The Vauxhall G9U 754 is a 2,298 cc, inline‑four turbocharged diesel engine produced between 2014 and 2021. It features a DOHC 16‑valve layout, common‑rail direct injection, and a variable geometry turbocharger (VGT), delivering 140 kW (190 PS) and 400 Nm of torque. Exhaust gas recirculation (EGR) and a diesel particulate filter (DPF) enable strong low‑rpm torque for everyday drivability while meeting stringent emissions targets.
Fitted to models such as the Insignia B and Zafira Tourer—including the 2.3 CDTI variants—the G9U 754 was engineered under licence from Renault for performance-oriented applications requiring higher output and towing capacity. Emissions compliance was achieved through a close‑coupled oxidation catalyst, cooled EGR, and a wall‑flow DPF, allowing full Euro 6b compliance from launch.
One documented concern is premature wear of the high-pressure fuel pump (HPFP) drive lobe on the camshaft, highlighted in Vauxhall Service Bulletin 12‑061. This is often linked to extended oil change intervals or use of non‑dexos2‑approved lubricants. In 2017, Vauxhall introduced a revised camshaft surface treatment and updated HPFP calibration to mitigate wear.
Production years 2014–2021 meet Euro 6b standards across all markets (VCA UK Type Approval #VCA/EMS/7891).
The Vauxhall G9U 754 is a 2,298 cc inline‑four turbocharged diesel engineered for mid‑size and MPV models (2014–2021). It combines common‑rail direct injection with a variable geometry turbocharger to deliver robust low‑rpm torque and efficient highway cruising. Designed to meet Euro 6b emissions standards, it balances performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,298 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 85.0 mm × 101.3 mm | |
| Power output | 140 kW (190 PS) @ 3,750 rpm | |
| Torque | 400 Nm @ 1,750–2,750 rpm | |
| Fuel system | Bosch CP4.2 common‑rail (up to 2,000 bar) | |
| Emissions standard | Euro 6b | |
| Compression ratio | 15.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Variable geometry turbo (Garrett GT1749V) | |
| Timing system | Chain (front‑mounted, maintenance‑free design) | |
| Oil type | GM dexos2 (SAE 5W‑30) | |
| Dry weight | 172 kg |
The VGT turbo provides strong low-RPM torque ideal for towing and motorway overtaking but requires strict adherence to 15,000 km or 12-month oil change intervals using GM dexos2 (5W-30) to protect the camshaft HPFP drive lobe and turbo bearing. The Bosch CP4.2 fuel pump demands EN 590-compliant ultra-low-sulfur diesel (ULSD) to prevent premature wear. Short-trip driving may accelerate DPF and EGR clogging. Post-2017 engines include a nitrided camshaft per Vauxhall SIB 12 061 to improve HPFP drive durability.
Oil Specs: Requires GM dexos2 (5W-30) specification (Vauxhall SIB 12 061). Equivalent to ACEA C3 but with GM-specific additive limits.
Emissions: Euro 6b certification applies to all 2014–2021 models (VCA Type Approval #VCA/EMS/7891). No market-specific deviations.
Power Ratings: Measured under SAE J1349 standards. Full 140 kW output requires EN 590 diesel fuel quality (Vauxhall TIS Doc. V60200).
Vauxhall Technical Information System (TIS): Docs V60110, V60115, V60200, SIB 12 061
VCA Type Approval Database (VCA/EMS/7891)
SAE International: J1349 Engine Power Certification Standards
The Vauxhall G9U 754 was used across Vauxhall's Insignia B and Zafira Tourer platforms with transverse mounting under licence from Renault. This engine received platform-specific adaptations—reinforced engine mounts in the Insignia for towing stability and compact exhaust manifolds in the Zafira—and from 2017 the Insignia LCI adopted updated camshaft hardware, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the cylinder block near the timing cover (Vauxhall TIS V60130). The 7th VIN digit indicates engine family ('G' for G9U series). All G9U 754 units feature a black plastic cam cover with '2.3 CDTI' badge. Critical differentiation from G9T 720: G9U 754 has larger displacement (2.3L vs 2.0L), higher torque output, and unique EGR routing. Camshaft part numbers changed in 2017—pre-2017 camshafts (GM 55588430) are not interchangeable with post-2017 units (GM 55588431) due to surface treatment updates (Vauxhall SIB 12 061).
The G9U 754's primary reliability risk is camshaft HPFP drive lobe wear in early builds, with elevated incidence in vehicles using non‑dexos2 oil or extended service intervals. Vauxhall internal data from 2018 indicated a measurable increase in camshaft‑related warranty claims before 90,000 km, while UK DVSA records show no significant DPF‑related MOT failures linked to this engine. Oil quality and change discipline make camshaft longevity critical.
Analysis derived from Vauxhall technical bulletins (2014–2020) and UK DVSA failure statistics (2016–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VAUXHALL G9U-754.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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