The Kia G6DB is a 2,497 cc, inline‑four naturally aspirated petrol engine produced between 2018 and 2023. It features dual overhead camshafts (DOHC), 16 valves, and Kia's Smartstream technology with Dual CVVT for optimized valve timing. This engine was designed for smooth, linear power delivery in midsize SUVs and sedans, delivering 138 kW (188 PS) and 241 Nm of torque.
Fitted primarily to the third-generation Kia Sorento (MQ4) and the second-generation Kia K5 (DL3), the G6DB engine was engineered for refined highway cruising and responsive everyday driving. Its character prioritizes low vibration and quiet operation, supported by a balance shaft. Emissions compliance was achieved through precise direct injection and exhaust after-treatment, meeting Euro 6d-TEMP standards.
One documented engineering update addressed potential high-pressure fuel pump (HPFP) noise in early production units, as noted in Kia Technical Service Bulletin TSB-19-FL-012. This was linked to initial pump calibration under specific low-temperature, high-altitude conditions. Kia implemented revised ECU software and pump calibration for engines produced after June 2019 to resolve this concern.
Production years 2018–2023 meet Euro 6d-TEMP standards across all applicable markets (VCA UK Type Approval #VCA/KIA/G6DB/2018).
The Kia G6DB is a 2,497 cc inline‑four naturally aspirated petrol engineered for midsize SUVs and sedans (2018-2023). It combines Smartstream G technology with gasoline direct injection (GDI) to deliver smooth, linear power and strong fuel efficiency. Designed to meet Euro 6d-TEMP standards, it balances refined performance with low running costs.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,497 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 88.5 mm × 101.5 mm | |
| Power output | 138 kW (188 PS) @ 6,100 rpm | |
| Torque | 241 Nm @ 4,000 rpm | |
| Fuel system | Gasoline Direct Injection (GDI) | |
| Emissions standard | Euro 6d-TEMP | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | N/A | |
| Timing system | Chain-driven | |
| Oil type | ACEA C2 or API SP (SAE 5W‑30) | |
| Dry weight | 135 kg |
The naturally aspirated design offers predictable, linear power delivery ideal for relaxed driving but lacks the low-end surge of turbocharged rivals. Regular oil changes using the specified 5W-30 low-SAPS oil are critical for maintaining fuel efficiency and protecting the GDI system and catalytic converter. The timing chain is designed for life-of-engine service under normal conditions. Fuel quality meeting EN 228 (EU) or equivalent standards is recommended to prevent injector fouling and maintain emissions compliance. Early production engines (pre-06/2019) may benefit from ECU update per TSB-19-FL-012 if high-pressure fuel pump noise is observed.
Oil Specs: Requires ACEA C2 or API SP (5W-30) low-SAPS oil to protect emissions systems (Kia Owner's Manual).
Emissions: Euro 6d-TEMP certification applies to all 2018-2023 G6DB engines (VCA Type Approval #VCA/KIA/G6DB/2018).
Power Ratings: Measured under ISO 1585 standards. Output is consistent across model applications (Kia TIS Doc. KTS-G6DB-03).
Kia Technical Information System (TIS): Docs KTS-G6DB-01, KTS-G6DB-02, KTS-G6DB-03
Kia Technical Service Bulletin: TSB-19-FL-012
VCA Type Approval Database (VCA/KIA/G6DB/2018)
The Kia G6DB was used across Kia's MQ4 and DL3 platforms with transverse mounting. This engine received platform-specific adaptations-optimized engine mounts for the Sorento SUV-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 flat machined surface on the front of the cylinder block, near the exhaust manifold (Kia TIS KTS-G6DB-01). The 8th digit of the VIN for Sorento MQ4 models is 'G' for the G6DB engine. Visually, it can be identified by its silver plastic intake manifold and coil-on-plug ignition system. Critical differentiation from the turbocharged G4KJ: The G6DB lacks a turbocharger, intercooler, and associated piping. Engine mounts and some ancillary brackets are shared with the Theta II engine family, but the long block and intake/exhaust systems are unique.
The G6DB's primary documented concern is potential high-pressure fuel pump noise in early builds, linked to specific calibration. Kia internal data indicated a very small subset of pre-2019 engines required attention, while UK DVSA records show no systemic emissions or mechanical failure trends. Severe driving cycles and infrequent oil changes can exacerbate carbon buildup, making adherence to the specified 5W-30 oil and service intervals critical.
Analysis derived from Kia technical bulletins (2018-2023) and UK DVSA failure statistics (2020-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about KIA G6DB.
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