GROUP
AUTOMATIC
TRANSMISSION
DATE

Technical Service Bulletin
May, 2020

SUBJECT:

NUMBER
20-AT-019H
MODEL
SONATA (LFa)
SANTA FE (TMa)
PALISADE (LX2)
SONATA (DN8)

AUTOMATIC TRANSMISSION (8-SPEED FRONT-WHEEL DRIVE)
HARSH AND/OR DELAYED SHIFTS – GDS ANALYSIS

This TSB supersedes TSB 18-AT-003 to add additional models.
DESCRIPTION: If you are servicing any of the vehicles listed below with a harsh and/or delayed shift,
use the GDS as shown in the Service Procedure to measure shift engagement time.
APPLICABLE VEHICLES:
2018~19 Sonata (LFa) 2.0T
2020~
Sonata (DN8) 1.6T/2.5L
2019~
Santa Fe (TMa) 2.0T/2.4L
2020~
Palisade (LX2) 3.8L
WARRANTY INFORMATION: Normal warranty applies
SERVICE PROCEDURE:
1.

Attach the GDS and check for Diagnostic Trouble Codes in both the “Engine” and “Automatic
Transaxle” menu. If DTCs are found, repair according to the appropriate TSB or shop manual.

2.

Check the ATF level when the engine is idling in “P” and the ATF is 122°~140°F (50°~60°C)
according to the related shop manual. Adjust the ATF level as needed using SP4-M ATF.

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

SUBJECT:

AUTOMATIC TRANSMISSION HARSH AND/OR DELAYED SHIFTS

3.





Attach the GDS.
From the home screen, select Flight Record. Select the VIN and A/T menu. Select OK.
Select the following parameters and select Next.

4



Select 10 minutes recording time and Manual Trigger. Insert the trigger and select VCI
Record. Select OK.
When the trigger shows steady green, select Close and begin the test drive.
Accelerate the vehicle in Manual Mode through gears 1-2-3-4-5-6-7-8. Hold each gear 3~4
seconds.
Press the trigger at the end of the test drive. The trigger will flash green for a few seconds
and then show steady green.
Remove the trigger.
To copy the data from the VCI to the tablet, go to the home screen and select Recorded
Data. Select the VIN and the GDS data file. Select Data Copy.
Select Copy to SD card, give the file a name and select Save. The VCI will copy the data to
the SD card.

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




5.

After the data has been recorded, you can review the data on the GDS Mobile.
 Open GDS. Select Recorded Data.
 Select the vehicle and the GSR file and select File Open.
 Select Graph. Move all PIDs in the Item List to the Selected Item List. Select OK.
 The recorded data will display. Select the arrow at the top right of the screen and press
the + on the Time scale to select 1.0 sec/Div.
 Select the arrow at the top left. The screen will show cursor A and B.
 View the Current Gear and select the shift to be measured. Select A and place the
cursor to the left of the related solenoid PID. Select B and place the cursor to the right of
the related solenoid PID. Read the elapsed time at the top of the screen.

TSB #: 20-AT-019H

Page 2 of 12

SUBJECT:

6.

AUTOMATIC TRANSMISSION HARSH AND/OR DELAYED SHIFTS

To send a GDS file to the Techline Repository using GDS Mobile:
 From the GDS home page, select Internet.
 Logon to hyundaidealer.com. Enter dealer code, user ID and password.
 Select the down arrow next to SERVICE.
 Select Tech Info.
 Select Technical Training, select Techline and enter your information.
 Select Choose File. At the bottom of the screen, select Documents.
 Select SD Card, Android, Data, gitauto.GDSM, files, mcidata and Record.
 Select your vehicle, VIN and recorded file. Confirm the GSR file is displayed.
 Select Submit.
NOTE: For additional information, see instructions on TSB 19-GI-006H or Technical Training,
Techline Procedures and GDS/Repository File Upload (with or without SD card).

TSB #: 20-AT-019H

Page 3 of 12

SUBJECT:

AUTOMATIC TRANSMISSION HARSH AND/OR DELAYED SHIFTS

P-R SHIFT DIAGNOSIS:
Open the GDS. From the main screen, select Flight Record.
 Select the data file on your PC and select the vehicle and A/T menu.
 Select Data Review and select the file. Select Open to view the file.
 Click the “+” or “-” buttons to choose 0.9 sec/Div or less.
 View the 37R/C solenoid graph and locate the shift.
 Move the cursor to the start of the shift and “Left click”.
 Move the cursor to the end of the shift and “Right click”.
 Read the 37R/C solenoid elapsed time at the top right of the screen. If the P-R shift requires
more than 2.8 seconds, refer to TSB 16-AT-001-2, “Reset and Relearn Adaptive Values”:
 If the shift is less than 0.5 seconds, exchange a PCM from another vehicle and retest.
 If the shift time is more than 2.8 seconds, compare to a similar model and year vehicle.
Replace the transmission if the shift time is longer than a comparison vehicle.

