GROUP

NUMBER

STEERING

Technical Service Bulletin
SUBJECT:

DATE
OCTOBER 2021

21-ST-002H
MODEL(S)
Elantra (ADA)

C-MDPS WORM SHAFT BEARING NOISE

THIS TSB SUPERSEDES 20-ST-002H-2 TO REPLACE THE SMALL BEARING ONLY INSTEAD OF
THE WORM SHAFT ASSEMBLY AND TO EXPAND THE MODEL YEAR AND PRODUCTION DATE
OF THE RELATED TSB 21-ST-003H.
Description: Certain vehicles may develop a bearing noise within the Motor Driven Power Steering
(MDPS) column worm shaft assembly. If bearing noise is heard, follow the procedure in this bulletin to
replace the worm shaft bearing.

Applicable Vehicles:
Certain 2018 – 2020 MY Elantra (ADa, VIN beginning with “5NP”), with production dates between
March 01, 2018 and November 06, 2019.

NOTICE
Certain 2017 – 2018 or 2020 – 2021 MY Elantra (ADa, VIN beginning with “5NP”) with production
dates between January 01, 2017 and February 28, 2018 or between November 07, 2019 and
June 30, 2021, please refer to TSB 21-ST-003H, C-MPDS Worm Shaft Bearing Noise.

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

SUBJECT:

C-MDPS WORM SHAFT BEARING NOISE

Parts Information:
PART NAME

PART NUMBER

2

1

SMALL
BEARING KIT

PART
DESCRIPTION

PHOTO

1.
2.
3.
4.

56359-L1AAAFFF
3
4

End cover assy
Sliding damper
Bearing
Paper stick

NOTE: Discard part #1. Only the Sonata and Sonata Hybrid (DN8a and DN8 HEV) requires the use
of the end cover.
SST Information:
PART NAME

PART NUMBER

MDPS
SMALL BEARING
REMOVAL TOOL

0K563-L2100FFF

MDPS
SMALL BEARING
MOUNTING TOOL

0K563-L2200FFF

PHOTO

NOTE: All dealers were sent one of each tool at the launch of this TSB in October 2021.
TSB #: 21-ST-002H

Page 2 of 10
SUBJECT:

SUBJECT:

C-MDPS WORM SHAFT BEARING NOISE

Warranty Information:
OP CODE

OPERATION

OP TIME

CAUSAL PART

NATURE
CODE

CAUSE
CODE

ELANTRA
00DA05R2
(ADa)

Small Bearing
Replacement

0.6 M/H

56351-G3AAAFFF

Q57

ZZ6

MODEL

NOTE 1: Submit Claim on Campaign Claim Entry Screen.
NOTE 2: If a part is found that is not covered by this TSB in need of replacement while performing the
repair for 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.
Service Procedure:
1.
Determine if bearing noise comes from the
MDPS column and housing.
•

Start the engine and turn the steering
wheel left and right.

•

Listen for the bearing noise occurring
from the worm shaft housing (A). This
noise will be located near the CMDPS motor on the steering column.

•

MDPS Motor

To hear an example of the bearing
noise, refer to the link or QR code
below.
https://youtu.be/22PI3hAEfnk

A
2.

Replace the worm shaft small bearing if
noise is heard.
If noise is not heard in this location, refer to
the shop manual for detailed diagnostic and
repair service procedures or refer to TSB 20ST-001H-2, Column-Mounted MDPS Repair
Information (or current TSB related to partial
C-MDPS Repairs) for additional information.

TSB #: 21-ST-002H

Page 3 of 10
SUBJECT:

SUBJECT:

C-MDPS WORM SHAFT BEARING NOISE

3.

Ensure the wheels are straight and the
steering wheel is level.

4.

Record the customer’s AM, FM, and SXM
radio preset stations.

5.

Disconnect the negative (-) battery terminal.

NOTICE
Wait at least 3 minutes before
proceeding to ensure voltage is bled
off.
Battery Terminal Tightening Torque
Follow the applicable shop manual for
battery terminal tightening torque.

!

CAUTION

Not removing the negative (-) terminal
from the battery may result in
accidental airbag deployment and
possible physical injury.
6.

Removal of the MDPS assembly is not
required to replace the small bearing located
in the MDPS steering column and housing.
Several parts might need to be removed to
gain access to the small bearing.
If equipped, carefully remove the driver's
knee airbag following the procedures in the
applicable shop manual.
Restraint > Airbag Module > Knee Airbag
(KAB) Module

!

CAUTION

The airbag may accidently be deployed
and possibly cause physical injury.
After removing the knee airbag
module, position airbag with the cover
facing upward.

