NHTSA ID Number: 10241890
Manufacturer Communication Number: 23-AT-012H
TSB/Document Date: 2023-09-06
Summary
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.
If the PDF is very large, it may not load in the preview below.
Some older TSBs had multiple PDFs — visit the NHTSA Website to view all PDFs.
If the TSB PDF does not show, download or view it on the NHTSA Website.
Click on the (+) Plus Sign
Then Click on Associated Document(s)
- Advanced VCI Box, Industry-leading J2534 Pass-Thru...
- High-Speed OEM-Level Diagnostics & Programming: Unlock true...
- Coverage for 17 Car Brands & Ultra Reliability: Works...
- User-Friendly RLink Platform & Expert Support: TOPDON’s...
- 6.6 ft USB-C Cable & Portable Storage Case: The RLink J...
This product presentation was made with AAWP plugin.
Search NHTSA Database for Recalls
Search NHTSA Database for Vehicle Investigations
View Latest Vehicle Investigations
Search NHTSA Database for Vehicle Complaints
View Latest Vehicle Complaints
TSB/Document ID: 23-AT-012H
Replacement Service Bulletin Number:
MFR Communication Date: 2023-08-28
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
GROUP
AUTOMATIC
TRANSMISSION
DATE
Technical Service Bulletin
SUBJECT:
AUGUST 2023
NUMBER
23-AT-012H
MODEL(S)
SANTA FE (TMa)
SONATA (DN8a)
SANTA CRUZ (NXT)
8-SPEED WET DCT TCU UPGRADE – TOUCH POINT LEARNING
IMPROVEMENT FOR 2.5T 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 ~ Santa Fe (TMa) 2.5T (VINs starting with “5NM”)
• 2021MY ~ Sonata (DN8a) 2.5T N-Line Trim (VINs starting with “5NP”)
• 2022MY ~ Santa Cruz (NXT) 2.5T
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 – 2.5T VEHICLES
Warranty Information:
MODEL
OP CODE
OPERATION
OP TIME
Santa Fe (TMa)
TCU Upgrade
Sonata (DN8a) with
(Before) +
954A0F02
N Line Trim
Vehicle
Santa Cruz (NXT)
Calibration
0.7 M/H
CAUSAL PART
954A1-2N250 (TMa)
954A1-2N060 (DN8a)
954A1-2N460(NXT)
NATURE CAUSE
CODE
CODE
S21
ZZ3
Santa Fe (TMa)
TCU Upgrade
954A1-2N251 (TMa)
Sonata (DN8a) with
(After) +
954A0F03
0.7 M/H 954A1-2N060 (DN8a)
S21
ZZ3
N Line Trim
Vehicle
954A1-2N460 (NXT)
Santa Cruz (NXT)
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.
TSB #: 23-AT-012H
Page 2 of 13
SUBJECT:
SUBJECT:
8-SPEED WET DCT TOUCH-POINT LEARNING IMPROVEMENT – 2.5T VEHICLES
Parts Information:
Before-Improvement 8WDCT
MODEL ENGINE
TYPE
2WD
Santa Fe
(TMa)
Theta
2.5T
SBW
4WD
Sonata
(DN8a)
with N
Line Trim
Theta
2.5T
SBW 2WD
Santa
Cruz
(NXT)
Theta
2.5T
SBC 4WD
T/M ASSY NO.
REMAN. PART
REMARK
430F0-2N085
N/A
with TCU
43000-2N034
LATEST TCU CAL ID
(EVENT #)
430F0-2N086
43000-2N034RM without TCU VTMPT25XXX900NSA
(#895)
N/A
with TCU
43000-2N035
43000-2N035RM without TCU
430F0-2N034
43000-2N050
430F0-2N081
43000-2N022
N/A
with TCU
VDN8T25XXX900NSC
(#896)
43000-2N050RM without TCU
N/A
with TCU
REMAN. PART
REMARK
WNX4T25X4X900NS9
(#897)
43000-2N022RM without TCU
After-Improvement 8WDCT
MODEL ENGINE
Santa Fe
(TMa)
Sonata
(DN8a)
with N
Line Trim
Theta
2.5T
Theta
2.5T
TYPE
T/M ASSY NO.
LATEST TCU CAL ID
(EVENT #)
2WD
43000-2N036
4WD
43000-2N037
43000-2N036RM without TCU VTMPT25XXW900NS1
(#920)
43000-2N037RM without TCU
SBW 2WD
43000-2N052
43000-2N052RM without TCU
SBW
Santa
Theta
Cruz
SBC 4WD 43000-2N029
2.5T
(NXT)
Note: SBC = Shift By Cable, SBW = Shift By Wire
TSB #: 23-AT-012H
N/A
without TCU
VDN8T25XXW900NS1
(#921)
WNX4T25X4W900NS1
(#922)
Page 3 of 13
SUBJECT:
8-SPEED WET DCT TOUCH-POINT LEARNING IMPROVEMENT – 2.5T VEHICLES
SUBJECT:
Service Procedure:
STUI
This TSB includes Repair validation photos. Refer to the latest Warranty Digital Documentation
Policy for requirements.
