2.5L DOHC 16-Valve Engine Assembly for 2023 Hyundai Sonata
Product Notes Read before buying
Voice or type your vehicle details and Wrenchy will confirm fitment in seconds.
Vehicle Fitment Guide
This part fits the following vehicles:
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| Preferred | Sedan | 2023 | L4 2.5L | FWD | Automatic |
| SE | Sedan | 2023 | L4 2.5L | FWD | Automatic |
| SEL | Sedan | 2023 | L4 2.5L | FWD | Automatic |
Know This Engine Before You Buy
The research behind our purchase interview — recalls, bulletins and real install economics for this engine family:
A quick look at your own vehicle makes sure the right engine shows up:
- Verify the 8th digit of the VIN is 'A'.
- Verify the engine code stamped on the block is 'G4KN'.
- Confirm the vehicle is Front-Wheel Drive (FWD).
- Confirm the engine cover is marked as a 2.5L engine.
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- High-pressure fuel line quick-disconnect tool
- GDI fuel injector puller/installer tool
- Bi-directional OBD2 diagnostic scan tool
Budget for these consumables at install:
- SAE 0W-20 Full Synthetic engine oil (approx. 5.9 quarts)
- New OEM Hyundai oil filter
- Hyundai-approved Pink Antifreeze/Coolant (ethylene glycol-based, phosphate-organic acid technology)
- Brand-new high-pressure fuel line (Part # 35305-2S000QQH)
- New intake manifold gasket, exhaust manifold gasket, and ITM O-rings
- New OE-spec iridium spark plugs
- GDI injector Teflon combustion chamber seal rings (Part # 35312-04AA0) if transferring injectors
What your vehicle’s computers will need after the swap:
What’s involved: Crankshaft Position (CKP) sensor variation relearn, Engine Control Module (ECM) software calibration update, and Immobilizer re-marriage / VIN programming.
Requires a dealer-level diagnostic tool (such as Hyundai GDS) or a high-end bi-directional scan tool to perform the CKP sensor relearn, initiate the electronic coolant bleeding utility for the ITM module, and complete the immobilizer re-marriage procedure to prevent a no-start condition.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Mandatory High-Pressure Fuel Pipe Replacement: The high-pressure fuel pipe is a one-time-use component. Reusing it will prevent a proper seal, resulting in a severe high-pressure fuel leak over a hot engine.
- Electronic ITM Coolant Bleeding: The Integrated Thermal Management Module (ITM) controls coolant flow electronically. You cannot bleed this cooling system manually; you must use a bi-directional scan tool to command the ITM valves open. Failing to do so traps air pockets, causing immediate engine overheating.
- GDI Injector Teflon Seals: If transferring original GDI fuel injectors, you must replace the Teflon combustion chamber seal rings using a special resizing tool to avoid compression leaks and misfires.
- Fragile Catalytic Converter: If the original engine failed, inspect the original exhaust manifold/catalytic converter for loose debris that could be drawn back into the cylinders of the new engine.
Easy to get right once you know them:
- Reusing the one-time-use high-pressure fuel line, leading to dangerous fuel leaks.
- Attempting to bleed the cooling system manually without a scan tool to control the ITM module, causing localized hot spots and rapid engine failure.
- Ordering this naturally aspirated engine (VIN A) to replace a 2.5L Turbo (VIN C) or trying to fit it into a Santa Fe or Tucson where mounting brackets and oil pans differ.
- Skipping the ECU/Immobilizer programming, resulting in a no-start condition.
- Reusing old gaskets, seals, or the thermostat to save money.
- Failing to inspect the catalytic converter for debris after an internal engine failure.
Not issues with the units on this page — the manufacturer documented these for every engine of this family, wherever you buy one. Handy for your installer:
🔎 Recommended at install: Replace fuel injectors with updated, leak-resistant versions.
🔎 Recommended at install: Replace the electronic ITM module to prevent cooling system performance issues and overheating.
🔎 Recommended at install: Address pin tension at electrical joint connector JE202 to resolve intermittent sensor signals and limp-mode.
🔎 Recommended at install: Regularly monitor oil levels; check oil at every fuel fill-up.
🔎 Recommended at install: Update the Engine Control Module (ECM) software.
🔎 Recommended at install: Diagnose potential P0451 diagnostic code related to the fuel vapor/evap system.
Researched from factory recalls, TSBs and OEM service data (reference unit 300-10732-5342519). Unit-specific details — mileage, condition, warranty, freight — are covered in the checkout interview.
Policies, in plain English.
Shipping & Handling
- Ships by LTL freight on a pallet — a real freight truck, not a parcel van
- Your checkout freight quote covers delivery to your door (liftgate service included for residential addresses)
- The carrier calls ahead to schedule a delivery window — someone must be present to receive it
- Typically palletized and picked up within 2–3 business days; transit time depends on distance
120-Day Warranty
This part includes a 120-day warranty.
- If the part fails within the warranty window, we'll replace it or refund per the coverage terms
- Coverage is parts-only — installation labor is not included
- Warranty covers defects — not installation errors, misuse, or damage after installation
Your pre-purchase interview reviews these exact terms with you before anything is charged.
Returns (30 Days)
We accept returns of uninstalled parts within 30 days of delivery for this part.
- Defective parts: We will replace the part or issue a refund at our discretion
- Programming: "Needs to be programmed to my vehicle" is not a valid return reason. Many modules require dealer programming — we're happy to help connect you with resources if your dealer says it's not programmable
- Return shipping: This part ships by freight (LTL) — the part price is refundable per the terms above, but shipping costs are non-refundable and return freight follows the seller's return terms. Your pre-purchase interview walks through the exact numbers before you buy
- Parts must be returned in original packaging and unmodified condition
- Poorly packaged returns that arrive damaged will not be credited
Damaged in Shipping?
Freight damage is rare — and you're fully protected when you do two things at delivery:
- Inspect before you sign — you're allowed time to look the pallet over while the driver waits
- Write any damage on the delivery receipt before signing — that one line is what makes a freight claim succeed
- Severe damage? Refuse the delivery — it goes back at no cost to you and we make it right
- Photograph the pallet before unwrapping; report concealed damage within 24 hours of delivery
We handle the carrier claim — you just help document it. Your pre-purchase interview walks through this checklist too.
Order Cancellation
Cancel before shipment for a full refund. Once the pallet has been built, a preparation charge may apply — and once the freight carrier picks it up, shipping costs are non-refundable and standard return terms apply. Your pre-purchase interview shows the exact numbers before you pay.
Expert Guides
2023 Hyundai Sonata 2.5L Smartstream GDi: Problems, Identification, and Used Replacement
Identify the G4KN engine, understand what causes it to fail, and learn what to look for when buying a used OEM replacement unit.
Read Full Guide →Related Trouble Codes (OBD-II)
3 matching guidesIf your scan tool is showing one of these trouble codes, this part is a common fix. Each guide explains the code, how to diagnose it, and exactly what to replace.
Miscellaneous Information
OEM Part Numbers:
Hyundai: 1X11M2SA03, 1X11M2SA04, 1X11M2SA05, 1X13M2SA01
Fits Years: 2023
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Backed By The Selling Yard
This unit ships with the selling yard's 120-day warranty. Longer plans can be requested during checkout.
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