TSB #: 21-ST-002H

Page 4 of 10
SUBJECT:

SUBJECT:

C-MDPS WORM SHAFT BEARING NOISE

7.

After removing the KAB, additional parts
might have to be removed to gain access to
the small bearing. Follow the applicable
shop manual for part removal procedures.

8.

Remove the plug (B).
Reuse the plug during reassembly.
Plug Tightening Torque

lb-ft • 28.2-35.5

B

kgf.m • 3.9-4.9
N.m • 38.3-48.1

9.

Remove the anti-rattle plug (D).
Anti-Rattle Plug Tightening Torque

lb-in • 86.4-112.8
lb-ft • 7.2-9.4

D

kgr.m • 1.0-1.3
N.m • 9.8-12.8

10.

Remove the anti-rattle spring (E).

NOTICE
Keep the anti-rattle spring free of
debris after removal. Reuse the spring
during reassembly.

TSB #: 21-ST-002H

E

Page 5 of 10
SUBJECT:

SUBJECT:

11.

C-MDPS WORM SHAFT BEARING NOISE

Remove the slide pin (F).

NOTICE
Keep the slide pin free of debris after
removal. Reuse the slide pin during
reassembly.

12.

F

Remove the sliding damper (G) and discard.

G

TSB #: 21-ST-002H

Page 6 of 10
SUBJECT:

SUBJECT:

13.

C-MDPS WORM SHAFT BEARING NOISE

Use the MDPS small bearing removal tool,
to remove and discard the bearing.
How to use the tool
1. Insert the ends (a) of the tool into the
MDPS housing to grasp the outer
race of the bearing.
2. Slowly turn the threaded rod (b) until
the tip (c) reaches the center of the
bearing and worm shaft.
3. Continue to turn the rod slowly until
the bearing is pulled off the worm
shaft.

b

b

c

a

14.

Use the supplied paper stick to remove the
excess grease.

TSB #: 21-ST-002H

Page 7 of 10
SUBJECT:

SUBJECT:

15.

C-MDPS WORM SHAFT BEARING NOISE

Remove the bolt (H) from the MDPS small
bearing mounting tool. This bolt will be used
to locate the tool on the MDPS housing.

H

NOTICE
After completing the bearing
installation procedure, thread the bolt
back into its original position.

16.

Insert the new, small bearing into the
bearing holder.

17.

Place the tool onto the MDPS housing as
shown in the photo in the right. Slide the bolt
(H) through the hole and then thread the bolt
into the anti-rattle plug boss (I). Tighten the
bolt (H) until the tool is firmly held onto the
MDPS housing.

TSB #: 21-ST-002H

H

I

Page 8 of 10
SUBJECT:

SUBJECT:

18.

C-MDPS WORM SHAFT BEARING NOISE

Use a torque wrench to slowly seat the
bearing into position on the worm shaft.
Bearing Seating Torque

lb-in • 26.52
lb-ft • 2.21
kgf.m • 0.31
N.m • 3.0

NOTICE
Note the small torque values to seat
the bearing.
Only use hand tools. Electric tools may
damage the bearing during assembly.
19.

Remove the tool from the MDPS housing
and inspect the bearing.
Ensure the bearing is fully seated and the
end of the worm shaft is protruding
approximately 1.2mm (0.047 inch).
If the bearing did not seat as shown in the
photo, increase the torque setting on the
torque wrench and continue to slowly seat
the bearing.
Increased Bearing Seating Torque

lb-in • 44.28

OK
Bearing is seated
properly. The end
of the worm shaft is
protruding.

Not OK
Bearing is not
seated properly.
The end of the
worm shaft is flush
with the bearing.

lb-ft • 3.69
kgf.m • 0.51
N.m • 5.0

NOTICE
If the bearing is removed during this
procedure, do not reinstall the bearing
as it might be damaged and cause a
noise. A new bearing must be used.

TSB #: 21-ST-002H

Page 9 of 10
SUBJECT:

SUBJECT:

20.

C-MDPS WORM SHAFT BEARING NOISE

Install the new sliding damper. Align the hole
on the side of the sliding damper (J) with the
anti-rattle plug boss (I).
I

Align this side with
the hole with the
plug boss.
21.

Reinstall parts in the reverse order of
removal.

22.

Reconnect the negative battery cable after
all the components have been reinstalled to
the vehicle.

23.

If necessary, program the customer’s AM,
FM, and SXM radio preset stations.

24.

The service procedure is now complete.

TSB #: 21-ST-002H

J

Not this side.

Page 10 of 10
SUBJECT: