What does the P030X code mean for my 2021-2022 Hyundai?

A P030X code (e.g., P0301, P0302) in your 2021-2022 Hyundai indicates a misfire detected in a specific cylinder. According to TSB 22-FL-002H, this is often caused by an internally leaking GDI fuel injector.

How is a leaking GDI injector diagnosed in a Hyundai?

Diagnosis involves using the Hyundai Global Diagnostic System (GDS) to check for P030X DTCs and monitor fuel pressure. A key indicator of a `Hyundai GDI leak P030X` is a drop in fuel pressure after the engine is shut off.

Will Hyundai cover the cost of this GDI injector repair?

Yes, if your vehicle is still under warranty, the repair described in TSB 22-FL-002H for the `Hyundai GDI leak P030X` issue should be covered. However, it's crucial that the repair facility follows all warranty claim procedures, including submitting required STUI pictures, to avoid claim denial.

What parts are needed to fix a Hyundai GDI leak P030X?

The repair typically requires a new INJECTOR ASSY-FUEL (part number 35310-2S000QQH) for each affected cylinder, a new PIPE-HIGH PRESSURE (35305-2S000QQH), new COMBUSTION SEAL RINGs (35312-04AA0) for reused injectors, and new BOLTs (11403-08556K).

Hyundai Misfire P030X GDI Injector Leak TSB 22-FL-002H

Hyundai has released Technical Service Bulletin (TSB) 22-FL-002H to address a common issue affecting multiple models equipped with the 2.5L GDI engine. This bulletin specifically targets misfire Diagnostic Trouble Codes (DTCs) in the P030X family, which are often triggered by an internal GDI injector leak. Owners experiencing a Hyundai GDI leak P030X should be aware of this bulletin.

This TSB provides detailed diagnostic and repair procedures for technicians to identify and correct the underlying cause of the misfires, ensuring proper engine function and preventing further issues related to the Hyundai GDI leak P030X.

Symptoms

Owners may notice their check engine light illuminating, accompanied by a noticeable misfire. This can manifest as rough idling, reduced engine power, or hesitation during acceleration. The primary indicator for this specific issue is the presence of a P030X series DTC stored in the vehicle's computer system.

Fault Codes / DTCs

The following Diagnostic Trouble Codes (DTCs) are associated with this issue:

Code	Description
P030X	Misfire Detected (where 'X' indicates the specific cylinder, e.g., P0301 for cylinder 1, P0302 for cylinder 2, etc.)

Diagnosis / Trigger Conditions

Diagnosis for the Hyundai GDI leak P030X begins with checking for the P030X DTC. Technicians will use the Global Diagnostic System (GDS) to access the "DTC Analysis" and "ENGINE" menus, recording any stored DTCs and Freeze Frame Data to identify the affected cylinder(s). After deleting the DTC, the engine is started, and the fuel pressure is monitored using the GDS "Data Analysis" menu.

A key diagnostic step involves shutting off the engine and observing the fuel pressure. If the fuel pressure drops after the engine is turned off, it indicates an internally leaking GDI fuel injector. If the pressure does not drop, the TSB advises that this specific bulletin does not apply, and further misfire diagnostics should be pursued.

Repair Procedure Summary

Once a leaking GDI injector is confirmed, the repair involves replacing the affected injector(s). The procedure, outlined in the shop manual under "Engine Control / Fuel System → Engine Control System → Injector → Repair procedures → GDI Injector," includes several critical steps:

Injector Replacement: The faulty GDI fuel injector(s) on the identified cylinder(s) are replaced.
Combustion Seal Rings: New combustion seal rings (part number 35312-04AA0) must be installed on any reused injectors during reinstallation.
High-Pressure Fuel Pipe: The high-pressure fuel pipe (part number 35305-2S000QQH) must be replaced with a new part after the fuel rail is reinstalled.
Bolts: New bolts (part number 11403-08556K) are required for any replaced injector(s).

After completing the physical repair, technicians are required to upload freeze frame data for future claim verification. The TSB 22-FL-002H emphasizes following these steps precisely.

Required Tools or Parts

To perform the repair for the Hyundai GDI leak P030X issue, the following parts may be required:

Part Name	Part Number	Quantity
INJECTOR ASSY-FUEL	35310-2S000QQH	1 per affected injector
PIPE-HIGH PRESSURE	35305-2S000QQH	1
COMBUSTION SEAL RING	35312-04AA0	1 per reused injector
BOLT	11403-08556K	1-4, only for replaced injector(s)

Warranty claims for this repair use specific operation codes (OP CODES) such as 20DA14R1 (for 1 injector), 20DA14R2 (for 2 injectors), 20DA14R3 (for 3 injectors), and 20DA14R4 (for 4 injectors). The causal part is 35310-2S000, with causal code ZZ5 and nature code I3T.

Important Warnings for Owners

Owners should be aware of specific requirements for warranty claims related to this TSB:

STUI Pictures: This TSB mandates the submission of STUI (Service Technical Update Information) pictures. These pictures must clearly show the replacement injector(s), high-pressure fuel pump, and any reused injector(s) with new combustion seal rings. Crucially, a piece of paper displaying the last 6 digits of the VIN and the date of the repair must be visible in the photos. Claims submitted without these required, clear, and complete STUI pictures are subject to debit, meaning the warranty claim may be denied or reversed.
Parts Callback: Incident parts involved in the repair are subject to callback through the normal Warranty Technical Center (WTC) parts return process. Failure to return requested parts will also result in the claim being subject to debit.
Additional Parts: If any other part not covered by this TSB requires replacement during the repair, and it is still under warranty, a separate claim should be submitted. If the part is out of warranty, prior approval for goodwill consideration is necessary.

Owner Action

If your 2021-2022 Hyundai Sonata, Santa Fe, Santa Cruz, or Tucson is experiencing misfires or has a P030X DTC stored, it is recommended to schedule an appointment with your authorized Hyundai dealer. Inform them about the symptoms and mention Technical Service Bulletin 22-FL-002H. The dealer technician will perform the necessary diagnostic steps to confirm if an internal GDI injector leak is the cause of the Hyundai GDI leak P030X and proceed with the repair as outlined in the TSB.

Source: NHTSA ID: 10225470