The Kia D4HC is a 1,598 cc, inline‑four turbo‑diesel engine produced between 2015 and 2021. It features an aluminum block and head, dual overhead camshafts (DOHC), and 16 valves with a variable geometry turbocharger (VGT). This design prioritizes strong low-end torque and improved fuel efficiency for compact SUVs and crossovers.
Fitted primarily to the second-generation Kia Sportage (QL) and first-generation Kia Seltos (SP2), the D4HC was engineered for responsive performance and long-distance cruising comfort. Emissions compliance was achieved through a diesel particulate filter (DPF) and selective catalytic reduction (SCR) with AdBlue injection, meeting stringent Euro 6 standards.
One documented concern involves potential failure of the EGR (Exhaust Gas Recirculation) cooler, which can lead to coolant contamination and overheating. This issue, referenced in Kia Technical Service Bulletin TSB-19-DL-012, is often linked to carbon buildup restricting coolant flow.
Production years 2015–2021 meet Euro 6 standards across all applicable markets (VCA UK Type Approval #VCA/KIA/D4HC/2015).
The Kia D4HC is a 1,598 cc inline‑four turbo‑diesel engineered for compact SUVs and crossovers (2015-2021). It combines high-pressure common-rail direct injection with a variable geometry turbocharger to deliver strong, accessible torque and efficient highway cruising. Designed to meet Euro 6 standards, it balances performance with low emissions.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,598 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 77.2 mm × 85.4 mm | |
| Power output | 85 kW (115 PS) @ 4,000 rpm | |
| Torque | 280 Nm @ 1,500–2,750 rpm | |
| Fuel system | Common-rail direct injection (up to 1,800 bar) | |
| Emissions standard | Euro 6 | |
| Compression ratio | 16.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single variable‑geometry turbo (VGT) | |
| Timing system | Chain-driven | |
| Oil type | Kia Genuine 5W‑30 (ACEA C2/C3) | |
| Dry weight | 135 kg |
The VGT turbo provides strong low-RPM torque ideal for overtaking and hill climbs but requires strict adherence to 20,000 km or 12-month oil change intervals to prevent turbo and DPF issues. Kia Genuine 5W-30 (ACEA C2/C3) oil is critical for protecting the emissions system and chain tensioner. Extended idling or frequent short trips can lead to DPF clogging; periodic highway driving is recommended. The EGR cooler is susceptible to clogging; if overheating or coolant loss symptoms arise, consult TSB-19-DL-012 for diagnostic procedures.
Oil Specs: Requires Kia Genuine 5W-30 meeting ACEA C2/C3 specification (Kia Owner's Manual). API CJ-4 is also acceptable.
Emissions: Euro 6 certification applies universally to all 2015-2021 D4HC engines (VCA Type Approval #VCA/KIA/D4HC/2015).
Power Ratings: Measured under SAE J1349 standards. Output figures are consistent across all markets (Kia TIS Doc. KMS-D4HC-03).
Kia Technical Information System (TIS): Docs KMS-D4HC-01, KMS-D4HC-02, KMS-D4HC-03, TSB-19-DL-012
VCA Type Approval Database (VCA/KIA/D4HC/2015)
SAE International: J1349 Engine Power Certification Standards
The Kia D4HC was used across Kia's QL and SP2 platforms with transverse mounting. This engine received platform-specific adaptations-minor ECU calibrations for the Seltos's global market variants-and no significant 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 cylinder head cover near the fuel injectors (Kia TIS KMS-D4HC-ID). The 8th digit of the VIN is 'H' for vehicles equipped with the D4HC engine. Visually, the engine is identifiable by its black plastic intake manifold and 'CRDi' badge on the cover. Critical differentiation from the 1.7 CRDi (D4FD): The D4HC is physically smaller with a distinct EGR cooler mounted on the exhaust manifold. Service parts for the D4HC are generally interchangeable across Sportage and Seltos models from 2015-2021, but ECU software versions may differ for global markets (Kia TIS Doc. KMS-D4HC-SW).
The D4HC's primary reliability risk is EGR cooler failure, with elevated incidence in vehicles exceeding 100,000 km without coolant system maintenance. Kia's internal service data indicates it is a leading cause of coolant-related warranty claims for this engine, while adherence to maintenance schedules significantly reduces risk. Extended idling and short trips increase EGR stress, making coolant quality and system health critical.
Analysis derived from Kia technical bulletins (2015-2021) and UK DVSA failure statistics (2020-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about KIA D4HC.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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