NHTSA ID Number: 11036199
Manufacturer Communication Number: 26-01-063G TSB
TSB/Document Date: 2026-08-15
Summary
Certain GV70 (JK1) vehicles may experience an intermittent A/C inoperative condition when the engine is started after the air conditioner has been operated with the ignition switch in the ON position. During engine cranking, a temporary low-voltage condition may cause the blower motor protection logic to activate, resulting in the A/C system turning OFF and remaining inoperative until the vehicle is restarted. This bulletin provides the procedure to update the ATCU (Air Temperature Control Unit) software to revise blower motor protection logic and prevent this condition from occurring.
GROUP
NUMBER
CAMPAIGN
26-01-063G
DATE
Technical Service Bulletin
MODEL(S)
AUGUST 2026
GV70 (JK1)
AC NOT TURNING ON - ATCU SOFTWARE UPDATE
(LIMITED COVERAGE CAMPAIGN L21G)
SUBJECT:
IMPORTANT
Retailers must perform this field action on all affected vehicles within 5 / 60,000 New Vehicle Limited
Warranty (NVLW) prior to retail delivery to a guest and whenever an affected vehicle is in the shop
for any maintenance or repair. See Warranty Information section for more details.
Access the “Vehicle Information” screen via WebDCS to verify “Warranty Start Date” and ensure the
vehicle is within NVLW, observing mileage prior to any repair work.
Description: Certain GV70 (JK1) vehicles may experience an intermittent A/C inoperative condition
when the engine is started after the air conditioner has been operated with the ignition switch in the
ON position. During engine cranking, a temporary low-voltage condition may cause the blower motor
protection logic to activate, resulting in the A/C system turning OFF and remaining inoperative until
the vehicle is restarted. This bulletin provides the procedure to update the ATCU (Air Temperature
Control Unit) software to revise blower motor protection logic and prevent this condition from
occurring.
Applicable Vehicles (Certain):
Model Year
Model
Production Dates
2027
GV70 (JK1)
05/19/2026 – 07/09/2026
SST Information:
Tool Name
Tool Number
VCI 3
G0VPNNN006
Figure
Ordering Information
Website:
https://genesisessentialtools.com/
Email:
[email protected]
VCI 2
G1XDDMN002
Phone: 1-855-763-6630
Hours: 7 AM – 7 PM CST
NOTE: VCI 2 can NO longer be ordered but can be used for the updates in this TSB.
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair
SUBJECT:
AC NOT TURNING OFF
- ATCU SOFTWARE UPDATE
(LIMITED COVERAGE CAMPAIGN L21G)
GDS Information:
Model
System
Event Number*
Description
GV70 (JK1)
AIRCON
1512
JK PE ATCU LOGIC IMPROVEMENT
(*or use a later available event as listed in the GDS AIRCON Update screen if one is available.)
Warranty Information:
Model
Op. Code
Operation
Op. Time
Causal Part
Nature
Code
Cause
Code
ATCU Software
0.3 M/H
97255-ARFE0
I14
ZZ3
Update
NOTE 1: Submit a campaign claim on the "Claim Entry/Edit/Submit" screen on WebDCS and attach
all required Digital Documentation per TSB to the claim.
NOTE 2: 5 / 60,000 New Vehicle Limited Warranty (NVLW) applies to the part(s) and repair
procedure(s) outlined in this TSB. Prior to beginning any repair work, ensure the part(s) associated
with the repair procedure are within NVLW, observing mileage and Warranty Start Date or date of first
use. If the subject part(s) are out of warranty coverage, the retailer has the option to submit a PA
Request for goodwill consideration on a case-by-case basis.
NOTE 3: 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 retailer 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 retailer has the option to submit a PA Request for goodwill consideration on a case-by-case basis.
NOTE 4: This TSB includes repair validation photos. Op times include VIN, mileage, and photo
capture of the ECU Update “Success” result screen as outlined in the Digital Documentation Policy.
GV70 (JK1)
60D208R1
ROM ID Information:
Model
Event
System
GV70 (JK1)
1512
AIRCON
TSB #: 26-01-063G
ECU
Part Number
97255-ARFE0
97255-ARFF0
ROM ID
Current
Latest
1.09.00
1.10.00
1.10.02
Page 2 of 6
SUBJECT:
AC NOT TURNING OFF
- ATCU SOFTWARE UPDATE
(LIMITED COVERAGE CAMPAIGN L21G)
Service Procedure:
DIGITAL DOCUMENTATION
This TSB includes repair validation photos. Refer to the latest Warranty Digital Documentation
Policy for requirements.
NOTICE
Perform the GDS ECU update in Auto Mode.
•
If the ECU update fails in Auto Mode, perform the update in Manual Mode to recover.
NOTICE
Ensure the vehicle's battery charge is ≥12.3 Volts and the tablet's battery charge is above 30%
before performing a software update, to avoid update failure. Hyundai
recommends connecting a
battery maintainer/charger when performing all ECU updates.
i
Information
•
Turn OFF all lamps (do NOT leave head lamp switch in auto mode) and accessories.
•
Perform update with the ignition switch in the ON position.
•
Do NOT disconnect any cables connected to the vehicle or scan tool during the update.
•
Do NOT start the engine during the update.
•
Do NOT turn OFF the ignition switch during the update.
TSB #: 26-01-063G
Page 3 of 6
SUBJECT:
AC NOT TURNING OFF
- ATCU SOFTWARE UPDATE
(LIMITED COVERAGE CAMPAIGN L21G)
ECU Update Procedure
1.
Perform the ECU update in Auto Mode.
i
Information
Refer to TSB # 25-GI-020G, “ECU
Update Procedure for Tablet-Based
Genesis Smart”, for additional
information.
2.
Verify the ROM ID by selecting the AIRCON
system to scan the vehicle’s current ROM ID.
NOTICE
Check the current ROM ID version and
compare it to the ROM ID Information
table before attempting to perform the
software update.
If the update fails, remove the power
connector from the in-cabin fuse box for
at least 5 seconds. Reassemble and
retry the update.
TSB #: 26-01-063G
Page 4 of 6
SUBJECT:
3.
AC NOT TURNING OFF
- ATCU SOFTWARE UPDATE
(LIMITED COVERAGE CAMPAIGN L21G)
Once the ECU update is 100% complete,
follow the prompts on the screen to cycle the
ignition OFF for at least 10 seconds to reset
the control unit (certain models may take up to
30 seconds).
i
Information
Use the Refresh button to reset the
timer.
4.
OTA initialization (A) should perform
automatically:
• If OTA initialization performs
automatically, then proceed with the
service procedure.
•
A
If the OTA initialization process fails,
complete it manually under:
S/W Management > CCU_CCNF Central Communication Unit (CCNF)
> OTA Initialization (B).
Follow the instructions on the screen.
B
TSB #: 26-01-063G
Page 5 of 6
SUBJECT:
5.
AC NOT TURNING OFF
- ATCU SOFTWARE UPDATE
(LIMITED COVERAGE CAMPAIGN L21G)
DIGITAL
DOCUMENTATION
Using the tablet or GDS screen capture
function, take a screenshot of the ECU
Update “Success” result screen.
Upload the photo to STUI.
NOTE: The VIN/Date/Time/Mileage photo
imprint is NOT required for GDS
screenshots.
6.
Perform an All Systems Fault Code search
and erase DTC history that had incidentally
occurred from the ECU update.
7.
Start the engine to confirm proper operation of
the vehicle.
8.
The service procedure is now complete.
NOTICE
If the ECU update fails in Auto Mode, perform the update in Manual Mode using the password(s)
below.
Manual Mode Password:
Event
Menu
Password
1512
JK PE ATCU 97255-ARAE0/AF0/AG0/AH0/BE0/BF0/BG0/BH0/KA0/KB0/K
C0/KD0/KE0/KF0/KG0/KH0/KJ0/KK0/KL0/KM0/KN0/KP0/KQ0/KR0/DE0/D
F0/EE0/EF0/EG0/EH0/FE0/FF0/HJ0/HK0/HL0/HM0/HN0/HP0/HQ0/HR0/L
A0/LB0/LC0/LD0/LE0/LF0/LG0/LH0/LJ0/LK0/LL0/LM0/LN0/LP0/LQ0/LR0
5175
TSB #: 26-01-063G
Page 6 of 6
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TSB/Document ID: 26-01-063G TSB
Replacement Service Bulletin Number:
MFR Communication Date: 2026-08-03
MFR Internal Campaign ID/Software Version: L21G
Communication Type: Warranty Program/Extension
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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