GROUP

NUMBER

CAMPAIGN

Technical Service Bulletin

DATE
March, 2021

21-01-017H
MODEL(S)
Elantra (CN7/CN7a)

IVT DAMPER CLUTCH LOGIC UPDATE
(SERVICE CAMPAIGN T6B)

SUBJECT:

 IMPORTANT

*** Dealer Stock and Retail Vehicles ***
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.
When a vehicle arrives at the Service Department, access Hyundai Motor America's “Vehicle
Information Screen (VIS)" via WEBDCS to identify open Campaigns.
Description: This bulletin provides the service procedure to update the Transmission Control Unit (TCU)
software for certain Elantra (CN7/CN7a) vehicles equipped with the 2.0L MPI and Intelligent Variable
Transmission (IVT). This update to the damper clutch logic is to address a potential engine stall condition
immediately following Forward Collision Avoidance (FCA) activation under specific operating conditions
at low engine RPM and low vehicle speeds. In the event a low-speed stall does occur, the engine can
immediately be restarted.
Applicable Vehicles: Certain 21MY Elantra (CN7/CN7A) vehicles equipped with 2.0L MPI IVT
ROM ID:
Vehicle

ROM ID
Engine

TM

PCU P/No.

OLD

NEW

39171-2JCB5
39173-2JCB0
Elantra (CN7)

39171-2JCC0
39171-2JCC5
2.0L MPI

IVT

39173-2JCC0
39171-2JBD5

Elantra (CN7a)

CCN0N20NS0
CCN0N20NS1 CCN0N20NS5
CCN0N20NS2

39171-2JBE0
39171-2JBB5
39171-2JBC0

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

SUBJECT:

IVT DAMPER CLUTCH LOGIC UPDATE (SERVICE CAMPAIGN T6B)

GDS Information:
System Selection: TRANSMISSION CONTROL UNIT (TCU)
Event #
Description
677
677.CN7/CN7a -TCU LOGIC IMPROVEMENT FOR IVT OPERATION
(*or use a later available event as listed in the GDS TCU Update screen if one is available.)
Warranty Information:
Model

Op. Code

Operation

Op. Time

Causal Part

Causal
Code

Nature
Code

Elantra (CN7)

10D035R0

TCU UPGRADE

0.3 M/H

39171-2JCB5

T72

ZZ3

Elantra
(CN7a)

10D035R1

TCU UPGRADE

0.3 M/H

39171-2JBD5

T72

ZZ3

Note 1: Submit Claim on Campaign Claim Entry Screen
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 warranty 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.

CAUTION

!
1.
2.
3.
4.
5.
6.

Verify the vehicle battery has reasonable charge.
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 update.
Do not start the engine during update.
Do not turn off the ignition switch during update.
!

WARNING

GDS-M Vehicle Battery Low Voltage Warning:
When the vehicle battery is lower than 12 volts, the GDS-M will trigger a Low Battery Voltage
Warning. If this Warning occurs,
A. Connect the battery to a fully charged battery jump pack or GR8 charger using “Power Supply
Mode” to continue the software update.
OR
B. Select “BACK” to exit the SW update. Then, start the engine and idle with the headlights on for
20 minutes. Return to the SW update after charging the battery.

NOTICE
Perform the update in Auto Mode. If the automatic update is unsuccessful, perform the Manual
Update Procedure.
TSB #: 21-01-017H

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SUBJECT:

SUBJECT:

IVT DAMPER CLUTCH LOGIC UPDATE (SERVICE CAMPAIGN T6B)

Service Procedure
A. Automatic Update Procedure
1.

Perform the GDS-M software update per TSB 15-GI-001.

2.

Reset the TCU adaptive learning values.

3.

Start the engine to confirm the proper operation of the vehicle.

B. Manual Update Procedure

NOTICE
Only perform the manual update procedure if the automatic update procedure is unsuccessful.
If the automatic upgrade is unsuccessful, turn the ignition off for about 10 seconds. Turn the
ignition back on and reset the control unit before performing the manual update.
1.

From the GDS-M home screen, select ECU Upgrade.

2.

From the ECU Upgrade screen, select
Manual Mode, then select the Update Event
677.
Update Event
677.CN7/CN7a-TCU LOGIC IMPROVEMENT
FOR IVT OPERATION

3.

A password prompt will appear. Enter the password and select Upgrade.
MENU

PASSWORD

CN7/CN7a 2.0MPI TCU 39171/3-2JCB0/CB5/CC0/CC5/BD0/BD5/BE0/BE5/BB0/BB5/BC0/BC5

3917

4.

The update will occur.

5.

Once the update finishes, turn the ignition off for 10 seconds, then turn the ignition back on.
Check if any Diagnostic Trouble Codes (DTCs) were created by the update, and clear all
related DTCs.

6.

Reset the TCU adaptive learning values.

7.

Start the engine to confirm the proper operation of the vehicle.

8.

The service procedure is now complete.

TSB #: 21-01-017H

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