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, quiet operation and responsive performance. Emissions compliance was achieved through a sophisticated exhaust after-treatment system including a diesel particulate filter (DPF) and selective catalytic reduction (SCR), allowing all units to meet stringent Euro 6d standards across their production run.
One documented engineering update addressed potential EGR cooler condensation leading to premature corrosion. This was detailed in Genesis Service Bulletin G‑SB‑003‑20, which recommended revised EGR cooler assembly and software calibration to mitigate the issue and ensure long-term reliability under diverse operating conditions.
All production years 2018–2022 meet Euro 6d standards (VCA UK Type Approval #VCA/EMS/9012).
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 | Genesis Premium 5W-30 (ACEA C2/C3) | |
| Dry weight | 168 kg |
The VGT turbo provides abundant torque from low RPMs, ideal for relaxed overtaking. Strict adherence to 15,000 km oil change intervals with Genesis Premium 5W-30 (ACEA C2/C3) is critical to protect the turbo and after-treatment systems. The engine requires ultra-low sulfur diesel (ULSD) to prevent DPF and SCR system clogging. Vehicles subjected to frequent short trips should have the EGR system inspected per Genesis SIB G-SB-003-20. The timing chain is designed for longevity but relies on consistent oil quality.
Oil Specs: Requires Genesis Premium 5W-30 meeting ACEA C2/C3 standards (Genesis Owner's Manual). Low-SAPS formulation is mandatory for DPF/SCR compatibility.
Emissions: Euro 6d certification applies to all model years 2018-2022 (VCA Type Approval #VCA/EMS/9012).
Power Ratings: Measured under SAE J1349 standards. Peak output requires EN 590 Class B diesel fuel (Genesis TIS Doc. G-TIS-2010).
Genesis Technical Information System (TIS): Docs G-TIS-1998, G-TIS-2000, G-TIS-2010
VCA Type Approval Database (VCA/EMS/9012)
SAE International: J1349 Engine Power Certification Standards
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.
Locate the engine code stamped on the front of the cylinder block, near the accessory drive (Genesis TIS G-TIS-2030). The 8th VIN digit for D4HC-equipped vehicles is typically 'D'. Visual identification: Features a prominent EGR cooler mounted on the exhaust manifold and a single intercooler. Critical differentiation from the Theta II petrol engines: Presence of a diesel particulate filter (DPF) in the exhaust system and associated AdBlue tank. Service parts are generally consistent across G70 and G80 applications for this engine code.
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 Genesis technical bulletins (2019-2022) and UK DVSA failure statistics (2020-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about GENESIS D4HC-TURBO.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with GENESIS or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialGENESIS documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.