1. Refer to the flowchart below for overall procedure.
Vehicle In
Information
Vehicle requires
DCT replacement/
experiencing
drivability concerns
Please refer to standard HMA warranty
policy & procedures for DCT replacement.
NOTICE
Make sure that the TCU CAL ID
is the latest and matches the
corresponding part number,
otherwise shift shock may
occur.
Check 8WDCT P/N
BeforeImprovement
8WDCT
After-Improvement
8WDCT
If vehicle experiences
hesitation/jerking
during inspection,
perform T-P curve learning.
Perform TCU Upgrade
(#920-922)
-MANUAL MODE ONLY-
Perform TCU
Upgrade (#895-897)
Information
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
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-012H
Page 4 of 13
SUBJECT:
SUBJECT:
8-SPEED WET DCT TOUCH-POINT LEARNING IMPROVEMENT – 2.5T 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 6-7 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-012H
Page 5 of 13
SUBJECT:
8-SPEED WET DCT TOUCH-POINT LEARNING IMPROVEMENT – 2.5T VEHICLES
SUBJECT:
CURRENT PROCEDURE
NEW PROCEDURE
Air bleeding
Air bleeding
DCT
initialization
Transmission
initialization
- Stay Updated with Lifetime Access: This obd2 scanner includes lifetime free software updates for all app service functions. With a single payment, enjoy full access to diagnostics, reset tools, and maintenance features — zero subscription fees. A budget-friendly choice for weekend mechanics, home car owners, and DIYers, supporting vehicles from 1996 onward. Come to us with your VIN to check compatibility.
- Full Bidirectional Control/Active Tests & Stable Wireless Connectivity: This car code reader features full bidirectional control, allowing you to send commands to the vehicle's ECU for active tests on components such as fuel pumps, injectors, A/C clutches, windows, sunroofs, and more. This car scanner diagnostic tool helps DIYers quickly diagnose and test vehicle parts, cutting down troubleshooting and repair time. With BT 4.0 wireless connectivity, you can enjoy cable-free diagnostics up to 33 feet. Stand in your garage and test windows, wipers, or even engine components—all without needing to move around your car.
- Portable Car Scanner with 26 Resets: Scheduled vehicle maintenance with the A30M car diagnostic scanner can keep your vehicle in peak condition and save you big on dealership trips. The XTOOL A30M obd2 scanner diagnostic tool features essential reset and relearn functions, such as Oil Reset, EPB Reset (Electronic Parking Brake Release), SAS, ABS Brake Bleeding, Throttle Body Relearn, Injector Coding, Crank Sensor Relearn, Headlight Adjustment, and Tire Size Reset. Note: Service functions may vary by vehicle model – check compatibility beforehand!
- Wide Compatibility CAN FD & FCA
Autoauth: This obd2 scanner diagnostic tool is compatible with over 85+ car brands from the U.S., Europe, and Asia, providing extensive coverage through a BT connection with your smartphone or iPad. Now upgraded to support the latest protocols, it includes FCA AutoAuth access for Chrysler, Jeep, Dodge, and Fiat (2018+), and supports CAN FD for GM (2020+) models, giving you greater access to newer vehicles and systems. Note: The FCA AutoAuth account is not included with the device. Users must register and pay separately through the official FCA AutoAuth website to access diagnostic functions for vehicles that require it. - Up to 8 Live Data Streams Graphing – Real-Time Graphing for Deeper Insight: This car scanner supports up to 8 live data streams simultaneously with intuitive, real-time graphing. Gain comprehensive insights into your vehicle’s performance, making it easier to spot issues, detect trends, and make informed diagnostic decisions with confidence.
Autoauth: This obd2 scanner diagnostic tool is compatible with over 85+ car brands from the U.S., Europe, and Asia, providing extensive coverage through a BT connection with your smartphone or iPad. Now upgraded to support the latest protocols, it includes 
- Save $500+/Year with Pro-Level Diagnostics -No Subscriptions: The Portable XTOOL Anyscan A30D OBD2 scanner diagnostic tool includes free lifetime software updates for all app service functions, without extra cost. With a single payment, enjoy full access to diagnostics, relearn scan tools, and maintenance features. A cost-effective, smart choice for car owners and DIY enthusiasts, compatible with vehicles from 1996 onward. Please provide the car VIN and the special functions you need in advance so that we can confirm compatibility
- Bi-Directional Control for Faster Troubleshooting: Unlike a basic code reader, the A30D bi directional scan tool sends commands directly to your vehicle’s ECU to actively test components like fuel pump, valves, wipers, windows, doors, sunroof, and headlamps right from your smartphone. See component responses in real time without disassembly—perfect for brake jobs, electrical issues, and hard-to-find problems. This bidirectional obd2 scanner helps pinpoint faults faster, reduce guesswork, and avoid replacing good parts. An efficient, easy-to-use car scanner diagnostic tool built for DIYers, home garage users, and small-shop technicians who want real two-way scanner, not just codes
- 19 Reset Functions for Routine Maintenance: The A30D car diagnostic scanner provides 19 relearn functions without extra charges, including EPB Reset for parking brake replacement, TPMS Reset after tire changes, ABS Auto Bleeding, Oil Reset, SAS Reset, BMS Reset, Throttle Relearn, Injector C0ding, Gear Learning, Crank/Crankshaft/Cam/Ckp Sensor Relearn Tool, Transmission Match, Seat Calibration, Airbag Repair and more. This XTOOL A30D automotive scanner diagnostic tool supports preventive care, helping extend vehicle life and reduce costly shop visits. Functions vary by vehicle make and year—plz confirm compatibility before purchase
- Stable BT Connection & All-System & 8 Pids Live Data: The A30D wireless OBD2 scanner delivers a fast and stable wireless connection up to 33 feet, letting you move freely around the vehicle without tangled cables. Pair with with Android 9.0+ and iOS 10.0+ devices to turn your phone into a mobile auto scanner—perfect for home garages, driveways, or on-the-spot repairs. This full system scanner for cars provides real-time access to all major modules, including Engine, Gearbox, ABS, SRS, AC and more. with clear graphs, meters, and up to 8 PIDs displayed at once. This car code reader makes system monitoring visual, simple, easy to understand, and offering data logging for playback and deeper
- Wide Compatibility with CAN-FD & FCA Support: The A30D car computer diagnostic reader works with most 1996 and newer vehicles with a standard OBD2 port, including for Ford, for GM, for Toyota, for Honda, for Nissan,for Hyundai etc, with ongoing updates covering more car models and functions later. It also supports newer communication protocols like CAN-FD and FCA AutoAuth (Personal AutoAuth account and active subscription required, not included with the device!for Chrysler, for Dodge, for Jeep, for Fiat models). It is a future-ready automotive scanner diagnostic tool for households with multiple vehicles or part-time techs. Coverage vary by cars, plz check the compatibility first
- 2026 Latest Version – Now Upgraded from 32GB to 64GB: XTOOL D7 obd2 scanner diagnostic tool with bidirectional is designed for DIY enthusiasts, professional mechanics. It now offers 64GB storage for smoother operation. Its 5000mAh battery (with 2500mAh 7.3V fast-charging) supports all-day use. With FCA, CAN FD, and DOIP protocol support, it covers more vehicle models and newer systems. A newly added battery voltage reading shows battery status before diagnostics, helping prevent low-voltage tests that could harm the vehicle. The V2.0 Diagnostic Report allows shops to personalize results with logos, customer details, and attachments to build trust and maintain records.
- Save $500+/Year with Pro-Level Diagnostics: Whether you're a DIYer, starting a repair business, or beginning work at an auto shop, XTOOL D7 car scanner offers advanced features typically found only in expensive professional OBD2 scanners - without the high price tag. With 4,000+ Active Tests & Bidirectional Pids, 36+ Special Functions, advanced module resets like SRS Reset, OE-level All-System Scan (one-click), FCA AutoAuth, CAN FD, DoIP, data export, and 8 PIDs graphing, the D7 auto scan tool covers 100,000+ vehicles (excluding Indian models). Includes 3-Year updates and supports the XV200 endoscope to detect em!ssions and intermittent issues.
- Full Bidirectional Advantage Over Other Code Readers & Scan Tools: The XTOOL D7 automotive scanner offers true bidirectional control plus advanced bidirectional PIDs, letting you send commands to components like A/C clutches, fuel injectors, windows, fans and more, while monitoring sensor responses live to catch elusive issues (even those without warning lights). Unlike budget bidirectional obd2 scanners limited to basic active tests,the D7 car fault scanner gives you full bidirectional control to run ABS pump tests, throttle position, turn fan on/off and solenoid tests, etc. No guessing, no extra fees—just smarter diagnostics
- OE-Level Full System Car Diagnostic Scanner with 8 Live Data Graphs: The XTOOL D7 is a pro-grade diagnostic tool that gives you full access to all vehicle systems—just like Snap on scanners & the factory scan tools, it delivers deep, accurate diagnostics you can trust. Easily view live data streams, retrieve freeze frame, and run active tests to pinpoint issues fast. With the ability to graph up to 8 PIDs at once, you can spot performance trends and troubleshoot like a pro. Whether you're a mechanic or car owner, with the D7 auto scanner you can stay ahead of problems and keep your vehicle running at its best
- High-value Automotive Scanner Diagnostic Tool with 36+ Special Function, Module Resets, Relearns, Calibrations, Adaptations & Initializations: XTOOL D7 diagnostic tool packs 36+ common & advanced maintenance, skip the $150 fee for battery registration after replacement, throttle body relearn after cleaning, or TPMS resets post-rotation, Auto bleed after the pad changes, or Electronic Parking Brake. Need to reset the transmission after towing? Crank sensor relearn for GM/for Dodge? Done. D7 also covered advanced functions like Ad~blue Reset, VIN Write, and many more professional OBD2 scanner functions that we can't list here. Text us your VIN + what you need, we’ll check the compatibility
This product presentation was made with AAWP plugin.
Last update on 2026-05-12 / Affiliate links / Images from Amazon Product Advertising API