The Genesis D4HC is a 1,998 cc, inline‑four turbo‑diesel engine produced between 2018 and 2022. It features a high — pressure common — rail fuel system, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). This powerplant delivers strong low — end torque for effortless urban driving, with outputs ranging from 147 kW (197 PS) to 150 kW (201 PS) and a consistent 440 Nm.
Fitted exclusively to the G70 and G80 sedans, the D4HC was engineered for refined, qui…
All production years 2018–2022 meet Euro 6d standards .
The Genesis D4HC is a 1,998 cc inline‑four turbo‑diesel engineered for luxury sedans (2018-2022). It combines high-pressure common-rail direct injection with a single variable-geometry turbocharger to deliver strong, accessible torque and quiet, refined operation. Designed to meet Euro 6d standards, it balances performance with stringent environmental compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,998 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 84.0 mm × 90.0 mm | |
Power output | 147–150 kW (197–201 PS) | |
Torque | 440 Nm @ 1,750–2,750 rpm | |
Fuel system | Common-rail direct injection (up to 2,000 bar) | |
Emissions standard | Euro 6d | |
Compression ratio | 15.8:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single variable-geometry turbocharger (Honeywell) | |
Timing system | Chain-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 168 kg |
The Genesis D4HC was used across Genesis's G70 and G80 platforms with longitudinal mounting. This engine received platform-specific adaptations-unique engine mounts and exhaust routing for the G70-but no major facelift revisions occurred during its production run, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
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The D4HC's primary documented service focus is potential EGR cooler corrosion, with elevated incidence in vehicles operating in cold, humid climates. Genesis SIB G-SB-003-20 outlines the condition, while general maintenance records indicate that adherence to fuel and oil specifications is the most significant factor in long-term reliability. Neglecting these can accelerate wear on the after-treatment system.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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 D4HC is a modern, powerful diesel engine. Its main documented concern is the EGR cooler, addressed by a service bulletin. With strict adherence to using ultra-low sulfur diesel and Genesis-specified 5W-30 oil with regular changes, it demonstrates excellent long-term reliability. Most issues arise from neglected maintenance or unsuitable driving patterns for a diesel.
The most common documented issues are potential EGR cooler corrosion, DPF clogging from short trips, AdBlue system faults, and occasional turbo actuator problems. These are covered in Genesis service information and are manageable with proper maintenance and driving habits.
The D4HC 2.2L turbo-diesel was used in the first-generation Genesis G70 sports sedan (2018-2022) and the second-generation Genesis G80 executive sedan (2018-2022). It was the sole diesel engine option for these models in markets where diesel was offered.
Aftermarket ECU tuning is common on the D4HC-TURBO platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Excellent for a luxury sedan. In a G80 2.2D, expect around 7.0-7.5 L/100km in mixed driving (approx. 40-38 mpg UK). Highway cruising can yield 5.5-6.0 L/100km (51-47 mpg UK). City driving or aggressive use will increase consumption, and frequent short trips will negatively impact economy due to DPF regenerations.
Yes. Like virtually all modern overhead cam engines, the D4HC 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 aligns with ACEA C2/C3. This low-SAPS (Sulphated Ash, Phosphorus, Sulphur) oil is mandatory to protect the DPF and SCR systems. Change intervals should not exceed 15,000 km.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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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