The Genesis G4KH is a 3,342 cc, V6 twin — turbocharged petrol engine produced between 2016 and 2020. It features gasoline direct injection, dual overhead camshafts (DOHC), and variable valve timing on both intake and exhaust. This powerplant delivers strong, linear power for luxury performance, with outputs ranging from 272 kW (365 PS) to 294 kW (395 PS) and torque figures between 510–530 Nm.
Fitted primarily to the G80 and G90 sedans, the G4KH was engineered for refined po…
Genesis
All production years 2016–2020 meet Euro 6 standards (VCA UK Type Approval #VCA/EMS/5678).
The Genesis G4KH is a 3,342 cc V6 twin-turbocharged petrol engineered for luxury sedans (2016-2020). It combines gasoline direct injection with twin variable-geometry turbochargers to deliver smooth, high-output performance and responsive torque. Designed to meet Euro 6 standards, it balances grand touring capability with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,342 cc | |
Fuel type | Petrol | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Twin-turbocharged | |
Bore × stroke | 92.0 mm × 83.8 mm | |
Power output | 272–294 kW (365–395 PS) | |
Torque | 510–530 Nm @ 1,300–4,500 rpm | |
Fuel system | Gasoline direct injection (GDI), high-pressure pump | |
Emissions standard | Euro 6 | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Twin variable-geometry turbochargers (Honeywell) | |
Timing system | Chain-driven | |
Oil type | Genesis Premium 5W-30 (API SP) | |
Dry weight | 215 kg |
The Genesis G4KH was used across Genesis's G80 and G90 platforms with longitudinal mounting. This engine received platform-specific adaptations-unique engine mounts and exhaust routing for the G90-but no major facelift revisions occurred during its production run, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
The G4KH's primary documented service focus is potential high-pressure fuel pump (HPFP) wear, with elevated incidence in vehicles used for sustained high-speed driving or towing. Genesis SIB G-SB-001-18 outlines the condition, while general maintenance records indicate that adherence to oil and fuel specifications is the most significant factor in long-term reliability. Neglecting these can accelerate wear on turbos and the fuel system.
Analysis derived from Genesis technical bulletins (2017-2020) and UK DVSA failure statistics (2018-2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The G4KH is a robust and powerful engine. Its main documented concern is the high-pressure fuel pump, addressed by a service bulletin. With strict adherence to using premium fuel and Genesis-specified 5W-30 oil with regular changes, it demonstrates excellent long-term reliability. Most issues arise from neglected maintenance.
The most common documented issues are potential high-pressure fuel pump wear, carbon buildup on intake valves (a GDI trait), and occasional turbo wastegate rattle on early builds. Oil consumption within specified limits is also noted. These are covered in Genesis service information.
The G4KH 3.3L twin-turbo V6 was used in the first-generation Genesis G80 sedan (2016-2020) and the first-generation Genesis G90 flagship sedan (2016-2020). It was the performance petrol engine for these models, positioned above the naturally aspirated V6.
Yes, the G4KH has significant tuning potential. ECU remaps can safely increase output by 30-50 kW, leveraging the robust stock internals and twin-turbo setup. Supporting modifications like an upgraded intercooler and downpipes are common for higher stages. Always use a reputable tuner.
As expected for a twin-turbo V6, economy is moderate. In a G80 3.3T, expect around 11.5 L/100km in mixed driving (approx. 25 mpg UK). Highway cruising can yield 8.5-9.0 L/100km (31-33 mpg UK). Aggressive driving or city use will increase consumption significantly.
Yes. Like virtually all modern overhead cam engines, the G4KH is an interference design. If the timing chain were to fail catastrophically, valve and piston collision would cause severe internal engine damage. Fortunately, the chain is very durable with proper oil maintenance.
Genesis mandates a premium 5W-30 synthetic oil meeting their specific 'Genesis Premium' standard, which is equivalent to API SP and ILSAC GF-6A. Using the correct oil is paramount for turbo longevity and preventing carbon buildup. Change intervals should not exceed 10,000 km.
Comprehensive technical documentation and regulatory references
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GENESIS Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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