GROUP

NUMBER

EV SYSTEM

22-EV-001H

DATE

Technical Service Bulletin

MODEL(S)
Kona Electric
(OS EV)

APRIL 2022

KONA EV MOTOR RUMBLE NOISE

SUBJECT:

Description: This bulletin outlines the necessary inspection and repair procedures for certain 20192020MY Kona EV (OS EV) vehicles, exhibiting abnormal rumbling noise from the electric traction
motor.
Applicable Vehicles: Certain 2019-2020MY Kona Electric (OS EV) vehicles produced until
1/19/2021.
Parts Required: (NOTE: Be sure to check producton date of the subject vehicle):
MODEL

PART NAME

Kona Electric
(OS EV)

MOTOR/ROLL MOUNT
BRACKET AND BOLT KIT-A
MOTOR/ROLL MOUNT
BRACKET AND BOLT KIT-B

PART NUMBER

NOTE

Vehicle produced
before 5/13/19
Vehicle produced
5/13/19 or later

36930-0E700FFF
36930-0E710FFF

Warranty Information:
MODEL

Kona
Electric
(OS EV)

CAUSAL
PART

OP
CODE

OP CODE

OPERATION

36930F00

KIT REPLACEMENT
(2 TEST DRIVES)

3.2
M/H

36930F01

KIT INSPECTION AND
REPLACEMENT +
MOTOR/REDUCTION GEAR
REINSTALLATION (3 TEST
DRIVES)

8.8
M/H

36930F02

KIT INSPECTION AND
REPLACEMENT + MOTOR
REPLACEMENT (3 TEST DRIVES)

36930F03

KIT INSPECTION AND
REPLACEMENT + REDUCTION
GEAR REPLACEMENT (3 TEST
DRIVES)

8.8
M/H

36930F04

KIT INSPECTION AND
REPLACEMENT +
MOTOR/REDUCTION GEAR
REPLACEMENT (3 TEST DRIVES)

8.8
M/H

4450018EA1

8.8
M/H

NATURE CAUSE
CODE
CODE

Q55

ZZ1

NOTE: Normal Warranty Applies.
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair

KONA EV MOTOR RUMBLE NOISE

SUBJECT:

Troubleshoot Flow Diagram:

Test drive
(Check rumble
noise)

Replace mounting bolts of
traction motor/reduction
gear and brackets
(2 types)

Test drive
(Check rumble
noise)

KIT replacement

OK
Vehicle out

Rumble Noise generation

Noise not
Isolated

Inspect
traction motor/
reduction gear

Remove traction
motor/reduction gear
From vehicle
Inspect traction motor/reduction
gear and assemble vertically

Replace traction motor
and reassemble
vertically

Test drive
(Check noise)

모터/감속기
Noise can be isolated to
a particular component

Replace traction motor
or reduction gear

OK

Test drive
(Check noise)

OK

Vehicle out

Replace traction motor or reduction gear

NOTICE
• Always attach noise records as claim evidence. Claims without noise records may not be
accepted.

NOTICE
• Refer to the shop manual for high voltage safety precautions.
• Disconnect the battery’s negative (-) terminal before servicing.
• Perform the high voltage cut-off work before servicing.

TSB #: 22-EV-001H

Page 2 of 31
SUBJECT:

KONA EV MOTOR RUMBLE NOISE

SUBJECT:

Service Procedure:
1.
Test drive the vehicle. Creep in “D” and slowly accelerate/decelerate within speeds of 25-50
MPH, inspect for rumble noise generation from the traction motor and may especially be
noticeable on deceleration.
2.

If rumble is generated, place the car on a lift and proceed to disconnect the high voltage
system.
!

WARNING

• Refer to the shop manual section for high voltage precautions:
Motor System > High Voltage Battery Handling Guide
• When working on the high voltage system, make sure that you are familiar and comply
with the “Safety Precautions, Cautions and Warnings.” If you do not comply with the
safety procedures, serious injury or death may occur.
3.

