GROUP

NUMBER

CAMPAIGN

26-01-012G

DATE

Technical Service Bulletin

MODEL(S)

JANUARY 2026

G80 (RG3)

DCU SOFTWARE UPDATE
(SERVICE CAMPAIGN T73G)

SUBJECT:

This TSB supersedes 25-01-057G to add additional information for VCI 2 connection and
IP settings on pages 4-5.

 IMPORTANT
Retailers must perform this service campaign on all affected vehicles prior to retail delivery to a
guest and whenever an affected vehicle is in the shop for any maintenance or repair.
Access the “Vehicle Information” screen via WebDCS to identify open campaigns.
Description: Certain G80 (RG3) vehicles may exhibit a Data Communication Unit (DCU) software
error due to the internal timer initialization logic not being implemented. The DCU module may shut
down telematics services after one year. This bulletin provides instructions to perform a software
update for the DCU module.
Applicable Vehicles (Certain):
Model Year

Model

2025 – 2026

G80 (RG3)

Production Dates

06/03/2024 – 07/24/2025

SST Information:
Tool Name

Tool Number

VCI 3

G0VPNNN006

19-Pin Cable

Figure

Remarks

+

VCI 3 comes with
the 19-pin cable
(P/N G1XDDCA020
included here
for reference)

G1XDDCA020

Ordering Information

Website:
https://genesisessentialtools.com/
Email:
[email protected]

VCI 2
Ethernet
Communication
Interface (ECI)
Kit

G1XDDMN002

+
G0XDDMN052

If using VCI 2, the
ECI Kit will be
required to
complete software
updates.

Phone: 1-855-763-6630
Hours: 7 AM – 7 PM CST

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

SUBJECT:

DCU SOFTWARE UPDATE

GDS Information:

(SERVICE CAMPAIGN
)

T73G)

Model

System

Event Number*

Description

G80 (RG3)

DCU

1249

RG3 PE DCU LOGIC IMPROVEMENT

(*or use a later available event as listed in the GDS DCU Update screen if one is available.)
NOTE 1: The software update is subject to an OTA (Over-the-Air) option and may be completed by
customers with active Genesis Connected Services subscriptions.

Warranty Information:
Model

Op. Code

Operation

G80 (RG3)

50D218R0

DCU Software Update

Op. Time

Causal Part

0.4 M/H 96510-T1AC0

Nature
Code

Cause
Code

I14

ZZ3

NOTE 1: Submit claim on Claim Entry Screen as “Campaign” type.
NOTE 2: If a part is found in need of replacement while performing this campaign 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 3: This TSB includes repair validation photos. Op times include VIN, mileage, and photo
capture of the ECU Update "Success" screen as outlined in the Digital Documentation Policy.
ROM ID Information:
Model

Event

System

ECU
Part Number

G80 (RG3)

1249

DCU

96510-T1AC0

ROM ID
Current
120.NA.011509.011509

Latest

120.NA.011606.011606
120.NA.012054.012054
120.NA.011870.011870
120.NA.011951.011951

TSB #: 26-01-012G

Page 2 of 8
SUBJECT:

SUBJECT:

DCU SOFTWARE UPDATE

Service Procedure:

(SERVICE CAMPAIGN
)

T73G)

DIGITAL DOCUMENTATION
This TSB includes repair validation photos. Refer to the latest Warranty Digital Documentation
Policy for requirements.

NOTICE
You must initially perform the GDS ECU update in Auto Mode.
• If the ECU update starts but then fails in Auto Mode, perform the update in Manual Mode
to recover.

NOTICE
Ensure the vehicle’s battery charge is above 11.0 Volts and the tablet’s battery charge is above
30% before performing a software update to avoid update failure.

i

Information

•

Turn OFF all lamps (do NOT leave head lamp switch in auto mode) and all 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 #: 26-01-012G

Page 3 of 8
SUBJECT:

SUBJECT:

DCU SOFTWARE UPDATE

(SERVICE CAMPAIGN
)

T73G)

Configuration of Ethernet Communication on Tablet

VCI 2 Connection (must use ECI kit with USB-C cable attachment):
1.

Connect the ECI DLC connector to the OBD
connector of the vehicle.

2.

Connect the VCI to the receiver module on the
ECI cable.

3.

Connect the ECI cable with the USB-C
connector cable attachment to the tablet.

VCI 3 Connection (use VCI 3 cable):
1.

Connect the 19-pin connector to the bottom of
the VCI 3.

2.

Connect the VCI to the OBD connector of the
vehicle.

3.

Connect the cable with the USB-C connector
to the tablet.

i
•

Information
If using VCI 2, please wait for the Wi-Fi Direct timer to complete to ensure the Wi-Fi Direct
connection is established. Do NOT select Bluetooth Only.

TSB #: 26-01-012G

Page 4 of 8
SUBJECT:

SUBJECT:

DCU SOFTWARE UPDATE

(SERVICE CAMPAIGN
)

T73G)

ECU Update Procedure

1.

Enter the following digits exactly as shown for
IP address, DNS address, Netmask and
Default gateway.
Save and close.

i

Information

Ensure the following IP settings on your
tablet matches the below before
proceeding with the software update.

2.

Perform the ECU update in Auto Mode.

i

Information

Refer to TSB # 24-GI-016G, “ECU
Update Procedure for Tablet-Based
Genesis Smart”, for additional
information.

TSB #: 26-01-012G

Page 5 of 8
SUBJECT:

SUBJECT:

3.

DCU SOFTWARE UPDATE

(SERVICE CAMPAIGN
)

T73G)

Verify the ROM ID by selecting the DCU
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.

NOTICE
If the update fails, remove the power
connector from the in-cabin fuse box, or
disconnect the negative (-) battery
terminal for at least 5 seconds.
Reassemble and retry the update.

4.

After the ECU update process shows 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.

TSB #: 26-01-012G

Page 6 of 8
SUBJECT:

SUBJECT:

5.

DCU SOFTWARE UPDATE

OTA initialization (A) should perform
automatically:
• If OTA initialization performs
automatically, then proceed with the
service procedure.
•

(SERVICE CAMPAIGN
)

T73G)

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

6.

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.

TSB #: 26-01-012G

Page 7 of 8
SUBJECT:

SUBJECT:

DCU SOFTWARE UPDATE

(SERVICE CAMPAIGN
)

7.

Perform an All Systems Fault Code search
and erase DTC history that had incidentally
occurred from the ECU update.

8.

Start the engine to confirm proper operation of
the vehicle.

9.

The service procedure is now complete.

T73G)

NOTICE
If the ECU update fails in Auto Mode, perform the update in Manual Mode using the password(s)
below.
Manual Mode Password:
Event

EC U Menu

Password

1249

RG3 PE DCU 96510-T1AC0

9651

TSB #: 26-01-012G

Page 8 of 8
SUBJECT: