GROUP

NUMBER

CAMPAIGN
DATE

Technical Service Bulletin
SUBJECT:

APRIL, 2023

23-01-035H
MODEL(S)
SANTA FE HYBRID
(TMa HEV)

ECU UPGRADE – G2T-GDI DTC MISDIAGNOSIS & OIL DILUTION
IMPROVEMENT (SERVICE CAMPAIGN T9X)

 IMPORTANT
Dealers must perform this service campaign on all affected vehicles prior to customer retail
delivery 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: This bulletin provides information related to the Engine Control Module (ECM)
software update for HMMA (5NM) produced 2023MY Santa Fe Hybrid (TM HEV) vehicles to improve
the following DTC and symptoms:
1. P1441 (EVAP System Flow During Non-Purge Condition)
a. Misdiagnosis due to insufficient margin of pressure deviation when driving at constant
speed with low engine load
i.
Logic improvement to eliminate misdiagnosis
2. P1A77 (Check Generator Belt)
a. Misdiagnosis due to poor synchronization release when the engine is stopped
i.
Logic improvement to release synchronization even if CAM signal is active
when engine is stopped
3. P00B7 (Engine Coolant Flow Low/Performance)
a. ITM control error due to temporary ball valve stuck
i.
Improvement to ITM cleaning logic (1 time -> 5 times)
4. P2118 (Throttle Actuator Control Motor Current Range/Performance) / P0401 (EGR Flow
Insufficient Detected)
5. P0236 (Turbocharger System Boost Sensor A Circuit Range/Performance) / P0299
(Turbocharger underboost)
a. Failure due to EGR condensate freezing
i.
Change the EGR Flow diagnosis condition (-40℃ → -7℃)
6. Oil Dilution: Some vehicles may experience increased oil consumption and white smoke due to
the diluting of engine oil with fuel because of the frequent transition between EV ↔ Engine
mode during the winter season
a. Modify fuel injection strategy below 10℃ and add oil heating function based on the
driving pattern.
7. P2B60 (Engine Coolant Flow Control Valve Position Sensor Circuit Range/Performance)
a. Ball valve stuck escape mode logic improvement
i.
Change the Mas. Angle in the reverse direction when operating the escape
mode (5 → 35 degrees)

Circulate To: Service Manager, Warranty Manager, Service Advisors, Technicians, Fleet Repair

SUBJECT:

ECU UPGRADE – G2T-GDI DTC MISDIAGNOSIS & OIL DILUTION IMPROVEMENT (SERVICE CAMPAIGN T9X)

APPLICABLE VEHICLES: Certain 2023MY “5NM” Santa Fe Hybrid (TMa HEV) equipped with 1.6L
engines and produced from 10/10/2022 – 01/12/2023.

GDS INFORMATION: System Selection: Engine:
Event #
Description
TM
(P)HEV
GAMMA2
T-GDI
DTC
MISDIAGNOSIS
& OIL DILUTION IMPROVEMENT (ECU)
#909
PARTS INFORMATION:
Part Name

Part Number

Engine Control Unit

Quantity

39131-2MTL0

1

Remarks
Only order if ECU is
unrecoverable using Manual
Mode after a failed Auto Mode
update.

WARRANTY INFORMATION:
Model

“5NM” Santa Fe
Hybrid (TMa HEV)

Op Code

Operation

30D180R0 ECU UPGRADE

Op
Time
0.3
M/H

ECU
0.3M
30D180R1
REPLACEMENT /H

Causal Part

Nature
Code

Cause
Code

39131-2MTL0

I3T

ZZ3

NOTE 1: Submit claim on Campaign Claim Entry Screen.
NOTE 2: If a part that is not covered by this campaign is found in need of replacement
while performing this service 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: ECU Replacement is only necessary if ECU crashes during the update. Make
sure to follow all precautions outlined below to prevent ECU damage.

NOTICE
To verify the vehicle is affected, be sure to check the version of the vehicle’s ECU
ROM ID with reference to the ECU ROM ID TABLE below before attempting to upgrade
the control unit software.
You must attach a 12V battery charger to the vehicle before performing GDS ECU
Update. This is to prevent a battery saver condition from occurring since Santa Fe
Hybrid uses a smaller battery.
You must initially perform GDS ECU Update in Auto Mode.
• If the ECU Update starts but then fails in Auto Mode, disconnect the battery cables and
touch the cables together for one minute. Reconnect the battery cables, attach a battery
charger and perform the update in Manual Mode to recover.
• Refer to the General Instructions found in TSB 15-GI-001 (GDS Mobile).
TSB #: 23-01-035H

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SUBJECT:

ECU UPGRADE – G2T-GDI DTC MISDIAGNOSIS & OIL DILUTION IMPROVEMENT (SERVICE CAMPAIGN T9X)

SERVICE PROCEDURE:
1. CAUTIONS DURING CONTROL UNIT UPGRADE
a. Turn off all lamps(Do not leave head lamp switch in auto mode.) and all
accessories(including heater, A/C, blower, radio, seat warmer, defroster, etc.),
do not allow the battery to be discharged during upgrade.
b. Perform upgrade with the ignition switch in the ON position.
c. Be careful not to disconnect any cables connected to the vehicle or scan tool
during upgrade.
d. Do not start the engine during upgrade.
e. Do not turn off the ignition switch during upgrade.
2. After the ECU Update is completed, check for Diagnostic Trouble Codes and erase
any DTC.
ECU ROM ID TABLE:
Model

Part Number

Santa Fe
Hybrid
(TMa HEV)

39131-2MTL0

ROM ID
Old
JTMA3NS06F087F00
JTMA3NS06F188F00

New
JTMA3NS06F288F00

MANUAL UPDATE: If the ECU Update starts but then fails in Auto Mode, perform the
update in Manual Mode to recover.
Model
Santa Fe Hybrid
(TMa HEV)

Event

Menu

#909 TMA PE HEV 1.6T-GDI 6AT 4WD 23MY 391312MTL0

TSB #: 23-01-035H

Password
9131

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