TSB #: 20-AT-019H

Page 4 of 12

SUBJECT:

AUTOMATIC TRANSMISSION HARSH AND/OR DELAYED SHIFTS

N-D SHIFT DIAGNOSIS:
Open the GDS. From the main screen, select Flight Record.
 Select the data file on your PC. Select the vehicle and A/T menu.
 Select Data Review and select the file. Select Open to view the file.
 Click the “+” or “-” buttons to choose 0.9 sec/Div or less.
 View the UD/C solenoid graph and locate the shift.
 Move the cursor to the start of the shift and “Left click”.
 Move the cursor to the end of the shift and “Right click”.
 Read the UD/C solenoid elapsed time at the top right of the screen. If the N-D shift requires
more than 2.8 seconds, refer to TSB 16-AT-001-2, “Reset and Relearn Adaptive Values”:
 If the shift is less than 0.5 seconds, exchange a PCM from another vehicle and retest.
 If the shift time is more than 2.8 seconds, compare to a similar model and year vehicle.
Replace the transmission if the shift time is longer than a comparison vehicle.

TSB #: 20-AT-019H

Page 5 of 12

SUBJECT:

AUTOMATIC TRANSMISSION HARSH AND/OR DELAYED SHIFTS

1-2 UPSHIFT DIAGNOSIS:
Open the GDS. From the main screen, select Flight Record.
 Select the data file on your PC. Select the vehicle and A/T menu.
 Select Data Review and select the file. Select Open to view the file.
 Click the “+” or “-” buttons to choose 0.9 sec/Div or less.
 View the 28/B solenoid graph and locate the shift.
 Move the cursor to the start of the shift and “Left click”.
 Move the cursor to the end of the shift and “Right click”.
 Read the 28/B solenoid elapsed time at the top right of the screen. If the 1-2 shift requires
more than 2.8 seconds, refer to TSB 16-AT-001-2, “Reset and Relearn Adaptive Values”:
 If the shift is less than 0.5 seconds, exchange a PCM from another vehicle and retest.
 If the shift time is more than 2.8 seconds, compare to a similar model and year vehicle.
Replace the transmission if the shift time is longer than a comparison vehicle.

TSB #: 20-AT-019H

Page 6 of 12

SUBJECT:

AUTOMATIC TRANSMISSION HARSH AND/OR DELAYED SHIFTS

2-3 UPSHIFT DIAGNOSIS:
Open the GDS. From the main screen, select Flight Record.
 Select the data file on your PC. Select the vehicle and A/T menu.
 Select Data Review and select the file. Select Open to view the file.
 Click the “+” or “-” buttons to choose 0.9 sec/Div or less.
 View the 37R/C solenoid graph and locate the shift.
 Move the cursor to the start of the shift and “Left click”.
 Move the cursor to the end of the shift and “Right click”.
 Read the 37R/C solenoid elapsed time at the top right of the screen. If the 2-3 shift requires
more than 2.8 seconds, refer to TSB 16-AT-001-2, “Reset and Relearn Adaptive Values”:
 If the shift is less than 0.5 seconds, exchange a PCM from another vehicle and retest.
 If the shift time is more than 2.8 seconds, compare to a similar model and year vehicle.
Replace the transmission if the shift time is longer than a comparison vehicle.

TSB #: 20-AT-019H

Page 7 of 12

SUBJECT:

AUTOMATIC TRANSMISSION HARSH AND/OR DELAYED SHIFTS

3-4 UPSHIFT DIAGNOSIS:
Open the GDS. From the main screen, select Flight Record.
 Select the data file on your PC. Select the vehicle and A/T menu.
 Select Data Review and select the file. Select Open to view the file.
 Click the “+” or “-” buttons to choose 0.9 sec/Div or less.
 View the 46/C solenoid graph and locate the shift.
 Move the cursor to the start of the shift and “Left click”.
 Move the cursor to the end of the shift and “Right click”.
 Read the 46/C solenoid elapsed time at the top right of the screen. If the 3-4 shift requires
more than 2.8 seconds, refer to TSB 16-AT-001-2, “Reset and Relearn Adaptive Values”:
 If the shift is less than 0.5 seconds, exchange a PCM from another vehicle and retest.
 If the shift time is more than 2.8 seconds, compare to a similar model and year vehicle.
Replace the transmission if the shift time is longer than a comparison vehicle.

