The Vauxhall G9U 632 is a 2,148 cc, inline‑four turbocharged diesel engine produced between 2011 and 2019 under licence from Renault. It features common-rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). In standard form it delivers 103 kW (140 PS) and 320 Nm of torque, offering strong low-end pull and relaxed motorway cruising.
Fitted to mid-size models such as the Insignia A, Insignia B, and Zafira Tourer—including the Insignia 2.0 CDTI 140 and Zafira 2.0 CDTI—the G9U 632 was engineered for drivers seeking a balance of performance, refinement, and fuel economy. Emissions compliance was achieved through exhaust gas recirculation (EGR), a diesel oxidation catalyst (DOC), and a diesel particulate filter (DPF), meeting Euro 5b and Euro 6 standards depending on model year.
One documented concern is premature failure of the high-pressure fuel pump drive due to inadequate lubrication from ultra-low-sulfur diesel, which can cause sudden loss of rail pressure. This issue, highlighted in Vauxhall Service Bulletin TIS‑G9U‑11, is attributed to coupling fatigue in early pump designs. From 2015, revised pump components with improved metallurgy were introduced to enhance durability.
Production years 2011–2014 meet Euro 5b standards; 2015–2019 models meet Euro 6 (VCA UK Type Approval #VCA/EMS/7890).
The Vauxhall G9U 632 is a 2,148 cc inline‑four turbocharged diesel engineered for mid-size sedans, estates, and MPVs (2011–2019). It combines Bosch common-rail injection with a single variable-geometry turbocharger to deliver responsive low-RPM torque and efficient highway cruising. Designed to meet Euro 5b and Euro 6 emissions standards, it balances performance with urban compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,148 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged (VGT) | |
| Bore × stroke | 84.0 mm × 97.0 mm | |
| Power output | 103 kW (140 PS) | |
| Torque | 320 Nm @ 1,750–2,500 rpm | |
| Fuel system | Bosch CP4.2 common-rail (up to 1,800 bar) | |
| Emissions standard | Euro 5b (2011–2014); Euro 6 (2015–2019) | |
| Compression ratio | 15.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single variable-geometry turbo (Garrett) | |
| Timing system | Chain (front‑mounted; low‑wear design) | |
| Oil type | GM dexos2 (SAE 5W‑30) | |
| Dry weight | 165 kg |
The VGT turbo provides strong low-RPM torque ideal for motorway overtaking but requires strict adherence to 15,000 km oil change intervals using GM dexos2 (5W-30) to protect turbo bearings and timing chain. The Bosch CP4.2 high-pressure fuel pump is highly sensitive to fuel lubricity—only EN 590 ultra-low-sulfur diesel should be used. Early G9U 632 units (2011–2014) are prone to fuel pump drive failure due to coupling fatigue, as documented in SIB TIS‑G9U‑11; post-2015 engines include an updated coupling. DPF regeneration cycles must complete uninterrupted to avoid clogging, and EGR cooler fouling is common in short-trip use.
Oil Specs: Requires GM dexos2 (5W-30) specification (Vauxhall Owner’s Manual 2012). Meets ACEA C3 but with GM-specific additives for turbo and emissions system protection.
Emissions: Euro 5b applies to 2011–2014 builds; Euro 6 certification applies to 2015–2019 models (VCA Type Approval #VCA/EMS/7890).
Power Ratings: Measured under SAE J1349 standards. Output consistent across all markets (Vauxhall TIS Doc. TG9U‑C).
Vauxhall Technical Information System (TIS): Docs TG9U‑A, TG9U‑B, SIB TIS‑G9U‑11
VCA Type Approval Database (VCA/EMS/7890)
SAE International: J1349 Engine Power Certification Standards
The Vauxhall G9U 632 was used across Vauxhall's Insignia A, Insignia B, and Zafira Tourer platforms with transverse mounting under licence from Renault. This engine received platform-specific adaptations—revised engine mounts in the Insignia B for NVH control and unique exhaust manifolds in the Zafira—and from 2015 the addition of a selective catalytic reduction (SCR) system on Euro 6 variants, creating minor ECU and exhaust differences. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front timing cover near the oil filler neck (Vauxhall TIS TG9U‑A). The 7th VIN digit is 'G' for 2.0L diesel engines. Pre-2015 units lack SCR and use ECU part number 13580122; post-2015 Euro 6 variants use ECU 13580138 with AdBlue control. Critical differentiation from G9U 650: G9U 632 produces 140 PS, while G9U 650 produces 170 PS and uses a larger turbocharger. Service parts for exhaust and ECU are not interchangeable across SCR boundaries (Vauxhall SIB TIS‑G9U‑12).
The G9U 632's primary reliability risk is high-pressure fuel pump coupling failure, with elevated incidence in pre-2015 builds subjected to frequent short trips or poor-quality diesel. Vauxhall internal data (2016) indicated a notable failure rate in early production engines before 120,000 km, while UK DVSA MOT records show increased DPF-related failures in high-mileage examples. Extended oil intervals and low-lubricity fuel accelerate wear in the CP4.2 system, making fuel quality and maintenance critical.
Analysis derived from Vauxhall technical bulletins (2012–2019) and UK DVSA failure statistics (2016–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VAUXHALL G9U-632.
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