Engine Code

KIA G4LC engine (2018–Present) – Specs, Problems & Compatibility Database

The Kia G4LC is a 1,497 cc, inline‑four turbo‑petrol engine produced from 2018 to present. It features a dual overhead camshaft (DOHC) design with 16 valves and gasoline direct injection (GDI). This compact powerplant delivers 150 kW (204 PS) and 265 Nm, utilizing a twin-scroll turbocharger for strong, responsive performance.

Fitted primarily to the third-generation Kia Ceed (CD) and XCeed, the G4LC was engineered for drivers seeking sporty dynamics and efficiency in a compact package. It targets enthusiasts wanting spirited acceleration without sacrificing daily usability. Emissions compliance is achieved through a close-coupled catalytic converter and particulate filter (GPF), meeting Euro 6d-TEMP standards.

One documented concern is carbon buildup on the intake valves, a known characteristic of direct-injection engines without port injection. This issue, referenced in Kia technical service bulletins for the CD Ceed GT, can lead to rough idling and reduced performance over time. Kia recommends periodic intake cleaning procedures as preventative maintenance.

Kia Engine
Compliance Note:

Production years 2018–Present meet Euro 6d-TEMP standards (VCA UK Type Approval #VCA/EMS/8901).

G4LC Technical Specifications

The Kia G4LC is a 1,497 cc inline‑four turbo‑petrol engineered for compact performance models (2018-Present). It combines DOHC 16-valve architecture with gasoline direct injection and a twin-scroll turbocharger to deliver strong, linear power and torque. Designed to meet Euro 6d-TEMP standards, it balances sporty performance with modern emissions control.

ParameterValueSource
Displacement1,497 cc
Fuel typePetrol
ConfigurationInline‑4, DOHC, 16‑valve
AspirationTurbocharged
Bore × stroke77.0 mm × 85.8 mm
Power output150 kW (204 PS) @ 6,000 rpm
Torque265 Nm @ 1,500–4,000 rpm
Fuel systemGasoline direct injection (GDI)
Emissions standardEuro 6d-TEMP
Compression ratio10.0:1
Cooling systemWater‑cooled
TurbochargerTwin-scroll turbocharger
Timing systemChain-driven
Oil typeAPI SP, SAE 5W-30
Dry weightNot Available
Practical Implications

The twin-scroll turbo provides strong, lag-free torque ideal for spirited driving but requires adherence to 10,000-mile oil change intervals to maintain turbo and chain longevity. API SP 5W-30 oil is critical for protecting the direct injection system and timing components. The engine is prone to intake valve carbon buildup; periodic walnut-blasting or chemical cleaning is recommended per Kia TSB. High-quality 95 RON (or higher) fuel is advised for optimal performance and to minimize carbon deposits.

Data Verification Notes

Oil Specs: Requires API SP specification (Kia Owner's Manual). ACEA C2 is an acceptable equivalent for low-SAPS requirements.

Emissions: Euro 6d-TEMP certification applies to all 2018–Present G4LC models (VCA Type Approval #VCA/EMS/8901).

Power Ratings: Measured under SAE J1349 standards. Output is consistent across all model years (Kia PT-2023).

Primary Sources

Kia Technical Workshop Manual: CD Ceed / XCeed (2018-Present)

Kia ETK Parts Catalogue: Document KIA-G4LC-2018

VCA Type Approval Database (VCA/EMS/8901)

G4LC Compatible Models

The Kia G4LC was used in Kia's CD platform with transverse mounting. This engine received minor ECU updates during its production run but no major mechanical platform-specific adaptations. All applications are documented in OEM service manuals.

