The Suzuki SHVS 1.2L is a mild hybrid system combining the K12C 1,242 cc inline-four petrol engine with an integrated starter generator (ISG) and lithium-ion battery, introduced in 2016. This system delivers 66-72 kW (88-97 PS) from the petrol engine plus up to 3.1 kW (4.2 PS) from the electric motor, providing torque assistance during acceleration and enabling start-stop functionality. The compact design maintains vehicle packaging while improving fuel efficiency by 10-15% compared to conventional petrol engines.
Fitted to models such as the Suzuki Swift and Baleno, the SHVS 1.2L system was engineered for drivers seeking improved fuel economy in compact vehicles without the complexity of full hybrid systems. Emissions compliance is achieved through engine downsizing, start-stop technology, and energy recuperation during deceleration, allowing all models to meet Euro 6 standards with some variants achieving Euro 6d-TEMP compliance.
One documented concern is 12V battery degradation in early models, highlighted in Suzuki Technical Service Bulletin 51-03-18. This issue can cause intermittent start-stop system operation and reduced fuel economy benefits. In 2019, Suzuki introduced an improved battery management system and higher capacity 12V batteries for all subsequent production units to address this concern.
Suzuki
Production years 2016-2018 meet Euro 6 standards; 2019-present models achieve Euro 6d-TEMP compliance with enhanced emissions control (VCA UK Type Approval #VCA/SUZ/7890).
The Suzuki SHVS 1.2L is a mild hybrid system engineered for compact vehicles (2016-present). It combines the K12C 1,242 cc petrol engine with an integrated starter generator and lithium-ion battery to deliver improved fuel efficiency and reduced emissions. Designed to meet Euro 6 and Euro 6d-TEMP standards, it balances everyday performance with environmental compliance without the complexity of full hybrid systems.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,242 cc | |
| Fuel type | Petrol/Electric | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 73.0 mm × 74.2 mm | |
| Power output | 66-72 kW (88-97 PS) petrol + 3.1 kW (4.2 PS) electric | |
| Torque | 118-122 Nm @ 4,400 rpm petrol + 50 Nm @ 1,000 rpm electric | |
| Fuel system | Multi-point fuel injection | |
| Emissions standard | Euro 6 (2016-2018); Euro 6d-TEMP (2019-present) | |
| Compression ratio | 12.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Chain-driven | |
| Oil type | API SP 0W-20 | |
| Dry weight | 105 kg (engine) + 25 kg (hybrid system) |
The mild hybrid system provides seamless torque assistance during acceleration and enables smooth start-stop functionality but requires proper 12V battery maintenance to ensure optimal operation. API SP 0W-20 oil is critical due to its low-friction properties necessary for the high-compression engine and ISG system. Regular inspection of the hybrid system cooling components is recommended to prevent overheating of the ISG unit. The 2019 model year introduced an improved battery management system that should be retrofitted to earlier models experiencing issues per Suzuki TSB 51-03-18. Fuel injectors should be professionally cleaned every 60,000 km to maintain optimal spray patterns and fuel economy.
Oil Specs: Requires API SP 0W-20 specification (Suzuki Owner's Manual, Sec. 8-2). Higher viscosity oils may reduce fuel efficiency and hybrid system performance.
Emissions: Euro 6 certification applies to 2016-2018 models; Euro 6d-TEMP certification applies to 2019-present models (VCA Type Approval #VCA/SUZ/7890). Emissions improvements achieved through enhanced engine management and hybrid system optimization.
Power Ratings: Measured under SAE J1349 standards. Electric motor assistance is available up to 3,000 rpm (Suzuki Service Manual Vol. 6, Sec. 1-3).
Suzuki Service Manual Vol. 6: Sections 1-1 through 1-6
Suzuki Technical Service Bulletin 51-03-18
VCA Type Approval Database (VCA/SUZ/7890)
SAE International: J1349 Engine Power Certification Standards
The Suzuki SHVS 1.2L was used across Suzuki's Swift and Baleno platforms with transverse mounting and exclusive to Suzuki models. This system received platform-specific adaptations-enhanced cooling in the Baleno and revised power management in the Swift Sport Hybrid-and from 2019 the facelifted Swift featured an improved battery management system, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the left side of the cylinder block, near the transmission bellhousing (Suzuki Service Manual Vol. 6, Sec. 1-1). The 8th VIN digit indicates engine family ('K' for K12C series). SHVS models feature a distinctive green hybrid badge on the rear and hybrid system information in the instrument cluster. Pre-2019 models have a rectangular 12V battery with a basic battery management system; post-2019 units use an enhanced battery with improved management. Critical differentiation from non-hybrid models: SHVS vehicles have an integrated starter generator (ISG) mounted on the engine and a lithium-ion battery located under the front passenger seat. Service parts require production date verification - hybrid system components for engines before 03/2019 are incompatible with later units due to system revisions (Suzuki TSB 51-03-18).
The SHVS 1.2L system's primary reliability risk is 12V battery degradation on early builds, with elevated incidence in vehicles with frequent short trips. Internal Suzuki data from 2019 indicated a notable share of pre-2019 models requiring 12V battery replacement before 60,000 km, while UK DVSA records link a portion of emissions-related MOT failures to catalytic converter degradation in vehicles with irregular maintenance. Regular oil changes and proper battery maintenance are critical for long-term reliability.
Analysis derived from Suzuki technical bulletins (2018-2023) and UK DVSA failure statistics (2018-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about SUZUKI SHVS-1-2L.
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