2021-2023 Hyundai Misfire DTCs P0300-P0304 TSB
Hyundai Technical Service Bulletin 25-FL-001H details the replacement of GDI fuel injectors for 2021-2023 Santa Cruz, Santa Fe, Sonata, and Tucson models experiencing misfire diagnostic trouble codes P0300, P0301, P0302, P0303, P0304 due to internal leakage.
Ahmet Topcu2022 Hyundai Tucson
Si applica anche a
- Hyundai Santa Cruz
- 2022
- Hyundai Santa Fe
- 2021–2022
- Hyundai Sonata
- 2021–2023
- Hyundai Tucson
- 2023
Hyundai has issued Technical Service Bulletin (TSB) 25-FL-001H, dated January 2025, to address misfire diagnostic trouble codes (DTCs) that may appear in certain 2021-2023 models equipped with the 2.5L GDI Theta III non-turbo engine. This TSB supersedes the previous bulletin 23-FL-002H-1 and provides updated procedures for replacing all GDI fuel injectors, including revised parts information, warranty details, and service procedures.
The TSB explains that internal leakage within the GDI injectors, potentially caused by internal filter breakage, can lead to various misfire DTCs. If your vehicle exhibits a Hyundai Tucson misfire DTC P0300 or any other misfire code listed, this bulletin outlines the necessary repair.
Symptoms
Owners of affected Hyundai vehicles may notice their engine exhibiting one or more misfire diagnostic trouble codes. These codes indicate that one or more cylinders are not firing correctly, which can lead to rough idling, reduced engine performance, and potentially a check engine light illumination. If you experience a Hyundai Tucson misfire DTC P0300 or similar, it's important to have your vehicle inspected.
Fault Codes / DTCs
The following misfire DTCs are specifically addressed by TSB 25-FL-001H:
- P0300: Random/Multiple Cylinder Misfire Detected
- P0301: Cylinder 1 Misfire Detected
- P0302: Cylinder 2 Misfire Detected
- P0303: Cylinder 3 Misfire Detected
- P0304: Cylinder 4 Misfire Detected
Diagnosis / Trigger Conditions
Diagnosis for this issue involves performing a fault code search using a diagnostic tool. If one or more of the misfire DTCs (P0300, P0301, P0302, P0303, P0304) are found, and the vehicle falls within the applicable range listed in the TSB, then the GDI injector replacement procedure should be followed. If these specific DTCs are not present, or if the vehicle is not within the applicable range, this TSB does not apply, and normal diagnostic procedures should be used.
Important Warnings for Technicians and Owners
Hyundai provides several critical warnings within TSB 25-FL-001H to ensure proper repair and prevent damage:
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Frequently Asked Questions
- What does Hyundai TSB 25-FL-001H address?
- Hyundai TSB 25-FL-001H addresses misfire diagnostic trouble codes (DTCs) such as P0300, P0301, P0302, P0303, and P0304 in certain 2021-2023 Hyundai models with 2.5L GDI engines. The issue is caused by internally leaking GDI fuel injectors.
- Which Hyundai models are affected by this misfire issue?
- This issue affects 2021-2023 Hyundai Santa Cruz, Santa Fe, Sonata, and Tucson models equipped with the 2.5L GDI Theta III non-turbo engine. If you have a Hyundai Tucson misfire DTC P0300, your vehicle may be included.
- What is the repair for the GDI injector misfire problem?
- The repair involves replacing all four GDI fuel injectors using a specific kit (part number 35399-2S133QQH) and following the detailed procedure outlined in TSB 25-FL-001H. This includes cleaning cylinder head holes and carefully observing all torque specifications.
- Will I be charged for the GDI injector replacement under this TSB?
- The TSB indicates that claims should be submitted as 'Campaign' type. If the affected part is still under warranty, the repair should be covered. For parts out of warranty, a Prior Approval request for goodwill consideration may be necessary. Always confirm warranty coverage with your authorized Hyundai dealer.
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