NHTSA ID Number: 11029043
Manufacturer Communication Number: SC325_TSB_R1
TSB/Document Date: 2026-02-26
Summary
TECHNICAL SERVICE BULLETIN: VOLUNTARY EMISSIONS SERVICE CAMPAIGN: AEWP INSPECTION AND REPLACEMENT (SC325) - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides information to inspect and, if necessary, replace the Auxiliary Electric Water Pump (AEWP), control harness wiring, and/or engine room junction box for coolant intrusion and/or corrosion on certain 2022-2023MY Kia
Hybrid and Plug-in Hybrid vehicles listed in the table below. The AEWP in the subject vehicles may crack internally and allow coolant to intrude into the AEWP circuitry. If coolant enters the AEWP circuitry, the Check Engine Light (CEL) may be illuminated with one or more DTCs listed on page 2. If the vehicle continues to be driven in this condition, the Active Air Flap (AAF) warning message can also activate, and coolant may eventually migrate through the wiring harness to the engine room junction block. This may result in a reduction of motive power and may cause the vehicle to release air pollutants which exceeds Federal and California standards. These standards were established to protect the public health and welfare from the dangers of air pollution.
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TSB/Document ID: SC325_TSB_R1
Replacement Service Bulletin Number:
MFR Communication Date: 2026-02-20
MFR Internal Campaign ID/Software Version: SC325
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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GROUP
MODEL
Voluntary Emissions
2022-2023MY
Service Campaign
Multiple Models
Listed (HEV, PHEV)
NUMBER
DATE
SC325 (Rev 1, 02/19/2025)
February 2025
VOLUNTARY EMISSIONS SERVICE CAMPAIGN
AEWP INSPECTION AND REPLACEMENT (SC325)
NOTICE
This bulletin has been revised to include additional information. New/revised sections of this
SUBJECT:
bulletin are indicated by a black bar in the margin area.
This bulletin provides information to inspect and, if necessary, replace the Auxiliary Electric Water Pump (AEWP),
control harness wiring, and/or engine room junction box for coolant intrusion and/or corrosion on certain 20222023MY Kia Hybrid and Plug-in Hybrid vehicles listed in the table below. The AEWP in the subject vehicles may
crack internally and allow coolant to intrude into the AEWP circuitry. If coolant enters the AEWP circuitry, the
Check Engine Light (CEL) may be illuminated with one or more DTCs listed on page 2. If the vehicle continues
to be driven in this condition, the Active Air Flap (AAF) warning message can also activate, and coolant may
eventually migrate through the wiring harness to the engine room junction block. This may result in a reduction
of motive power and may cause the vehicle to release air pollutants which exceeds Federal and California
standards. These standards were established to protect the public health and welfare from the dangers of air
pollution. Follow the procedure outlined in this publication to inspect for a related DTC(s) stored and coolant
leaking into the AEWP harness wiring connector on the applicable vehicle. Depending on the inspection result,
replacement of the AEWP may be required, along with possible Control Harness wiring and PCB block assembly.
Before conducting the procedure, verify that the vehicle is included in the list of affected VINs.
MY
Model
Production Date Range
2022-2023
Sorento HEV, PHEV (MQ4 P/HEV) Gamma II 1.6L T-GDI
March 02, 2022 – December 27, 2022
2023
Sportage HEV, PHEV (NQ5 P/HEV) Gamma II 1.6L T-GDI
March 02, 2022 – January 04, 2023
2023
Niro HEV, PHEV (SG2 P/HEV) Kappa 1.6L GDI
June 21, 2022 – April 26, 2023
NOTICE
There is no charge to the vehicle owner for this repair.
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.
This issue number is SC325.
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.
Page 2 of 13
AEWP INSPECTION AND REPLACEMENT (SC325)
SUBJECT:
Flowchart:
Related DTC Description(s):
•
P260100 – Coolant Pump Control Circuit Range/Performance
•
P2B9C00 - Coolant Pump 'A' Stuck/Stalled
•
U019F00 - Lost Communication with Engine Coolant Pump Control Module
•
U062300 - Lost Communication with Coolant Pump 'A'
•
U111200 - LIN Communication Error
Vehicle IN
NO
(OK)
Are Related
DTCs Stored?
YES
(NG)
Control
Harness
Inspection
(AEWP Side)
OK
AEWP
Replacement
(pg. 5)
OK
Control Harness +
AEWP
Replacement
(pg. 5 & 6)
NG
Control
Harness
Inspection
(PC Block Side)
NG
Control Harness +
AEWP Replacement+
PCB Block Replacement
(pg. 5 & 6)
Vehicle OUT
One (1) of the MQ4 HEV Control Harness Part Numbers is
currently unavailable. If an MQ4 HEV vehicle requires the
replacement of the unavailable control harness part number, the
vehicle will need to be parked until the replacement part number
is available.
Note: A Vehicle Diagnosis Number (VDN) must be created for DTC’s prior to ordering parts and
performing necessary procedure(s), as outlined in this TSB. If a VDN is not created, Parts Ordering and
Warranty claim submission issues WILL occur. Any claims for replacement parts are subject to Warranty
review and chargeback.
Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.
TSB: SC325 (Rev 1) Multiple Models February 2025
Kia America, Inc.
