NHTSA ID Number: 11024346
Manufacturer Communication Number: SC345Z_TSB
TSB/Document Date: 2025-10-17
Summary
TECHNICAL SERVICE BULLETIN: SUBSEQUENT REPAIR ACTION: FRONT MOTOR REDUCTION GEAR ASSEMBLY REPLACEMENT (SC345Z) - This bulletin provides information regarding grinding or whining noise coming from the front motor reduction gear assembly after replacing the oil under SC345 (published in August 2025) on certain 2023-2024MY Niro EV (SG2 EV) vehicles produced from December 12, 2022 through February 7, 2024 and EV6 (CV) vehicles produced from December 14, 2022 through February 22, 2024. In rare cases, the front motor reduction gear assembly may exhibit noise after having the oil replaced.
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TSB/Document ID: SC345Z_TSB
Replacement Service Bulletin Number:
MFR Communication Date: 2025-10-09
MFR Internal Campaign ID/Software Version: SC345Z
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
MFR Component System: Subsequent Repair Action
MFR Component Subsystem:
Previous TSB | Next TSB |
GROUP
MODEL
Subsequent Repair
2023-2024MY
Action
NUMBER
DATE
SC345Z
October 2025
SUBSEQUENT REPAIR ACTION
SUBJECT:
FRONT MOTOR REDUCTION GEAR ASSEMBLY
REPLACEMENT (SC345Z)
This bulletin provides information regarding grinding or whining noise coming from the front motor reduction
gear assembly after replacing the oil under SC345 (published in August 2025) on certain 2023-2024MY Niro
EV (SG2 EV) vehicles produced from December 12, 2022 through February 7, 2024 and EV6 (CV) vehicles
produced from December 14, 2022 through February 22, 2024. In rare cases, the front motor reduction gear
assembly may exhibit noise after having the oil replaced. Follow the procedure outlined in this publication to
replace front motor reduction gear assembly with a new part on the applicable vehicle. Before conducting the
procedure, verify that the vehicle is included in the list of affected VINs.
NOTICE
Repair status for a VIN is provided on KDealer+ (Service → Warranty Coverage → Warranty
Coverage Inquiry → Campaign Information). Not completed Recall / Service Action reports are
available on KDealer+ (Consumer Affairs → Not Completed Recall → Recall VIN → Select Report),
which includes a list of affected vehicles.
A printed copy is for reference only; publication information can be updated at any time.
Always refer to KGIS for the latest information. After logging in kdealer.com, the newest technical
publications are listed in ‘Service Releases’ and has the latest service information that has been released.
Kia
America, Inc. Internal Use Only
Page 2 of 7
SUBJECT:
FRONT MOTOR REDUCTION GEAR ASSEMBLY REPLACEMENT (SC345Z)
Flowchart:
Before Proceeding: The affected vehicle has previously completed campaign SC345 Front Reduction
Gear Unit Oil Replacement and is now confirmed to have whining or grinding noise coming from the
Front Motor Reduction Gear Unit.
Vehicle In
Front Motor Reduction Gear Unit Noise
after SC345 was completed.
YES
Source of grinding or whining noise verified
by the technician to come from the
Front Motor Reduction Gear Unit?
NO
YES
REQUEST PWA APPROVAL
•
•
Attach Video
Open Techline PWA
NO
Other noise, not related to
SC345. TSB is not applicable.
YES
Replace the
Front Motor Reduction Gear Unit Assy
Page 3.
Vehicle Out
Printed document copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.
TSB: SC345Z Niro EV (SG2 EV), EV6 (CV)Kia
October
America,2025
Inc. Internal Use Only
Page 3 of 7
SUBJECT:
FRONT MOTOR REDUCTION GEAR ASSEMBLY REPLACEMENT (SC345Z)
Repair Procedure:
DANGER
When performing this procedure, follow all EV battery safety precaution procedures found in the
“General Information → General Safety Information and Caution” chapter in the Shop Manual on
KGIS and wear all required Personal Protection Equipment (PPE). Failure to follow the safety
instructions may result in serious electrical injuries.
1.
Replace the front motor gear drive unit by
referring to “Motor and Reduction Gear
System → Front Motor and Reduction Gear
Assembly → Removal/Installation” in the
applicable Shop Manual on KGIS.
IMPORTANT
Follow the instructions on KGIS and
refer to the Warning, Caution, and
Notice boxes. Replace the applicable
non-reusable parts included in this
bulletin.
2.
Verify
normal
vehicle
operation
SG2 EV Front Motor Gear Drive Assy show for reference only.
*Note: The new Front Motor Gear Drive Unit is
pre-filled with gear oil PN UM022 CH269.
after
replacement is completed.
Printed document copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.
TSB: SC345Z
Niro EV (SG2 EV), EV6 (CV) October 2025
Kia America, Inc. Internal
Use Only
Page 4 of 7
SUBJECT:
FRONT MOTOR REDUCTION GEAR ASSEMBLY REPLACEMENT (SC345Z)
AFFECTED VEHICLE RANGE:
Model
Production Date Range
December 12, 2022 to February 7, 2024
EV6 (CV)
December 14, 2022 to February 22, 2024
REQUIRED TOOL:
Tool Name
Part Number
Engine Fixture (Adapter)
09200 4X000
Figure
Comments
Shop
REQUIRED PART: NIRO EV (SG2 EV)
Part Name
Part Number
Front Motor Gear Drive Unit
Figure
Qty.
Comments
36501 0EDA0
1
Pre-filled with oil*
Lock Nut – Tie Rod End
55259 2M000
2
Split Pin – Tie Rod End
57799 4D200
2
Split Pin – Ball Joint
54566 3M500
2
Lock Nut – Driveshaft
49551 3X000
2
Clip - Driveshaft Clip
49557 F2000
2
Drive & Inner Shaft
56415 L1000
1
Lower Arm
N/A
Bolt – Roll Rod Bracket
21920 A7000
1
Bolt – Front Lower Arm
55117 AA100
4
Nut – Front Lower Arm
54559 1F000
2
Gasket – Inverter
366G1 0EJA0
1
Service Output
Gasket – Inverter
366G2 0EJA0
1
Service Input
Gasket – Inverter Assembly
366G9 0EJA0
1
Coolant (Gal.)
UM020 CH263
5 Gal.
=14.5 L
*Note: The Niro EV Front Motor Gear Drive Unit is pre-filled with gear oil PN UM022 CH269.
(Max. Fill Capacity is 2.3 liters)
Printed document copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.
TSB: SC345Z Niro EV (SG2 EV), EV6 (CV)Kia
October
America,2025
Inc. Internal Use Only
Page 5 of 7
SUBJECT:
FRONT MOTOR REDUCTION GEAR ASSEMBLY REPLACEMENT (SC345Z)
REQUIRED PART: EV6 (CV)
Part Name
Part Number
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