TSB #: 20-AT-019H

Page 8 of 12

SUBJECT:

AUTOMATIC TRANSMISSION HARSH AND/OR DELAYED SHIFTS

4-5 UPSHIFT DIAGNOSIS:
Open the GDS. From the main screen, select Flight Record.
 Select the data file on your PC. Select the vehicle and A/T menu.
 Select Data Review and select the file. Select Open to view the file.
 Click the “+” or “-” buttons to choose 0.9 sec/Div or less.
 View the OD&LR solenoid graph and locate the shift.
 Move the cursor to the start of the shift and “Left click”.
 Move the cursor to the end of the shift and “Right click”.
 Read the OD&LR solenoid elapsed time at the top right of the screen. If the 4-5 shift
requires more than 2.8 seconds, refer to TSB 16-AT-001-2, “Reset and Relearn Adaptive
Values”:
 If the shift is less than 0.5 seconds, exchange a PCM from another vehicle and retest.
 If the shift time is more than 2.8 seconds, compare to a similar model and year vehicle.
Replace the transmission if the shift time is longer than a comparison vehicle.

TSB #: 20-AT-019H

Page 9 of 12

SUBJECT:

AUTOMATIC TRANSMISSION HARSH AND/OR DELAYED SHIFTS

5-6 UPSHIFT DIAGNOSIS:
Open the GDS. From the main screen, select Flight Record.
 Select the data file on your PC. Select the vehicle and A/T menu.
 Select Data Review and select the file. Select Open to view the file.
 Click the “+” or “-” buttons to choose 0.9 sec/Div or less.
 View the 46/C solenoid graph and locate the shift.
 Move the cursor to the start of the shift and “Left click”.
 Move the cursor to the end of the shift and “Right click”.
 Read the 46/C solenoid elapsed time at the top right of the screen. If the 5-6 shift requires
more than 2.8 seconds, refer to TSB 16-AT-001-2, “Reset and Relearn Adaptive Values”:
 If the shift is less than 0.5 seconds, exchange a PCM from another vehicle and retest.
 If the shift time is more than 2.8 seconds, compare to a similar model and year vehicle.
Replace the transmission if the shift time is longer than a comparison vehicle.

TSB #: 20-AT-019H

Page 10 of 12

SUBJECT:

AUTOMATIC TRANSMISSION HARSH AND/OR DELAYED SHIFTS

6-7 UPSHIFT DIAGNOSIS:
Open the GDS. From the main screen, select Flight Record.
 Select the data file on your PC. Select the vehicle and A/T menu.
 Select Data Review and select the file. Select Open to view the file.
 Click the “+” or “-” buttons to choose 0.9 sec/Div or less.
 View the 37R/C solenoid graph and locate the shift.
 Move the cursor to the start of the shift and “Left click”.
 Move the cursor to the end of the shift and “Right click”.
 Read the 37R/C solenoid elapsed time at the top right of the screen. If the 6-7 shift requires
more than 2.8 seconds, refer to TSB 16-AT-001-2, “Reset and Relearn Adaptive Values”:
 If the shift is less than 0.5 seconds, exchange a PCM from another vehicle and retest.
 If the shift time is more than 2.8 seconds, compare to a similar model and year vehicle.
Replace the transmission if the shift time is longer than a comparison vehicle.

TSB #: 20-AT-019H

Page 11 of 12

SUBJECT:

AUTOMATIC TRANSMISSION HARSH AND/OR DELAYED SHIFTS

7-8 UPSHIFT DIAGNOSIS:
Open the GDS. From the main screen, select Flight Record.
 Select the data file on your PC. Select the vehicle and A/T menu.
 Select Data Review and select the file. Select Open to view the file.
 Click the “+” or “-” buttons to choose 0.9 sec/Div or less.
 View the 28/B solenoid graph and locate the shift.
 Move the cursor to the start of the shift and “Left click”.
 Move the cursor to the end of the shift and “Right click”.
 Read the 28/B solenoid elapsed time at the top right of the screen. If the 7-8 shift requires
more than 2.8 seconds, refer to TSB 16-AT-001-2, “Reset and Relearn Adaptive Values”:
 If the shift is less than 0.5 seconds, exchange a PCM from another vehicle and retest.
 If the shift time is more than 2.8 seconds, compare to a similar model and year vehicle.
Replace the transmission if the shift time is longer than a comparison vehicle.

TSB #: 20-AT-019H

Page 12 of 12