GROUP
STEERING

Technical Service Bulletin
SUBJECT:

DATE
AUGUST, 2020

NUMBER
20-ST-002H-1
MODEL(S)
ELANTRA (ADa)

C-MDPS WORM SHAFT ASSEMBLY BEARING NOISE

THIS TSB SUPERSEDES 20-ST-002H TO REPLACE THE WORM SHAFT ASSEMBLY INSTEAD
OF THE COLUMN & HOUSING ASSEMBLY FOR C-MDPS BEARING NOISE.
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 assembly.

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 MY Elantra (ADa, VIN beginning with “5NP”) with production dates
between January 01, 2017 and February 28, 2018 or between November 07, 2019 and May 03,
2020, please refer to TSB 20-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 ASSEMBLY BEARING NOISE

Parts Information:
MODEL

PART NUMBER

PART DESCRIPTION

56351-G3AAA FFF

WORM SHAFT ASSY

56415-2H000*

LOWER STEERING
U-JOINT BOLT

PHOTO

ELANTRA (ADa)

NOTE: *Steering U-Joint Bolt cannot be reused during reassembly. Only one bolt is necessary for
this repair.
SST Information: Worm Shaft Assembly Plug Tool
MODEL

DESCRIPTION

PART NUMBER

ELANTRA (ADa)

C-SEG 2
(A: 42mm)

0K563-Q2100FFF

PICTURE

NOTE: To re-order the SST, contact Bosch at 1-866-539-4248.

TSB #: 20-ST-002H-1

Page 2 of 11
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C-MDPS WORM SHAFT ASSEMBLY BEARING NOISE

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Warranty Information:
MODEL

OP CODE

OPERATION

OP TIME

CAUSAL PART

NATURE
CODE

CAUSE
CODE

ELANTRA
(ADa)

00DA05R1

MDPS Worm Shaft
Assembly
Replacement

1.2 M/H

56390-F2820

Q57

ZZ7

NOTE 1: Submit Claim on Campaign Claim Entry Screen.
NOTE 2: If a part is found 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.



2.

MDPS Motor

To hear an example of the bearing
noise, refer to the link below.
https://youtu.be/ZCxFSskN-Rg

Replace the worm shaft assembly 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-1 (or current TSB related to partial
C-MDPS Repairs) for additional information.

TSB #: 20-ST-002H-1

A

Page 3 of 11
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C-MDPS WORM SHAFT ASSEMBLY BEARING NOISE

NOTICE
If the pinch bolts on either end of the
steering universal joint assembly are
removed, the bolts cannot be reused
during reassembly.

3.

Remove the C-MPDS assembly and
universal joint according to the applicable
vehicle shop manual.
*Steering System > Motor Driven Power
Steering > MDPS Assembly > Repair
Procedures

NOTICE
Before removing the C-MDPS assembly,
ensure the wheels are straight and the
steering wheel is level.

4.

Only remove the lower pinch bolt (A) on the
steering universal joint assembly to remove
the C-MDPS assembly.
Pinch Bolt Torque

lb-ft • 23.9-27.5
kgf.m • 3.3-3.8

A

N.m • 32.4-37.3

NOTICE
If the pinch bolts on either end of the
steering universal joint assembly are
removed, the bolts cannot be reused
during reassembly.

TSB #: 20-ST-002H-1

Page 4 of 11
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5.

C-MDPS WORM SHAFT ASSEMBLY BEARING NOISE

Loosen the motor mounting bolts (B).
Motor Mount Tightening Torque

lb-ft • 5.8-8.7

kgf.m • 0.8-1.2

B

N.m • 7.8-11.8

NOTICE
Wear clean gloves and perform the
procedure on a clean work bench to
prevent contamination of internal
components.

6.

Remove the motor assembly (C).

C

NOTICE
Reuse the flexible coupling.

7.

Remove the worm shaft plug (D) using the
worm shaft assembly plug tool.
Worm Shaft Plug Tightening Torque

lb-ft • 51.4-59.3
kgf.m • 7.1-8.2
D

N.m • 69.7-80.4

TSB #: 20-ST-002H-1

Page 5 of 11
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8.

C-MDPS WORM SHAFT ASSEMBLY BEARING NOISE

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

lb-ft • 7.2-9.4
F

kgf.m • 1.0-1.3
N.m • 9.8-12.8

9.

Remove the anti-rattle spring (G).

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

10.

G

Remove the slide pin (H).

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

TSB #: 20-ST-002H-1

H

Page 6 of 11
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11.

C-MDPS WORM SHAFT ASSEMBLY BEARING NOISE

There are a few methods to remove the
worm shaft assembly.
a. Use locking pliers or similar tool to
grip the coupler and pull out the
assembly.
After the worm shaft assembly is
freed, move to step 12. (Page 10)

OR

b. Place two flat-head screwdrivers
under the coupler, 180 degrees apart,
to pry out the assembly.
After the worm shaft assembly is
freed, move to step 12. (Page 10)

OR

c. If either of the above methods are
unsuccessful, move to step 11c (Page
8) for an alternate method of removal.

TSB #: 20-ST-002H-1

Page 7 of 11
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C-MDPS WORM SHAFT ASSEMBLY BEARING NOISE

11c. Alternate Method to Remove Worm Shaft Assembly
11c-1.

Remove the ECU mounting bolts (I) and set
aside the ECU assembly.
ECU Mounting Bolts Tightening Torque
I

lb-ft • 14.5-17.4
kgf.m • 2.0-2.4
N.m • 19.6-23.5
11c-2.

Remove the plug (J).
Plug Tightening Torque

lb-ft • 28.2-35.5
kgf.m • 3.9-4.9

J

N.m • 38.3-48.1

J

TSB #: 20-ST-002H-1

Page 8 of 11
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11c-3.

C-MDPS WORM SHAFT ASSEMBLY BEARING NOISE

Remove the grease plug (K).

NOTICE
Keep the grease plug free of debris after
removal. Reuse the plug during
reassembly.

K

During reassembly, align the hole on the
side of the grease plug with the boss to
insert the slide pin.

11c-4.

Place a short 3/8-inch socket extension or
similar tool (L) onto the small bearing (M) as
shown.

L
M

11c-5.

Using a plastic hammer or rubber mallet,
lightly tap the extension to free the worm
shaft assembly.
After the worm shaft assembly is freed,
move to step 12. (Page 10)

TSB #: 20-ST-002H-1

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12.

C-MDPS WORM SHAFT ASSEMBLY BEARING NOISE

Pull the worm shaft assembly out of the
MDPS column and discard the assembly.

NOTICE
Keep the housing opening free and clear
of debris.

13.

14.

Apply the entire contents of the supplied
grease evenly onto the new worm gear (N).

N

Carefully reinstall the new worm shaft
assembly.
Slide the assembly straight into the housing.
Light thumb pressure on either side of the
large bearing/coupler should be sufficient to
seat the assembly. If the assembly does not
slide into place, remove the assembly and
try again.

NOTICE
Do not force or tap the worm shaft
assembly into the housing.

TSB #: 20-ST-002H-1

Page 10 of 11
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15.

C-MDPS WORM SHAFT ASSEMBLY BEARING NOISE

Reinstall the removed parts in reverse order
of removal.

NOTICE
Ensure the steering wheel is level during
reinstallation.

16.

Connect the GDS and perform the ASP
calibration and EPS type recognition
according to the applicable vehicle shop
manual.

TSB #: 20-ST-002H-1

Page 11 of 11
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