21-AT-012G

GROUP
AUTOMATIC
TRANSMISSION
DATE
Technical Service Bulletin
JULY, 2021
NUMBER
21-AT-012G
MODEL(S)
G70 (IK), G80 (DH),
G80 (RG3), GV70
(JK1), GV80 (JX1),
G90 (HI)
AUTOMATIC TRANSMISSION OIL PRESSURE DATA TRANSFER –
GDS MOBILE (8-SPEED TRANSMISSION)
SUBJECT:
This TSB supersedes TSB 19-AT-007G to add additional models.
DESCRIPTION:
This bulletin provides a procedure to transfer oil pressure data to the TCU using GDS Mobile. This
procedure is necessary to reduce the TCU learning time and improve the shift quality.
 Before replacing an automatic transmission (Pages 2~3): Input the data from the new
transmission into the TCU using the GDS.
 Before replacing a TCU (Pages 4~6): Back up the oil pressure data from the old TCU into the
GDS and then transfer the data to the new TCM.
NOTICE
Before installing a transmission, use the GDS to transfer the pressure characteristics
from the new transmission to the TCU. If not possible, take a photo of the new tag or
record all digits on the new tag. The barcode tag is difficult to read after installation.
The oil pressure characteristics barcode tag location is shown below.
8-Speed
APPLICABLE VEHICLES:
2019~
2019~20
2021~
G70 (IK)
G80 (DH)
G80 (RG3)
2019~
2021~
2022~
G90 (HI)
GV80 (JX1)
GV70 (JK1)
WARRANTY INFORMATION: Normal warranty applies.
NOTE: Labor operation for automatic transmission or TCU replacement includes the time for data
transfer.
Circulate To: Service Manager, Warranty Manager, Service Advisors, Technicians, Fleet Repair
SUBJECT:
I.
AUTOMATIC TRANSMISSION OIL PRESSURE DATA TRANSFER
OIL PRESSURE DATA INPUT – BEFORE REPLACING AUTOMATIC TRANSMISSION
Oil pressure data input procedure using GDS Mobile
1. Turn the ignition on and place the shift lever in P.
From the GDS Mobile home screen, select S/W
Management.
Select Automatic Transaxle.
Select Oil pressure characteristics input (A/T
Replacement).
Select OK and follow the prompts.
2. Use the QR Reader to read the barcode tag on the
transmission. Select OK and follow the prompts.
The GDS will transfer the data to the TCU.
NOTE: If the QR Reader did not successfully read
the barcode, select SERIAL INPUT. Go to Step 3.
TSB #: 21-AT-012G
Page 2 of 6
SUBJECT:
AUTOMATIC TRANSMISSION OIL PRESSURE DATA TRANSFER
3. If the QR Reader did not successfully read the
barcode, input the barcode data manually.
Select OK.
The GDS will confirm the oil pressure
characteristics were input in the TCU. Select OK.
4. After repairs are complete, check for DTC and delete any DTC.
5. Reset the automatic transmission adaptive
values using GDS, S/W Management menu and
Resetting Auto T/A Values. Follow the prompts
on the GDS.
6. Relearn the adaptive values using GDS, S/W
Management menu and AT Adaptation Mode.
Follow the prompts on the GDS.
TSB #: 21-AT-012G
Page 3 of 6
SUBJECT:
AUTOMATIC TRANSMISSION OIL PRESSURE DATA TRANSFER
II. OIL PRESSURE DATA INPUT - BEFORE REPLACING OR EXCHANGING A TCU
Oil pressure data Backup and Input procedure using GDS Mobile
NOTICE

Before replacing a TCU, use this procedure to back up the oil pressure
characteristics.

If the TCU has been replaced and the oil pressure data has not been input to the
new TCU, the shift position indicator lamps on the instrument cluster or shift lever will
blink with the ignition on and the engine off.
1. Turn the ignition on and place the shift lever in P.
From the GDS Mobile home screen, select S/W
Management.
Select Automatic Transaxle.
Select Oil Pressure Characteristics BackUp &
Input (TCU Replacement).
Select OK and follow the prompts.
TSB #: 21-AT-012G
Page 4 of 6
SUBJECT:
AUTOMATIC TRANSMISSION OIL PRESSURE DATA TRANSFER
2. The GDS will prompt you to back up the
pressure characteristics to the GDS. Select
Backup.
The GDS will confirm the oil pressure
characteristics of the old TCU was backed up in
the GDS. Select OK.
Turn the ignition off and install the new TCU.
NOTICE
If the GDS cannot communicate with the old TCU, install the new TCU and go to Page 2, step
2 and input the oil pressure data using SERIAL INPUT.
3. Turn the ignition on. From the GDS Mobile
home screen, select S/W Management.
Select Automatic Transaxle.
Select Oil Pressure Characteristics Backup
& Input (TCU Replacement). Select OK and
follow the prompts.
Select Input.
TSB #: 21-AT-012G
Page 5 of 6
SUBJECT:
AUTOMATIC TRANSMISSION OIL PRESSURE DATA TRANSFER
4. The GDS will prompt you to input the oil
pressure characteristics to the new TCU.
Select OK.
The GDS will confirm the oil pressure
characteristics were input to the new TCU.
5. Drive the vehicle and confirm proper operation
of the transmission.
TSB #: 21-AT-012G
Page 6 of 6