GROUP

NUMBER

AUTOMATIC
TRANSMISSION
DATE

Technical Service Bulletin

SUBJECT:

23-AT-013H

MODEL(S)

AUGUST 2023

VELOSTER N (JSN)
KONA N (OSN)
ELANTRA N (CN7N)

8-SPEED WET DCT TCU UPGRADE – TOUCH POINT LEARNING
IMPROVEMENT FOR 2.0T VEHICLES

Description: This bulletin provides information related to a Transmission Control Unit (TCU) software
update for certain vehicles equipped with an 8-speed wet dual clutch transmissions (8WDCT) that improves
the touch point learning variation. Certain 8WDCTs (indicated by a new part number) received an improved
clutch spring. The correct TCU software update must be matched with the correct corresponding 8WDCT
hardware, otherwise drivability concerns may occur.
Applicable Vehicles:
• 2021MY ~ Veloster N (JSN) 2.0T
• 2022MY ~ Kona N (OSN) 2.0T
• 2022MY ~ Elantra N (CN7N) 2.0T
Parts Information:
Before-Improvement 8WDCT
MODEL

ENGINE

TYPE

T/M ASSY NO.

REMAN. PART

REMARK

Veloster N
(JSN)

Theta
2.0T

2WD
SBC
+
ELSD

430F0-2N031

N/A

with TCU

Kona N
(OSN)

Theta
2.0T

2WD
SBC
+
ELSD

430F0-2N061

N/A

with TCU

N/A

with TCU

43000-2N002

43000-2N060

2WD 430F0-2N071
+
ELSD 43000-2N070
Note: SBC = Shift By Cable, SBW = Shift By Wire
Elantra N
(CN7N)

Theta
2.0T

SBC

LATEST TCU CAL ID
(EVENT #)

WJSNT20XXX900NS7
(#898)
43000-2N002RM without TCU
WOSNT20XXX900NS6
(#899)
43000-2N060RM without TCU
WCN7T20XXX900NS4
(#900)
43000-2N070RM without TCU

Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair

SUBJECT:

8-SPEED WET DCT TOUCH-POINT LEARNING IMPROVEMENT – 2.0T VEHICLES

Warranty Information:
MODEL

OP CODE

OPERATION

OP TIME

CAUSAL PART

NATURE CAUSE
CODE
CODE

TCU Upgrade
954A1-2N410 (OSN)
(Before) +
0.7 M/H 954A1-2N510 (CN7N)
S21
ZZ3
Vehicle
954A1-2N020 (JSN)
Calibration
NOTE 1: Normal warranty applies.
NOTE 2: Submit claim on Claim Entry Screen as “Warranty” type.
NOTE 3: This TSB includes Repair validation photos. OP times including VIN, Mileage, and Repair
validation photos as outlined in the Digital Documentation Policy.
NOTE 4: 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 5: 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.
Kona N (OSN)
Elantra N (CN7N) 954A0F02
Veloster N (JSN)

TSB #: 23-AT-013H

Page 2 of 11
SUBJECT:

8-SPEED WET DCT TOUCH-POINT LEARNING IMPROVEMENT – 2.0T VEHICLES

SUBJECT:

Service Procedure:

STUI
This TSB includes Repair validation photos. Refer to the latest Digital Documentation Policy for
requirements.
1. Refer to the flowchart below for overall procedure.

Vehicle In

Information
Please refer to standard HMA warranty
policy & procedures for DCT replacement.

Vehicle requires
DCT replacement/
experiencing
drivability concerns

Check TCU ROM ID.
Is it latest S/W?

NOTICE

NO

Perform TCU
Upgrade (#898-900)

Make sure that the TCU CAL ID
is the latest and matches the
corresponding part number,
otherwise shift shock may
occur.

YES
If vehicle experiences
hesitation/jerking
during inspection,
perform T-P curve learning.

Vehicle Calibration
1) Air Bleeding
2) Transmission Learning
3) Line Pressure Removal Mode
4) Line Pressure Removal Mode Off

Vehicle Inspection
-Static Test
-Creep Test
-Drive Test
-Other

IF NEEDED

Information

T-P curve
learning

T-P curve learning
1) From a standstill, start driving
with ~10% accelerator input,
slowly increasing to ~30%.
2) From a standstill, start driving
with ~30% accelerator input,
slowly increasing to ~50%.
* Learning will be more
successful when accelerator
input is slowly and
continuously increased while
driving.

Vehicle Out

TSB #: 23-AT-013H

Page 3 of 11
SUBJECT:

SUBJECT:

8-SPEED WET DCT TOUCH-POINT LEARNING IMPROVEMENT – 2.0T VEHICLES

DCT/TCU Replacement Procedure: Only necessary if replacing entire 8WDCT
1. Prior to replacing a DCT/TCU, it is necessary to to perform the “Line Pressure Removal” mode in GDS.

S/W
Management

Dual Clutch
Transmission
System

Line Pressure
Removal
Mode

Dual Clutch
Control System

NOTICE
If the “Line pressure removal
mode” is not performed,
drivability concerns and warning
lights/DTCs can occur (P193B79,
P0868, rattling/shift shock, unable
to drive forward/reverse).

2. Continue removal of the DCT/TCU according to the vehicle shop manual.

i

Information

See instructions on pages 5-6 regarding TCU removal/installation.

3. After replacing the DCT/TCU, perform the air bleeding/DCT initialization/DCT Learning according to the
flow chart on page 5. See the table below regarding if DCT learning is required.
DCT TYPE
DCT (NEW)

TCU INCLUDED?

DCT LEARNING REQUIRED?

YES

NO, not required

NO
YES

DCT (Remanufactured)

YES, required

NO

TSB #: 23-AT-013H

Page 4 of 11
SUBJECT:

8-SPEED WET DCT TOUCH-POINT LEARNING IMPROVEMENT – 2.0T VEHICLES

SUBJECT:

CURRENT PROCEDURE

NEW PROCEDURE
Air bleeding