Page 3 of 13
AEWP INSPECTION AND REPLACEMENT (SC325)
SUBJECT:
Inspection Procedure:
1.
2.
Using KDS, scan the vehicle for related DTC(s):
•
U019F00 – Lost Communication with Engine Coolant Pump Control Module
•
U062300 – Lost Communication with Coolant Pump ‘A’
•
P260100 – Coolant Pump ‘A’ Control Circuit Performance/Stuck Off
•
P2B9C00 – Coolant Pump ‘A’ Stuck/Stalled
•
U111200 – LIN Communication Error
Are any related DTC(s) stored?
•
No, related DTC(s) are NOT stored (OK),
no further action is required. Claim Op
Code 240222I0 to close this campaign.
•
Yes, related DTC(s) ARE stored (NG),
proceed to step 3.
3.
Disconnect the 12V battery negative (-)
terminal (A).
4.
Remove the engine room under cover (B).
Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.
TSB: SC325 (Rev 1) Multiple Models February 2025
Kia America, Inc.
Page 4 of 13
AEWP INSPECTION AND REPLACEMENT (SC325)
SUBJECT:
5.
Locate AEWP and disconnect the control
harness connector (C).
6.
Inspect the AEWP connector (C) for moisture
and/or coolant residue.
Are moisture and/or coolant residue present in
the connector?
•
NO, moisture and coolant residue were
NOT found (OK), then replace the
following parts to close this campaign:
1)
•
AEWP assembly (Page 5)
YES, moisture and/or coolant residue
WERE found (NG), then proceed to step 7.
7.
Lower the vehicle and locate the Process
Control Block (PCB) – Fuse/Junction box (D).
8.
Disconnect the control harness connectors (E)
and inspect the connector for moisture.
Is coolant residue present in the connector?
•
NO, moisture and coolant residue were
NOT found (OK), then replace the
following parts to close this campaign:
1)
AEWP assembly (Page 5)
2) Control Harness wiring (Page 6)
•
YES, moisture and/or coolant residue
WERE found (NG), take a picture of the
inspection
area
using
KDS
warranty
attachment picture function to secure
proper
documentation
and
warranty
compliance, then replace the following
parts to close this campaign:
1)
AEWP assembly (Page 5)
2) Control Harness wiring (Page 6)
3) Engine Room PCB Block (Page 5)
Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.
TSB: SC325 (Rev 1) Multiple Models February 2025
Kia America, Inc.
Page 5 of 13
AEWP INSPECTION AND REPLACEMENT (SC325)
SUBJECT:
Replacement Procedure: (Auxiliary EWP Assembly and Extension Wiring)
1.
Replace the AEWP (A) by referring to “Heating,
Ventilation and Air Conditioning → Heater →
Auxiliary Electric Water Pump (AEWP) →
Repair procedure/Removal and Installation” in
the applicable Shop Manual on KGIS.
Engine Room PCB Block Replacement:
1.
Replace the PCB Block (A) by referring to
“Body electrical System → Fuses and Relays →
Engine
Room
Junction
Box
→
Repair
procedure (Engine Room PCB Block)” in the
applicable Shop Manual on KGIS.
NQ5 HEV, MQ4 HEV
NQ5 PHEV, MQ4 PHEV
SG2 HEV, PHEV
Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.
TSB: SC325 (Rev 1) Multiple Models February 2025
Kia America, Inc.
Page 6 of 13
AEWP INSPECTION AND REPLACEMENT (SC325)
SUBJECT:
Control Harness (Engine Room) Wiring Replacement: (MQ4/NQ5 P/HEV)
IMPORTANT
One (1) of the MQ4 HEV Control Harness Part Numbers is currently unavailable. If an MQ4 HEV
vehicle requires the replacement of the unavailable control harness part number, the vehicle will
need to be parked until the replacement part number is available.
1.
Remove the following parts by referring to the
applicable shop manual on KGIS:
•
Air Cleaner Assembly (A)
•
Hybrid Power Control Unit (HPCU) (B)
Tightening torque for HPCU bolts:
14.5 – 21.7 lb.ft (19.6 – 29.4 N.m)
2.
Remove the control harness (C) (shown in
green) from the engine room by disconnecting
all related connectors and grounds from the
engine components.
3.
Disconnect the control harness (C) from the
junction block and remove the control harness
assembly.
4.
Install the new control harness (C) assembly in
the reverse order of removal.
Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.
TSB: SC325 (Rev 1) Multiple Models February 2025
Kia America, Inc.
Page 7 of 13
AEWP INSPECTION AND REPLACEMENT (SC325)
SUBJECT:
Control Harness (Engine Room) Wiring Replacement: (SG2 P/HEV)
1.
Remove the coolant reservoir cap (A).
2.
Drain the hybrid motor coolant by removing
the drain plug (B).
3.
Remove the following parts by referring to the
applicable shop manual on KGIS:
4.
•
Air Cleaner Assembly
•
Hybrid Power Control Unit (HPCU)
Remove the control harness (C) (shown in
green) from the engine room by disconnecting
all related connectors and grounds from the
engine components.
5.
Disconnect the control harness (C) from the
junction block and remove the control harness
assembly.
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