GROUP

NUMBER

HYBRID
CONTROL

Technical Service Bulletin

DATE

23-HC-002H
MODEL(S)

AUGUST 2023

SONATA HYBRID
(DN8 HEV)

ECU UPDATE AND GDS-M ‘INTEGRATED THERMAL MODULE
COOLANT FILLING MODE’

SUBJECT:

Description: This bulletin provides information related to the Engine Control Module (ECM) software
update and coolant replacement for 2020-2023MY Sonata Hybrid (DN8 HEV) vehicles to improve the
coolant filling mode by discharging air bubbles.
Applicable Vehicles : All 2020-2023MY Sonata Hybrid (DN8 HEV) with exhaust heat recovery system.
GDS Information:
Event #
924

Description
DN8 HEV COOLANT A/S FILLING MODE

(*or use a later available event as listed in the GDS ECM Update screen if one is available.)

NOTICE

GDS Vehicle Battery Voltage Warning:
If voltage is below 12 volts as per the GDS warning, then
select Back and run the engine at least 15 minutes to reach
an adequate battery state of charge to prevent ECU Update
failure. Cycle the ignition OFF/ON before retrying ECU
update again.

Warranty Information:
Model

Sonata
Hybrid
(DN8 HEV)

Op. Code

Operation

Op.
Time

Casual Part

07100F12

ECU Update and GDS-M
‘Integrated Thermal Module
Coolant Filling Mode’ Function

0.9
M/H

39116-2J002

07100F13

GDS-M ‘Integrated Thermal
Module Coolant Filling Mode’
Function
(for Vehicles With
Updated ECU)

0.5
M/H

Nature
Code

Cause
Code

I3A

ZZ3

39116-2J002

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

SUBJECT: ECU UPGRADE AND GDS-M ‘INTEGRATED THERMAL MODULE COOLANT FILLING MODE’

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 includes VIN, mileage, and 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
ROM ID Information Table:
Model

TM

IMMO

39116-2J002
DN8 HEV

6AT

+IMMO

ROM ID

ECU P/N

Old
HDN80NS0AQ30RC00
HDN80NS0AQ470C00

New
HDN80NS0AQ780C00

HDN81NS0AQ10SC00
39116-2J012

HDN81NS0AQ20TC00

HDN81NS0AQ680C00

HDN81NS0AQ370C00
39116-2J013

HDN82NS0AQ370C00

HDN82NS0AQ680C00

If the automatic ECU update process fails, cycle the ignition key to OFF for at least 30 seconds to
reset the control unit. Then resume programming using the Manual ECU Update process.
After the ECU update process shows 100% complete, cycle the ignition key again to OFF for at
least 30 seconds to reset the control unit. This step is important for establishing normal powertrain
communication and to prevent system errors.

Manual Update:
Model
Event
DN8 HEV

924

Menu
DN8 HEV 6AT +IMMO 39116-2J002
DN8 HEV 6AT +IMMO 39116-2J012
DN8 HEV 6AT +IMMO 39116-2J013

Password
2002
2012
2013

NOTE: After the ECU update has been completed:
• Clear any ECM DTC(s) after the ECU update.
• Start the engine to confirm proper operation of the vehicle.

TSB #: 23-HC-002H

Page 2 of 13
SUBJECT:

SUBJECT: ECU UPGRADE AND GDS-M ‘INTEGRATED THERMAL MODULE COOLANT FILLING MODE’

Service Procedure:

STUI
This TSB includes Repair validation photos. Refer to the latest Digital Documentation Policy for
requirements.
Perform the service procedure referring to the flow chart below.

NOTES:
• Refer to TSB 15-GI-001 for additional tablet-based Mobile GDS ECU update information.
• After the ECU Upgrade process shows 100% complete, cycle the ignition key to OFF for at
least 30 seconds to reset the control unit. This step is important for establishing normal
powertrain communication and to prevent system errors.
• Clear DTC(s) present after the ECU update.
• Start engine to confirm proper operation of the vehicle.

TSB #: 23-HC-002H

Page 3 of 13
SUBJECT:

SUBJECT: ECU UPGRADE AND GDS-M ‘INTEGRATED THERMAL MODULE COOLANT FILLING MODE’

GDS-M Integrated Thermal Module Coolant Filling Mode Function
1.

! CAUTION
Before starting the ‘Coolant Filling Mode’
procedure, Make sure ROM ID is latest
version.

A

! CAUTION
Never remove the radiator cap when
the engine is hot. Serious scalding could
occur by hot fluid escaping under high
pressure from the radiator.
Make sure the engine and radiator are cool to
the touch, then open the reservoir tank cap
(A), supplement the coolant, and reinstall the
reservoir cap.
Refer to Shop Manual:
Engine Mechanical System > Cooling
System > Coolant > Repair procedures
2.

