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.
Front Motor-Gear Drive Unit Assembly
Figure
Qty.
Comments
44000 18FA0
1
70 kW
Bolt – Steering Universal Joint Assembly
56415 L1000
1
Lock Nut – Tie Rod End
55259 2M000
2
Split Pin – Tie Rod End
57799 4D200
4
N/A
Lock Nut – Front Drive Shaft
49551 4T000
2
Circlip – Drive Shaft
49557 F2000
2
Gasket – Inverter
366G9 1XAA0
1
Coolant (Gal.)
UM020 CH263
2 Gal.
Tie Rod 2 ea. &
Lower WR Arm 2 ea.
6.9 L
*Note: The EV6 Front Motor Gear Drive Unit is pre-filled with gear oil PN UM022 CH269.
(Max. Fill Capacity is 3.0 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) October 2025
Kia
America, Inc. Internal
Use Only
Page 6 of 7
FRONT MOTOR REDUCTION GEAR ASSEMBLY REPLACEMENT (SC345Z)
SUBJECT:
WARRANTY INFORMATION: NIRO EV (SG2 EV)
N Code: N99 C Code: C99
Model
Claim
Causal
Type
P/N
Qty.
Repair
Labor Op
Op
Replacement
Description
Code
Time
P/N
(SC345Z)
SG2
R
EV
36501
0EDA0
0
Front Reduction
Gear Assembly
250060R7
5.3
M/H
Replacement
Qty.
36501 0EDA0
1
55259 2M000
2
57799 4D200
2
54566 3M500
2
49551 3X000
2
49557 F2000
2
56415 L1000
1
21920 A7000
1
55117 AA100
4
54559 1F000
2
366G1 0EJA0
1
366G2 0EJA0
1
366G9 0EJA0
1
UM020 CH263
5
Refer to Warranty Bulletin 2025-24 for claim submission procedures. When substitute transportation is
provided, manually enter sublet code ‘X2’ for rental expense reimbursement or one roundtrip rideshare
expense.
NOTICE
VIN inquiry data for this repair is provided for tracking purposes only. Kia retailers should reference
SC345Z when accessing the KDealer+ system.
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 7 of 7
FRONT MOTOR REDUCTION GEAR ASSEMBLY REPLACEMENT (SC345Z)
SUBJECT:
WARRANTY INFORMATION: EV6 (CV)
N Code: N99 C Code: C99
Model
Claim
Causal
Type
P/N
Qty.
Repair
Labor Op
Op
Replacement
Description
Code
Time
P/N
(SC345Z)
EV6
R
44000
18FB0
0
Front Reduction
Gear Assembly
Replacement
250060R6
5.4
M/H
Qty.
44000 18FA0
1
56415 L1000
1
55259 2M000
2
57799 4D200
4
49551 4T000
2
49557 F2000
2
366G9 1XAA0
1
UM020 CH263
2
Refer to Warranty Bulletin 2025-24 for claim submission procedures. When substitute transportation is
provided, manually enter sublet code ‘X2’ for rental expense reimbursement or one roundtrip rideshare
expense.
NOTICE
VIN inquiry data for this repair is provided for tracking purposes only. Kia retailers should reference
SC345Z when accessing the KDealer+ system.
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
- 3X Stronger than the leading full synthetic*
- 10X Better high stress performance**
- 20,000 miles between oil changes***
- Viscosity breakdown as measured in Kurt Orbahn test on 5W...
- As measured in Seq IX test under high load/torque conditions...
- Phosphorus Replacement Technology to help extend the life of...
- Reduces leaks, oil burnoff and power robbing deposits
- 15,000 miles between oil changes*
- Meets or exceeds the following specifications: API SP/SN...
- Or one year, whichever comes first
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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 |
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