NHTSA ID Number: 11027589
Manufacturer Communication Number: 26-FL-001H TSB
TSB/Document Date: 2026-01-13
Summary
Some vehicles equipped with a 2.5L GDI Theta III engine (non-Turbo) may exhibit one or more misfire DTCs due to the GDI fuel injectors leaking internally. This may be caused by internal filter breakage in the injector. Follow the procedure in this TSB to replace all 4 injectors on affected vehicles, using the kit in the Parts Information section.
GROUP
NUMBER
FUEL SYSTEM
Technical Service Bulletin
SUBJECT:
DATE
26-FL-001H
MODEL(S)
JANUARY 2026
SEE BELOW
GDI FUEL INJECTOR REPLACEMENT - MISFIRE DTC(S)
This TSB supersedes 25-FL-001H to update the Op times from 1.3 to 1.4 M/H in the Warranty
Information section on page 3.
IMPORTANT
This field action requires justification in the form of a customer concern, and a confirmed case for
the related symptom outlined in the TSB, prior to any repair work. If justification requirements are
not met, any submitted claims are subject to debit. New Vehicle Limited Warranty applies.
See Warranty Information section for more details.
Description: Some vehicles equipped with a 2.5L GDI Theta III engine (non-Turbo) may exhibit one or
more misfire DTCs due to the GDI fuel injectors leaking internally. This may be caused by internal filter
breakage in the injector. Follow the procedure in this TSB to replace all 4 injectors on affected vehicles,
using the kit in the Parts Information section.
Possible misfire DTCs: P0300, P0301, P0302, P0303, P0304
Applicable Vehicles:
Model Year
Model
2022
Engine
Production Dates
VIN Starts with
Santa Cruz (NXT)
05/26/2021 – 06/23/2022
5NT
2021 - 2022
Santa Fe (TMA)
03/01/2021 – 07/15/2022
5NM
2021 - 2023
Sonata (DN8)
02/08/2021 – 01/19/2023
KMH
2021 - 2022
Sonata (DN8A)
03/01/2021 – 02/14/2022
5NP
2022 - 2023
Tucson (NX4)
01/23/2021 – 11/05/2022
KM8
2022
Tucson (NX4A)
03/01/2021 – 07/11/2022
5NM
2.5L GDI
Theta III
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair
SUBJECT:
GDI FUEL INJECTOR REPLACEMENT - MISFIRE DTC(S)
Parts Information:
Part Name
Part Number
Kit
(contents below)
35399-2S133QQH
1
35310-2S000
2
1. Fuel Injector – GDI
Figure
Remarks
Use 1 Kit
per vehicle
Qty: 4
3
2. Clip – Fuel Injector
35309-04AA0
Qty: 4
3. Pipe – High Pressure
35305-2S000
Qty: 1
4. Gasket - Port
28411-2S010
5. Gasket – Port FKM
28411-2S020
6. Gasket – Throttle Body
28411-2S000
7. Gasket – EGR Pipe
28493-2S000
8. Gasket – Oil Filter Housing
4
Qty: 3
5
8
Qty: 1
Qty: 1
7
Qty: 1
6
26333-2S000
Qty: 2
SST Information:
Tool Name
Tool #
09314-L1100
Figure
Remarks
Use for High Pressure
Fuel Pipe Removal
TSB #: 26-FL-001H
Page 2 of 9
SUBJECT:
GDI FUEL INJECTOR REPLACEMENT - MISFIRE DTC(S)
SUBJECT:
Warranty Information:
HMMA models (VINs start with 5NP, 5NM, or 5NT)
Model
Santa Cruz (NXT)
Santa Fe (TMA)
Sonata (DN8A)
Tucson (NX4A)
Op. Code
Operation
Op.
Time
Causal Part
Nature
Code
Cause
Code
20DA14R9
GDI Fuel Injector
Replacement
(All 4 Injectors)
1.4
M/H
35310-2S000
W17
ZZ5
HMC models (VINs start with KMH or KM8)
Model
Op. Code
Operation
Op.
Time
Causal Part
Nature
Code
Cause
Code
Sonata (DN8)
Tucson (NX4)
20DA14RA
GDI Fuel Injector
Replacement
(All 4 Injectors)
1.4
M/H
35310-2S000
W17
ZZ5
NOTE 1: Submit claim on Claim Entry Screen as “Campaign” type.
NOTE 2: If a part is found in need of replacement while performing 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.
NOTE 3: This TSB includes a repair validation photo(s). Op times include VIN, mileage, and repair
validation photo(s) as outlined in the Digital Documentation Policy.
NOTE 4: The incident parts are subject to callback through the normal Warranty Technical Center
(WTC) parts return process. Claim is subject to debit if the part is not returned.
TSB #: 26-FL-001H
Page 3 of 9
SUBJECT:
SUBJECT:
GDI FUEL INJECTOR REPLACEMENT - MISFIRE DTC(S)
Service Procedure:
DIGITAL DOCUMENTATION
This TSB includes repair justification photos. Refer to the latest Warranty Digital Documentation
Policy for requirements.
NOTICE
Applying the recommended torque to all fasteners is essential to reduce potential issues from
occurring after the service procedure.
Flowchart:
Vehicle In
- 6X better wear protection on critical engine parts than...
- 1.3X better sludge protection than industry standards*
- 3X Stronger against viscosity breakdown than leading full...
- Protection for 10,000 miles between oil changes
- Meets or exceeds the following specifications: API SP/SN...
- Formulated for engines with 75,000 miles or more, Valvoline...
- Delivers 20% better wear protection and 15% better sludge...
- Extra detergents safeguard against friction, corrosion and...
- Advanced friction-fighting additives help maximize...
- Provides performance benefits for high mileage, new and...
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TSB/Document ID: 26-FL-001H TSB
Replacement Service Bulletin Number:
MFR Communication Date: 2026-01-07
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: FUEL/PROPULSION SYSTEM
MFR Component System:
MFR Component Subsystem:
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