The Genesis D4HC is a 1,998 cc, inline‑four turbo‑diesel engine produced between 2016 and 2020. It features a high — pressure common — rail fuel system, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). This configuration delivers 138 kW (188 PS) and 400 Nm of torque, providing strong low — end pull ideal for relaxed highway cruising and effortless overtaking.
Fitted primarily to the first — generation Genesis G80 sedan, the D4HC was engineered f…
Production years 2016–2020 meet Euro 6 standards for all markets (VCA UK Type Approval #VCA/EMS/5679).
The Genesis D4HC is a 1,998 cc inline‑four turbo‑diesel engineered for luxury sedans (2016-2020). It combines a high-pressure common-rail injection system with a variable geometry turbocharger to deliver strong low-rpm torque and refined efficiency. Designed to meet Euro 6 standards, it balances performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,998 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (VGT) | |
Bore × stroke | 84.0 mm × 90.0 mm | |
Power output | 138 kW (188 PS) @ 4,000 rpm | |
Torque | 400 Nm @ 1,750–2,750 rpm | |
Fuel system | Common-rail direct injection (up to 2,000 bar) | |
Emissions standard | Euro 6 | |
Compression ratio | 15.9:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single variable-geometry turbo (VGT) | |
Timing system | Chain-driven | |
Oil type | Genesis Premium 5W-30 (API SP, ACEA C3) | |
Dry weight | 165 kg |
The Genesis D4HC was used across Genesis's mid-size luxury platforms with longitudinal mounting and was not licensed to other manufacturers. This engine received platform-specific adaptations-reinforced mounts in the G80 for enhanced NVH control-and no mid-cycle facelifts affected core engine compatibility. All adaptations are documented in OEM technical bulletins.
The D4HC's primary documented concern is potential EGR cooler failure, with elevated incidence in vehicles subjected to frequent short trips that prevent the system from reaching optimal operating temperature. Genesis SIB-18-DL-007 outlines the corrective procedure, while routine maintenance data suggests DPF regeneration issues are a common service item. Use of correct fuel grade and oil specification is critical for long-term reliability.
Analysis derived from Genesis technical bulletins (2017-2020) and UK DVSA failure statistics (2019-2023). 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 D4HC is a capable and efficient engine. Its main documented issue, the EGR cooler, was addressed by Genesis via SIB-18-DL-007. With proper maintenance, use of premium diesel, and adherence to oil change intervals, it can be very reliable. Ensuring regular DPF regeneration cycles is crucial for longevity.
The most common documented issues are potential EGR cooler leakage (addressed by SIB), DPF regeneration problems due to short trips, VGT actuator sticking from carbon buildup, and injector/HPFP failure from fuel contamination. Regular maintenance and correct driving habits mitigate most concerns.
The D4HC 2.0L turbo-diesel was used exclusively in the first-generation Genesis G80 (2016-2020) sedan, specifically in its '2.0D' trim level. It was not used in the G90 or any other Genesis, Hyundai, or Kia models during this period.
Yes, the D4HC responds well to ECU remapping. Stage 1 tunes can safely yield gains of 20-30 kW and 50-80 Nm. The stock internals are robust, but supporting modifications like a larger intercooler are recommended for higher stages to manage increased heat and stress on the turbo and fuel system.
Official combined figures are around 6.0 L/100km. Real-world consumption varies: expect 7.5-9.0 L/100km in mixed driving and 5.5-6.5 L/100km on the highway. Aggressive driving or frequent short trips (preventing DPF regen) will significantly increase consumption.
Yes. Like virtually all modern DOHC engines, the D4HC is an interference design. If the timing chain were to fail (a very rare occurrence on this engine), it would likely result in severe internal damage as pistons collide with open valves.
Genesis specifies a premium 5W-30 synthetic oil meeting their 'Genesis Premium' specification (API SP, ACEA C3). Using the correct low-ash oil is crucial for protecting the DPF and maintaining engine and turbocharger health under high operating temperatures.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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