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/Va…
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 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.
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.
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The G9T 645 is generally robust for commercial use when maintained correctly. Its main weakness is the high-pressure fuel pump, sensitive to poor fuel quality. Strict adherence to service intervals, using RN0720 oil and premium diesel, significantly improves long-term reliability and prevents costly failures.
The most frequent issues are failures of the Denso HP4 high-pressure fuel pump, clogging of the EGR valve and cooler, electronic turbocharger actuator faults, and DPF regeneration problems. These are well-documented in Renault service bulletins and relate to the engine's emissions systems.
The G9T 645 was used in the Renault Master III (Phase 2, 2015-2021), specifically in the dCi 150 and dCi 170 variants. It was also fitted to the badge-engineered Nissan NV400 and Opel/Vauxhall Movano B models from the same period.
Yes, ECU remapping is common and can yield significant power and torque gains. However, pushing the engine beyond its 190 PS/400 Nm significantly increases stress on the turbo, clutch, and fuel system, potentially leading to premature failure if supporting modifications are not made.
Fuel economy varies greatly by vehicle weight and usage. In a Renault Master panel van, expect 28-35 mpg (UK) (8.1-6.7 L/100km) combined. Fuel efficiency drops significantly under heavy load or with frequent stop-start driving, which also impacts DPF health.
Yes. The G9T 645 is an interference engine. If the timing chain were to fail or jump, the pistons would collide with the open valves, causing catastrophic internal engine damage. Fortunately, the chain is generally very durable with proper oil maintenance.
Renault mandates the use of RN0720 specification oil, typically a 5W-30 synthetic. This low-SAPS (Sulphated Ash, Phosphorus, Sulphur) oil is critical for protecting the DPF and turbocharger. Using the wrong oil can lead to DPF blockage and turbo failure.
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RENAULT 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
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