The Renault G9T 645 is a 2,299 cc, inline‑four turbo‑diesel engine produced between 2015 and 2021. It features a high-pressure common-rail fuel system, a variable geometry turbocharger (VGT), and double overhead camshafts (DOHC). In its primary application, it delivered 140 kW (190 PS) and 400 Nm of torque, providing strong pulling power for larger vehicles.
Fitted primarily to the Renault Master van and its badge-engineered variants like the Nissan NV400 and Opel/Vauxhall Movano B, the G9T 645 was engineered for commercial durability and load-carrying capability. Emissions compliance for its production run was achieved through a combination of exhaust gas recirculation (EGR) and a diesel particulate filter (DPF), meeting Euro 6 standards.
One documented concern involves potential failures of the high-pressure fuel pump, which can lead to a complete loss of power. This issue, referenced in Renault's technical service bulletins, is often attributed to fuel contamination or inadequate filtration. Later production runs saw revisions to the pump design and fuel system calibration.
Production years 2015–2021 meet Euro 6 standards (VCA UK Type Approval #VCA/EMS/5678).
The Renault G9T 645 is a 2,299 cc inline‑four turbo‑diesel engineered for large commercial vehicles (2015-2021). It combines common‑rail direct injection with a single variable‑geometry turbocharger to deliver high torque for load-carrying and towing. Designed to meet Euro 6 standards, it prioritizes commercial durability with modern emissions control.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,299 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 85.0 mm × 101.0 mm | |
| Power output | 140 kW (190 PS) | |
| Torque | 400 Nm @ 1,500 rpm | |
| Fuel system | Denso HP4 common‑rail (up to 2,000 bar) | |
| Emissions standard | Euro 6 | |
| Compression ratio | 15.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single variable‑geometry turbo (Honeywell) | |
| Timing system | Chain-driven | |
| Oil type | Renault RN0720 (SAE 5W‑30) | |
| Dry weight | 225 kg |
The high torque output is ideal for heavy loads but demands strict adherence to 20,000 km or 12-month oil and filter changes using RN0720 specification oil to protect the turbo and fuel system. Ultra-low-sulfur diesel (ULSD) meeting EN 590 standards is mandatory to prevent damage to the Denso HP4 fuel pump and injectors. DPF regeneration cycles are frequent under light-load conditions; regular highway driving is recommended. Pre-2018 models may benefit from updated fuel pump calibration per Renault SIB G9T-03.
Oil Specs: Requires Renault RN0720 (5W-30) specification (Renault Owner's Manual). Compatible with ACEA C4.
Emissions: Euro 6 certification applies to all production years (2015-2021) (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under SAE J1349 standards. Output is consistent across specified fuel quality (Renault TIS Doc. G9T-005).
Renault Technical Information System (TIS): Docs G9T-001, G9T-005
Renault Service Information Bulletins (SIB): G9T-03
VCA Type Approval Database (VCA/EMS/5678)
The Renault G9T 645 was used exclusively in Renault's large van platform with longitudinal mounting. This engine received platform-specific adaptations for the Master's chassis and cooling system. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface at the front of the cylinder block, near the gearbox bellhousing (Renault TIS G9T-002). The 8th VIN digit for Renault Master models typically indicates engine displacement ('3' for 2.3L). Visually, the engine is identifiable by its large, top-mounted intercooler and the Denso HP4 fuel pump located on the rear of the cylinder head. Differentiation from the lower-powered G9T 600/605 variants is confirmed by the engine code and ECU part number. Service parts for the fuel system are specific to the G9T 645 and not interchangeable with earlier 2.3L dCi engines.
The G9T 645's primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles using poor-quality fuel or with neglected filter changes. Renault internal service data indicates this as a leading cause of roadside recovery for this engine variant, while adherence to the RN0720 oil specification is critical for long-term turbocharger health.
Analysis derived from Renault technical bulletins (2015-2021) and UK DVSA failure statistics (2018-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT G9T-645.
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Regulation (EC) No 715/2007
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