After turning ENG ON, connect the GDS
diagnostic device.

3.

Place the gear in P (Park) position and engage
the emergency brake.

4.

Turn off the A/C and set the air conditioning
temperature and the number of blowers to
maximum.

5.

Select ‘S/W Management’ (B).

B

TSB #: 23-HC-002H

Page 4 of 13
SUBJECT:

SUBJECT: ECU UPGRADE AND GDS-M ‘INTEGRATED THERMAL MODULE COOLANT FILLING MODE’

6.

Select the ‘Integrated Thermal Module
Coolant Filling Mode’ (C).

C

7.

After checking the ‘Purpose’ and ‘Enable
Condition’, press ‘OK’ to proceed.

TSB #: 23-HC-002H

Page 5 of 13
SUBJECT:

SUBJECT: ECU UPGRADE AND GDS-M ‘INTEGRATED THERMAL MODULE COOLANT FILLING MODE’

8.

Check the items listed under Condition and
press ‘OK’.

9.

If the phrase “ECU please try again after
updating the nECU latest Rom” appears, then
the ECU version must be updated to V80 or
higher (current version: V70).
•

Refer to TSB 15-GI-001 for additional
tablet-based Mobile GDS ECU update
information.

If ECU Update is not required, skip to step 11.

TSB #: 23-HC-002H

Page 6 of 13
SUBJECT:

SUBJECT: ECU UPGRADE AND GDS-M ‘INTEGRATED THERMAL MODULE COOLANT FILLING MODE’

10.

If ECU required updating in step 9, a STUI
picture is required.

STUI
Take a screenshot of the ECU Update
Complete screen using your particular
tablet’s screenshot save method and
upload to STUI.

11.

Check the items listed in Function Sequence,
then verify the following:
• Coolant temperature of 98°F (36.75°C)
• A/C OFF state
• Transmission in “P” (Park)

OFF

TSB #: 23-HC-002H

Page 7 of 13
SUBJECT:

SUBJECT: ECU UPGRADE AND GDS-M ‘INTEGRATED THERMAL MODULE COOLANT FILLING MODE’

12.

With transmission in P (Park), step on the
accelerator pedal and raise it to 4,700 rpm or
more, then lower it to 1,500 rpm or less.
Repeat 10 times and check the amount of
coolant in the reservoir tank before
replenishing. (Follow instructions on GDS as
shown at right.)

TSB #: 23-HC-002H

Page 8 of 13
SUBJECT:

SUBJECT: ECU UPGRADE AND GDS-M ‘INTEGRATED THERMAL MODULE COOLANT FILLING MODE’

13.

Wait until AEWP racing is automatically
performed 50 times.

TSB #: 23-HC-002H

Page 9 of 13
SUBJECT:

SUBJECT: ECU UPGRADE AND GDS-M ‘INTEGRATED THERMAL MODULE COOLANT FILLING MODE’

14.

With transmission in P (Park), step on the
accelerator pedal and raise it to 4,700 rpm or
more, then lower it to 1,500 rpm or less.
Repeat 10 times and check the amount of
coolant in the expansion bottle before
replenishing. (Follow instructions on GDS as
shown at right.)

TSB #: 23-HC-002H

Page 10 of 13
SUBJECT:

SUBJECT: ECU UPGRADE AND GDS-M ‘INTEGRATED THERMAL MODULE COOLANT FILLING MODE’

15.

Wait until AEWP racing is automatically
performed 10 times.

16.

With transmission in P (Park), step on the
accelerator pedal and raise it to 4,700 rpm or
more, then lower it to 1,500 rpm or less.
Repeat 10 times and check the amount of
coolant in the expansion bottle before
replenishing. (Follow instructions on GDS as
shown at right.)

TSB #: 23-HC-002H

Page 11 of 13
SUBJECT:

SUBJECT: ECU UPGRADE AND GDS-M ‘INTEGRATED THERMAL MODULE COOLANT FILLING MODE’

TSB #: 23-HC-002H

Page 12 of 13
SUBJECT:

SUBJECT: ECU UPGRADE AND GDS-M ‘INTEGRATED THERMAL MODULE COOLANT FILLING MODE’

17.

When the phrase “Ends the additional function”
appears on the diagnostic device, check the
amount of coolant and reinstall the reservoir
tank cap.

STUI
Take a screenshot of the 'Integrated
flow control valve (ITM) coolant filling
mode has been completed' screen
using your particular tablet's
screenshot save method and upload to
STUI.

18.

Procedure is complete.

TSB #: 23-HC-002H

Page 13 of 13
SUBJECT: