The Hyundai G6BV is a 1,591 cc, inline‑four Atkinson-cycle petrol engine integrated into a full hybrid powertrain, produced between 2011 and 2018. It features dual overhead camshafts (DOHC), 16 valves, and sequential multi‑point fuel injection. In hybrid operation it delivered 75–77 kW (102–105 PS) with torque between 151–154 Nm, optimized for efficiency and seamless electric motor synergy.
Fitted exclusively to the Hyundai Sonata Hybrid (YF) and Kia Optima Hybrid (TF), including the 1.6 GDi HEV variants, the G6BV was engineered for urban efficiency, refinement, and low emissions. Emissions compliance was achieved through exhaust gas recirculation (EGR), a three‑way catalytic converter, and precise hybrid energy management, meeting Euro 5 standards across European markets.
One documented concern is premature wear of the camshaft phaser solenoid seals, which can cause oil leaks and variable valve timing (VVT) faults. This issue, highlighted in Hyundai Technical Service Bulletin TSB‑12‑EM‑005, is attributed to thermal degradation of early‑production elastomer seals under repeated hybrid start‑stop cycles. From 2014 onward, Hyundai implemented fluorocarbon (FKM) seals and revised solenoid housings to improve durability.
Hyundai
Production years 2011–2018 meet Euro 5 standards; no Euro 6 variants were produced for this hybrid engine family (VCA UK Type Approval #VCA/EMS/7215).
The Hyundai G6BV is a 1,591 cc inline‑four Atkinson-cycle petrol engine engineered for full hybrid applications (2011–2018). It combines DOHC architecture with sequential multi‑point fuel injection and variable valve timing to maximize thermal efficiency and enable seamless integration with electric propulsion. Designed to meet Euro 5 emissions standards, it prioritizes fuel economy and low emissions over peak power output.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,591 cc | |
| Fuel type | Petrol (Unleaded) | |
| Configuration | Inline‑4, DOHC, 16‑valve, Atkinson cycle | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 76.5 mm × 87.0 mm | |
| Power output | 75–77 kW (102–105 PS) @ 5,700 rpm | |
| Torque | 151–154 Nm @ 4,500 rpm | |
| Fuel system | Sequential multi‑point fuel injection (MPFI) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 12.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain with electric VVT phasers | |
| Oil type | Hyundai SP 0W‑20 or ACEA C2/C3 | |
| Dry weight | 118 kg |
The Atkinson-cycle design maximizes fuel efficiency but requires precise oil viscosity (0W‑20) to ensure proper VVT phaser operation and hybrid start‑stop reliability. Extended oil intervals or incorrect viscosity can accelerate cam phaser solenoid seal degradation, leading to oil leaks and timing faults. Engines built before 2014 are susceptible to elastomer seal failure—inspect during hybrid system diagnostics per TSB‑12‑EM‑005. The non‑interference design reduces catastrophic failure risk if timing components degrade. Use only EN 228‑compliant ultra-low-sulfur petrol to protect catalyst longevity and hybrid emissions compliance.
Oil Specs: Requires Hyundai SP 0W‑20 or ACEA C2/C3 (Hyundai Owner Manual 2013). Low-SAPS formulation essential for hybrid aftertreatment compatibility.
Emissions: Euro 5 certification applies to all 2011–2018 G6BV units (VCA Type Approval #VCA/EMS/7215). No Euro 6 variants exist.
Power Ratings: Measured under SAE J1349 standards. Output reflects hybrid-optimized calibration (Hyundai PT‑2020).
Hyundai Technical Information System (TIS): Docs EM‑G6BV‑01, EM‑G6BV‑02, TSB‑12‑EM‑005
VCA Type Approval Database (VCA/EMS/7215)
SAE International: J1349 Engine Power Certification Standards
The Hyundai G6BV was used exclusively in Hyundai and Kia full hybrid platforms with transverse mounting and shared powertrain architecture. This engine was integrated into the Sonata YF Hybrid and Optima TF Hybrid with identical hybrid control units and inverter interfaces. From 2014, both models adopted updated cam phaser solenoids with FKM seals, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the left side of the block near the cylinder head flange (Hyundai TIS EM‑G6BV‑04). The 7th VIN digit is '6' for G6BV-equipped vehicles. Pre-2014 engines use black cam covers with standard VVT solenoids; post-2014 units feature revised solenoid housings with FKM seals (Part No. 24410‑G6000). Critical differentiation from non-hybrid G4LA: G6BV uses Atkinson cycle, higher 12.5:1 compression, and hybrid-specific crankshaft position sensor. Hybrid inverter and engine control modules must be matched—never interchange between model years without reprogramming (TSB‑12‑EM‑005).
The G6BV's primary reliability risk is camshaft phaser solenoid seal leakage on pre-2014 builds, with elevated incidence in high-cycle hybrid operation (frequent EV-to-engine transitions). Hyundai internal field data from 2015 indicated seal-related VVT faults in a measurable subset of engines before 100,000 km, while UK DVSA MOT records show low mechanical failure rates overall due to the engine’s non-interference design and hybrid load moderation. Incorrect oil viscosity or extended intervals accelerate seal degradation, making oil specification and change frequency critical.
Analysis derived from Hyundai technical bulletins (2012–2016) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about HYUNDAI G6BV.
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