The Hyundai G4CP is a 1,975 cc, inline‑four naturally aspirated petrol engine produced between 2005 and 2010. It features dual overhead camshafts (DOHC), 16 valves, and sequential multi‑point fuel injection (SFI). In standard form it delivers 105 kW (143 PS) and 184 Nm of torque, offering smooth, linear power delivery for everyday urban and highway driving.
Fitted to models such as the Sonata (NF), Tucson (JM), and Santa Fe (CM), the G4CP was engineered for reliability, low maintenance costs, and refined operation across varied climates. Emissions compliance was achieved through a three‑way catalytic converter and electronic engine management, meeting Euro 4 standards across all markets.
One documented concern is premature wear of the hydraulic lash adjusters (HLAs), highlighted in Hyundai Service Information Bulletin EM‑2008‑12. This issue stems from extended oil change intervals or use of non‑specified viscosity grades, leading to valve train noise and potential camshaft lobe wear under sustained high‑RPM operation.
All production years 2005–2010 meet Euro 4 emissions standards (VCA UK Type Approval #VCA/EMS/2187).
The Hyundai G4CP is a 1,975 cc inline‑four naturally aspirated petrol engine engineered for mid‑size sedans and SUVs (2005–2010). It combines sequential multi‑point fuel injection with DOHC architecture to deliver smooth, predictable performance. Designed to meet Euro 4 standards universally, it prioritizes serviceability and long-term durability over peak output.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,975 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 86.0 mm × 85.0 mm | |
| Power output | 105 kW (143 PS) | |
| Torque | 184 Nm @ 4,500 rpm | |
| Fuel system | Sequential multi‑point injection (SFI) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain (front‑mounted) | |
| Oil type | Hyundai SP 10W‑40 (API SL/SM) | |
| Dry weight | 138 kg |
The G4CP delivers predictable, linear power ideal for daily commuting and light towing but requires strict adherence to 10,000 km oil change intervals using Hyundai SP 10W-40 to protect hydraulic lash adjusters and camshaft lobes. Extended intervals or incorrect viscosity accelerate HLA wear, leading to ticking noises and potential cam damage. The front-mounted timing chain is generally durable but should be inspected at 150,000 km. No turbo or direct injection simplifies maintenance, though carbon buildup on intake valves may occur after 120,000 km in stop-start urban use.
Oil Specs: Requires Hyundai SP 10W-40 (API SL/SM) specification (Hyundai SIB EM‑2008‑12). Not interchangeable with 5W-30 or ACEA diesel oils.
Emissions: Euro 4 certification applies to all 2005–2010 models (VCA Type Approval #VCA/EMS/2187). No market exceptions.
Power Ratings: Measured under SAE J1349 standards. Output consistent across global markets due to Euro 4 homologation (Hyundai TIS EM‑G4CP‑01).
Hyundai Technical Information System (TIS): Docs EM‑G4CP‑01 to EM‑G4CP‑04, SIB EM‑2008‑12
VCA Type Approval Database (VCA/EMS/2187)
SAE International: J1349 Engine Power Certification Standards
The Hyundai G4CP was used across Hyundai's NF/JM/CM platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Sonata NF for NVH refinement and reinforced subframes in the Tucson JM for off-road durability—and from 2007 minor ECU calibration updates were introduced to improve cold-start emissions per SIB EM‑2008‑12, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front timing cover near the crankshaft pulley (Hyundai TIS EM‑G4CP‑05). The 7th VIN digit is 'G' for G4CP-equipped vehicles. All G4CP engines feature a silver aluminum valve cover with '2.0' embossed branding and a single three-way catalytic converter. Critical differentiation from Theta G4KD: G4CP uses Mitsubishi-derived architecture with distributorless ignition coils mounted directly on spark plugs; G4KD uses Hyundai Theta DOHC with different bore/stroke. Oil pan shape and mounting bolt pattern are unique to G4CP.
The G4CP's primary reliability risk is hydraulic lash adjuster (HLA) wear due to improper oil maintenance, with elevated incidence in high-mileage or neglected vehicles. Hyundai internal data from 2008 indicated a measurable uptick in valve train noise complaints after 100,000 km when non-specified oils were used, while UK DVSA records show minimal emissions-related MOT failures due to robust catalytic converter design. Infrequent oil changes and hot-climate operation accelerate wear, making fluid specification and interval adherence critical.
Analysis derived from Hyundai technical bulletins (2007–2010) and UK DVSA failure statistics (2010–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about HYUNDAI G4CP.
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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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