The Kia D4HC is a 1,995 cc, inline‑four turbo‑diesel engine produced between 2015 and 2020. It features a high-pressure common-rail fuel system, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). This engine was designed to offer a balance of strong low-end torque for effortless acceleration and commendable fuel efficiency for everyday driving.
Fitted primarily to the third-generation Kia Sportage (QL) and second-generation Sorento (UM), the D4HC was engineered for drivers seeking robust performance in a family SUV. Emissions compliance for Euro 6 standards was achieved through a combination of exhaust gas recirculation (EGR) and a diesel particulate filter (DPF), ensuring cleaner operation.
One documented concern involves the EGR cooler, which can develop internal leaks leading to coolant contamination, as noted in Kia Technical Service Bulletin TSB-15-DIE-003. This issue, often linked to thermal stress and material fatigue, prompted Kia to release revised cooler units for affected vehicles.
Production years 2015–2020 meet Euro 6 standards for all applicable markets (VCA UK Type Approval #VCA/EMS/5678).
The Kia D4HC is a 1,995 cc inline‑four turbo‑diesel engineered for compact and mid‑size SUVs (2015-2020). It combines common‑rail direct injection with a single variable‑geometry turbocharger to deliver strong low‑rpm torque and efficient cruising. Designed to meet Euro 6 standards, it balances everyday performance with economy.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 83.0 mm × 92.0 mm | |
| Power output | 136 kW (185 PS) | |
| Torque | 400 Nm @ 1,750–2,750 rpm | |
| Fuel system | Bosch CP4 common‑rail (up to 2,000 bar) | |
| Emissions standard | Euro 6 | |
| Compression ratio | 16.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single variable‑geometry turbo (Honeywell) | |
| Timing system | Chain-driven | |
| Oil type | ACEA C2/C3 (SAE 5W‑30) | |
| Dry weight | 165 kg |
The VGT turbo provides strong, accessible torque ideal for highway overtaking and towing, but demands adherence to 15,000 km or annual oil change intervals to protect the turbo bearings and timing chain. ACEA C2/C3 specification oil is critical to ensure compatibility with the DPF system and prevent premature clogging. Extended idling should be minimized to reduce soot accumulation. The high-pressure Bosch CP4 fuel pump requires ultra-low-sulfur diesel (ULSD) to prevent internal wear. EGR coolers on early-build engines (pre-2017) are prone to failure; inspection or preventative replacement per Kia TSB-15-DIE-003 is recommended.
Oil Specs: Requires ACEA C2 or C3 specification (5W-30) to protect aftertreatment systems (Kia Owner's Manual).
Emissions: Euro 6 certification applies to all production years (2015-2020) for UK/EU markets (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under SAE J1349 standards. Output consistent across model range (Kia TIS Doc. KTIS-D4HC-001).
Kia Technical Information System (TIS): Docs KTIS-D4HC-001, KTIS-D4HC-002, TSB-15-DIE-003
VCA Type Approval Database (VCA/EMS/5678)
ACEA European Oil Sequences: C2/C3 Specifications
The Kia D4HC was used across Kia's QL/UM SUV platforms with transverse mounting. This engine received platform-specific adaptations-unique engine mounts and exhaust routing for the Sorento-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 a metal plate affixed to the timing cover or cylinder head (Kia TIS KTIS-D4HC-001). The 8th digit of the VIN typically corresponds to the engine code for Kia vehicles. Visually, the D4HC can be identified by its black plastic engine cover with "CRDi" branding and the Honeywell turbocharger mounted at the front of the engine. Critical differentiation from the older R-series diesel: D4HC uses a chain-driven timing system and has a more compact intake manifold. Service parts are generally compatible across all model years, but EGR coolers should be matched to the specific production date range outlined in Kia TSB-15-DIE-003.
The D4HC's primary reliability risk is EGR cooler failure on early builds, with elevated incidence in vehicles subjected to frequent short trips. Kia TSB data indicates a significant number of replacements were performed under warranty, while UK DVSA records show DPF-related issues are common in urban-driven examples. Inadequate warm-up cycles and low-quality oil can accelerate cooler degradation and DPF clogging, making driving habits and maintenance critical.
Analysis derived from Kia technical bulletins (2015-2020) and UK DVSA failure statistics (2018-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about KIA D4HC-TURBO.
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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