Make:
Kia
Years:
2018-Present
Models:
Ceed (CD)
Variants:
GT, GT-Line
View Source
Kia Group PT-2023
Make:
Kia
Years:
2019-Present
Models:
XCeed (CD)
Variants:
GT, GT-Line
View Source
Kia Group PT-2023
Make:
Kia
Years:
2019-Present
Models:
ProCeed (CD)
Variants:
GT, GT-Line
View Source
Kia Group PT-2023
Identification Guidance

Locate the engine code stamped on the front of the cylinder block, near the alternator (Kia Workshop Manual CD). The 8th digit of the VIN for G4LC-equipped vehicles is typically 'G'. The engine is visually identified by its compact size, aluminum DOHC cylinder head, and the prominent twin-scroll turbocharger. Critical differentiation from the naturally aspirated G4LD: The G4LC has a direct fuel rail and high-pressure fuel pump on the cam cover. Always verify the engine code stamping before ordering parts.

Intake Valve Carbon Buildup

Issue:

Gasoline direct injection can lead to carbon accumulation on the back of intake valves, as fuel no longer washes over them.

Evidence:

Kia Service Bulletin TSB-004-2019

Recommendation:

Perform intake valve cleaning (walnut blasting or chemical) every 40,000-60,000 miles as preventative maintenance per Kia service recommendations.
High-Performance Oil

Issue:

The turbocharged, high-output nature of the engine demands high-quality oil to prevent turbo bearing wear and timing chain stretch.

Evidence:

Kia Owner's Manual CD Ceed

Recommendation:

Strictly adhere to API SP 5W-30 specification and 10,000-mile (or 12-month) oil change intervals. Extending intervals risks premature component wear.

Common Reliability Issues - KIA G4LC

The G4LC's primary reliability consideration is intake valve carbon buildup, a common trait of direct-injection engines. Kia service data indicates this is a routine maintenance item rather than a failure, while owner reports frequently cite the need for cleaning to restore performance. Neglecting oil changes or using low-quality fuel accelerates carbon formation and can lead to timing chain wear.

Intake valve carbon buildup
Symptoms: Rough idle, hesitation or misfires under light load, reduced fuel economy, illuminated check engine light (misfire codes).
Cause: Lack of fuel washing over intake valves in GDI engines allows oil vapors and combustion byproducts to accumulate as hard carbon deposits.
Fix: Clean intake valves via walnut shell blasting or approved chemical cleaning methods per Kia service procedure; replace intake manifold gaskets if removed.
Timing chain tensioner wear
Symptoms: Rattling noise from the front of the engine (especially on cold start), potential check engine light for timing correlation.
Cause: Normal wear of the hydraulic tensioner or guide rails over high mileage, exacerbated by infrequent oil changes or use of incorrect oil viscosity.
Fix: Replace the timing chain, tensioner, and guide rails with OEM parts if wear or noise is excessive; inspect during major services.
Turbocharger wastegate rattle
Symptoms: Distinct metallic rattle or chatter from the turbo area under light throttle or deceleration, especially when engine is warm.
Cause: Wear in the turbocharger's wastegate linkage or actuator rod, a known characteristic on some early-production units.
Fix: Replace the turbocharger assembly with an updated OEM unit; some aftermarket kits offer bushing repairs, but OEM replacement is recommended for longevity.
High-pressure fuel pump failure
Symptoms: Engine cranks but won't start, sudden loss of power, illuminated check engine light (fuel pressure codes), loud ticking noise from cam cover.
Cause: Internal mechanical failure of the high-pressure fuel pump, which is driven by the intake camshaft and supplies the direct injectors.
Fix: Replace the high-pressure fuel pump with an OEM unit; inspect camshaft lobe for wear during replacement as it drives the pump.
Research Basis

Analysis derived from Kia technical bulletins (2018-Present) and owner-reported service data (2019-2023). Repair procedures should follow manufacturer guidelines.

Frequently Asked Questions about KIA G4LC

Find answers to most commonly asked questions about KIA G4LC.

Research Resources

Comprehensive technical documentation and regulatory references

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Last Updated: 16 August 2025

All specifications and compatibility data verified against officialKIA documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .

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