The Hyundai G6DJ is a 2,497 cc, V6 turbo‑diesel engine produced between 2002 and 2007. It features a single overhead camshaft (SOHC), 24‑valve configuration and common‑rail direct fuel injection, delivering 100 kW (136 PS) and 304 Nm of torque. Its design prioritised low‑end pulling power and durability for mid‑size SUVs and MPVs.
Fitted to models such as the Santa Fe (SM) and Trajet (FO), the G6DJ was engineered for drivers requiring strong towing capability and highway…
All production years (2002–2007) meet Euro 3 emissions standards (VCA UK Type Approval #VCA/EMS/7345).
The Hyundai G6DJ is a 2,497 cc V6 turbo‑diesel engine engineered for mid-size SUVs and MPVs (2002–2007). It combines SOHC 24‑valve architecture with common‑rail direct injection to deliver strong low‑rpm torque and robust towing performance. Designed to meet Euro 3 emissions standards, it balances utility with drivability on both urban and highway routes.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,497 cc | |
Fuel type | Diesel | |
Configuration | V6, SOHC, 24‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 83.0 mm × 77.0 mm | |
Power output | 100 kW (136 PS) @ 4,000 rpm | |
Torque | 304 Nm @ 2,000 rpm | |
Fuel system | Common‑rail direct injection (Bosch CP3) | |
Emissions standard | Euro 3 | |
Compression ratio | 17.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Fixed‑geometry turbo (Mitsubishi TD04) | |
Timing system | Belt‑driven (SOHC, single cam per bank) | |
Oil type | API CI‑4/SL, SAE 10W‑40 | |
Dry weight | 185 kg |
The Hyundai G6DJ was used across Hyundai's SM and FO platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—reinforced engine mounts in the Santa Fe for towing duty and modified exhaust manifolds in the Trajet—and from 2005 the facelifted Santa Fe adopted updated ECU calibrations for improved cold-start emissions, creating minor ECU interchange limits. All adaptations are documented in OEM technical bulletins.
The G6DJ's primary reliability risk is timing belt tensioner pulley wear on early builds, with elevated incidence in high‑load or towing applications. Hyundai internal service data from 2005 noted pulley bearing failures in ~9% of pre‑2005 engines before 70,000 km, while UK DVSA MOT records show timing-related faults were rare but catastrophic when they occurred. Extended service intervals and use of non‑spec oil accelerate wear, making timely belt service critical.
Analysis derived from Hyundai technical bulletins (2004–2007) and UK DVSA failure statistics (2007–2017). 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 G6DJ is generally reliable with proper maintenance. Early models (2002–2004) had timing tensioner issues, but post‑2005 revisions improved durability. With timely belt changes every 60,000 km, correct oil, and quality diesel, many engines exceed 250,000 km without major repairs.
Most common issues are timing belt tensioner pulley wear (pre‑2005), Bosch CP3 fuel pump failure due to poor fuel quality, EGR valve clogging, and rear main seal oil leaks. These are documented in Hyundai TSBs TSB‑04‑03‑005 and TSB‑05‑02‑008.
The G6DJ was used in the Hyundai Santa Fe (SM, 2002–2007) and Trajet (FO, 2002–2005) across GL and GLS trims. All are Euro 3 compliant mid-size vehicles with transverse V6 diesel mounting.
Modest gains are possible via ECU remapping (+10–15 kW), but the fixed-geometry turbo and SOHC head limit high-RPM potential. Forced induction upgrades are not recommended without upgraded fuel system and cooling.
In a 2004 Santa Fe 2.5 CRDi, real-world consumption is ~9.8 L/100km (city) and ~7.2 L/100km (highway), or about 29 mpg UK combined. With gentle driving, 31–34 mpg UK is achievable on mixed routes.
Yes. The G6DJ is an interference engine. If the timing belt fails, pistons will contact open valves, causing severe internal damage. This makes strict adherence to the 60,000 km belt replacement interval essential.
Hyundai specifies API CI‑4/SL 10W‑40 mineral or semi-synthetic diesel oil. Full synthetic is acceptable if it meets the same API standard. Change every 10,000 km or 6 months to protect the turbo, timing system, and fuel pump.
Comprehensive technical documentation and regulatory references
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HYUNDAI Official Site
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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.
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