREQUENCY LOGIC IMPROVEMENT(TCU)
895
TM PE THETA 2.5T SOL. VALVE OPERATING
FREQUENCY LOGIC IMPROVEMENT(TCU)
Sonata
DN8 N THETA 2.5T SOL. VALVE OPERATING
(DN8, DN8A)
896
FREQUENCY LOGIC IMPROVEMENT(TCU)
N-Line Trim
(*or use a later available event listed in the GDS DCT Update screen if one is available.)
TSB #: 26-AT-005H
Page 3 of 14
SUBJECT:
DRIVABILITY & JUDDER IMPROVEMENT - 8WDCT TCU UPDATE
FOR VEHICLES WITH 2.5T ENGINES
Warranty Information:
Model
Op. Code
Operation
Op.
Time
Santa Fe (TMA)
Sonata
(DN8, DN8A)
N-Line Trim
Nature
Code
Cause
Code
S21
ZZ3
954A1-2N250
954A0F02
Santa Cruz
(NXT)
TCU Software Update
(BEFORE improved
8WDCT) +
Vehicle Calibration
0.7
M/H
954A1-2N060
954A1-2N460
Santa Fe (TMA)
Sonata
(DN8, DN8A)
N-Line Trim
Causal Part
954A1-2N251
954A1F03
TCU Software Update
(AFTER improved
8WDCT) +
Vehicle Calibration
0.7
M/H
954A1-2N060
Santa Cruz
954A1-2N460
(NXT)
NOTE 1: Normal warranty applies.
NOTE 2: Submit claim on Claim Entry Screen as “Warranty” type.
NOTE 3: This TSB includes repair validation photo(s). Op times include VIN, mileage, and photo
capture of the ECU Update “Success” result screen as outlined in the Digital Documentation Policy.
NOTE 4: If any part(s) not subject to this TSB are found in need of replacement while performing the
repair procedure, and the affected part(s) are still under warranty, the dealer may submit a separate
claim using the same repair order. If the part(s) not subject to this TSB are out of warranty coverage,
the dealer has the option to submit a PA Request for goodwill consideration on a case-by-case basis.
TSB #: 26-AT-005H
Page 4 of 14
SUBJECT:
DRIVABILITY & JUDDER IMPROVEMENT - 8WDCT TCU UPDATE
FOR VEHICLES WITH 2.5T ENGINES
ROM ID Information
(BEFORE Improvement 8WDCT):
Model
Santa Fe
(TMA)
Sonata
(DN8, DN8A)
N-Line Trim
Santa Cruz
(NXT)
Event
System
895
896
897
AT
TCU
Part Number
ROM ID
Current
Latest
954A0-2N250
(SBW)
VTMPT25XXX720NS0
VTMPT25XXX720NS1
VTMPT25XXX730NS2
VTMPT25XXX800NS3
VTMPT25XXX800NS4
VTMPT25XXX800NS5
VTMPT25XXX832NS6
VTMPT25XXX900NS8
VTMPT25XXX900NSA
954A0-2N060
(SBW)
VDN8T25XXX700NS0
VDN8T25XXX700NS1
VDN8T25XXX720NS2
VDN8T25XXX720NS3
VDN8T25XXX720NS4
VDN8T25XXX730NS5
VDN8T25XXX800NS6
VDN8T25XXX832NS7
VDN8T25XXX832NS8
VDN8T25XXX900NSA
VDN8T25XXX900NSC
954A0-2N460
(SBC)
WNX4T25X4X730NS0
WNX4T25X4X800NS1
WNX4T25X4X800NS2
WNX4T25X4X800NS3
WNX4T25X4X800NS4
WNX4T25X4X832NS5
WNX4T25X4X900NS7
WNX4T25X4X900NS9
NOTE: SBC = Shift By Cable, SBW = Shift By Wire
TSB #: 26-AT-005H
Page 5 of 14
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TSB/Document ID: 26-AT-005H TSB
Replacement Service Bulletin Number:
MFR Communication Date: 2026-06-05
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
MFR Component System:
MFR Component Subsystem:
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