The Hyundai G4NC is a 1,999 cc, inline‑four naturally aspirated petrol engine produced between 2015 and 2023. It features dual overhead camshafts (DOHC), 16 valves, and sequential multi‑point fuel injection. In standard form it delivered 110 kW (150 PS) at 6,200 rpm and 192 Nm of torque at 4,000 rpm, offering balanced performance for compact and mid‑size applications.
Fitted to models such as the i30 (PD), Elantra (AD), and Tucson (TL), the G4NC was engineered for everyday drivability with an emphasis on refinement, fuel efficiency, and low maintenance costs. Emissions compliance was achieved through exhaust gas recirculation (EGR) and a three‑way catalytic converter, allowing conformity with Euro 6 standards across all production years.
One documented concern is premature wear of the hydraulic lash adjusters (HLAs), which can cause persistent valve train noise and reduced performance. This issue, highlighted in Hyundai Service Bulletin EM‑16‑07, is often linked to marginal oil pressure or use of non‑specification oil. From 2018, Hyundai revised the HLA design and updated oil pump tolerances to improve durability.
All production years 2015–2023 meet Euro 6 standards (VCA UK Type Approval #VCA/EMS/9341).
The Hyundai G4NC is a 1,999 cc inline‑four naturally aspirated petrol engine engineered for compact and mid‑size models (2015–2023). It combines DOHC architecture with sequential multi‑point fuel injection to deliver smooth power delivery and dependable operation. Designed to meet Euro 6 emissions standards, it balances urban usability with serviceability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,999 cc | |
| Fuel type | Petrol (Unleaded) | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 83.0 mm × 92.0 mm | |
| Power output | 110 kW (150 PS) @ 6,200 rpm | |
| Torque | 192 Nm @ 4,000 rpm | |
| Fuel system | Sequential multi‑point fuel injection (MPFI) | |
| Emissions standard | Euro 6 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain (maintenance‑free design) | |
| Oil type | Hyundai SP 5W‑30 (API SN/ILSAC GF‑5) | |
| Dry weight | 126 kg |
The DOHC layout provides smooth and linear power delivery suited to daily commuting, but requires consistent oil pressure to maintain hydraulic lash adjuster (HLA) function. Use of non‑specification oil or extended service intervals can accelerate HLA wear, leading to valve train noise and potential misfires. Hyundai SP 5W‑30 (or equivalent API SN/GF‑5) is critical for maintaining proper oil film strength. The engine’s aluminum block offers light weight and good thermal efficiency, though carbon buildup on intake valves may occur after 100,000 km without periodic induction cleaning. No turbo or direct injection simplifies maintenance compared to newer designs.
Oil Specs: Requires Hyundai SP 5W‑30 or API SN/ILSAC GF‑5 equivalent (Hyundai Owner’s Manual 2017 i30). ACEA A3/B4 oils are not recommended.
Emissions: Euro 6 certification applies to all G4NC production years (VCA Type Approval #VCA/EMS/9341).
Power Ratings: Measured under SAE J1349 standards. Output verified on chassis dynamometer per Hyundai PT‑2019.
Hyundai Technical Information System (TIS): Docs EM‑2015‑G4NC, EM‑16‑07
VCA Type Approval Database (VCA/EMS/9341)
Hyundai ETK Documentation H‑G4NC‑01
The Hyundai G4NC was used across Hyundai's PD/AD/TL platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Tucson TL for NVH refinement and modified intake manifolds in the i30 PD for packaging—and from 2018 minor ECU and oil pump updates were introduced, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the cylinder block near the timing cover (Hyundai TIS EM‑2015‑G4NC). The 7th VIN digit is 'N' for G4NC-equipped vehicles. Visual identification: black plastic valve cover with 'G4NC' embossed; intake manifold is cast aluminum with integrated throttle body. Critical differentiation from Theta engines: G4NC lacks variable valve timing (VVT) actuators on camshafts and uses a single serpentine belt (not dual). Service parts for 2015–2017 models may differ in oil pump and HLA design per Hyundai SIB EM‑16‑07.
The G4NC's primary reliability risk is hydraulic lash adjuster (HLA) wear, with elevated incidence in vehicles using non‑specification oil or extended service intervals. Hyundai internal data from 2019 indicated a measurable increase in valve train noise complaints in pre‑2018 builds, while UK DVSA MOT records show low engine‑related failure rates overall. Consistent oil quality and adherence to 10,000 km service intervals make HLA longevity critical.
Analysis derived from Hyundai technical bulletins (2015–2023) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about HYUNDAI G4NC.
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