Disconnect the service interlock connector
(A).

NOTICE
Be sure to wait for at least 3
minutes before proceeding to the
next step.

A

4.

If service interlock connector is unable to be
disconnected, proceed to service procedure
steps 5-9. Otherwise, proceed with step 10.

5.

Turn OFF the ignition switch and disconnect
the negative (-) cable of the 12V battery.

TSB #: 22-EV-001H

Page 3 of 31
SUBJECT:

SUBJECT:

6.

KONA EV MOTOR RUMBLE NOISE

Remove the trunk luggage board cover (B).

B

7.

Remove the rear seat.
Refer the shop manual section for complete
service procedure:
Body (Interior and Exterior) > Rear Seat

8.

Remove the service plug service cover (C).

C

TSB #: 22-EV-001H

Page 4 of 31
SUBJECT:

SUBJECT:

9.

KONA EV MOTOR RUMBLE NOISE

Remove the service plug (D).

D

A. Roll Mount Replacement
10.

11.

Place the vehicle on a lift and remove the
under cover.
Refer the shop manual section for complete
service procedure:
Motor System > Motor Assembly >
Support the reduction gear assembly with a
jack.

TSB #: 22-EV-001H

Page 5 of 31
SUBJECT:

SUBJECT:

12.

KONA EV MOTOR RUMBLE NOISE

Replace the roll mount.
Tightening Torque:
Bolt E: 79.6 – 94.1 lb-ft (107.9 – 127.5 Nm)
Bolt F: 47.0 – 61.5 lb-ft (63.8 – 83.4 Nm)

F
E

B. Motor Mounting Support Bracket Replacment
1.

Support the motor with a jack.

2.

Remove the motor mounting support bracket,
outlined in the figure.
Tightening Torque:
Nut G: 57.9 – 72.4 lb-ft (78.5 – 98.1 Nm)
Nut H: 43.4 – 54.3 lb-ft (58.9 – 73.6 Nm)
Bolt I: 43.4 – 54.3 lb-ft (58.9 – 73.6 Nm)

G

I
H

TSB #: 22-EV-001H

Page 6 of 31
SUBJECT:

KONA EV MOTOR RUMBLE NOISE

SUBJECT:

3.

Remove the motor support bracket (J).

J

4.

Remove the mass (K) from the new motor
support bracket.

5.

Replace the motor support bracket with a
new one.

K

NOTICE
First, tighten the top side bolt that
is outlined in the figure. After
inserting the bracket into the lower
side, pretighten the bolt.
7.

Assemble the mass (K) to the motor mount’s
top side. Ensure the protrusion faces
towards the engine compartment.
K

TSB #: 22-EV-001H

Page 7 of 31
SUBJECT:

KONA EV MOTOR RUMBLE NOISE

SUBJECT:

C. Motor Mounting Bolt Replacement

1.

Remove the high voltage junction box (L)
following the repair procedures in the shop
manual.
Battery Control System > High Voltage
Distributing System > High Voltage
Junction Box

L

Be sure to comply with the specified (On
Board Charger) OBC and Electronic Power
Control Unit (EPCU) torque values for the
mounting bolts.
Tightening Torque:
Bolt (A): 2.9 – 4.3 lb-ft (3.9 – 5.9 Nm)
Bolt (B): 6.5 – 7.2 lb-ft (8.8 – 9.8 Nm)

NOTICE
Tighten the bolts at a right angle to
avoid striping the threads.
2.

Loosen the 8 mounting bolts of the traction
motor and reduction gear regardless of
order.

TSB #: 22-EV-001H

Page 8 of 31
SUBJECT:

SUBJECT:

3.

KONA EV MOTOR RUMBLE NOISE

The tightening order of the traction motor and
reduction gear mounting bolts is shown in the
figure to the right.

7
2

8

4