The Chevrolet Sonic I Sedan (facelift 2016) 1.8L, producing 138 horsepower with an automatic transmission, represented a key offering in Chevrolet’s subcompact car lineup from 2016 to 2018. Positioned as a mid-range trim, it aimed to balance affordability with a more refined driving experience than the base 1.4L turbo model. This variant was primarily marketed towards North American consumers seeking a fuel-efficient, practical, and relatively well-equipped small car. It sat within the first generation of the Sonic (launched in 2011), which was a rebadged and significantly revised version of the global Chevrolet Aveo/Cruze platform, specifically the Gamma II architecture. The 2016 facelift brought updated styling and minor interior enhancements.
Technical Specifications
| Brand | Chevrolet |
| Model | Sonic |
| Generation | Sonic I Sedan (facelift 2016) |
| Type (Engine) | 1.8 (138 Hp) Automatic |
| Start of production | 2016 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 9.4 l/100 km (25 US mpg) |
| Fuel consumption (extra urban) | 6.9 l/100 km (34.1 US mpg) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 9.3 kg/Hp |
| Weight-to-torque ratio | 7.6 kg/Nm |
| Power | 138 Hp @ 6300 rpm |
| Power per litre | 76.8 Hp/l |
| Torque | 170 Nm @ 3800 rpm (125.39 lb.-ft. @ 3800 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | LUW, LWE |
| Engine displacement | 1796 cm3 (109.6 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 80.5 mm (3.17 in.) |
| Piston Stroke | 88.2 mm (3.47 in.) |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 4.5 l (4.76 US qt | 3.96 UK qt) |
| Coolant capacity | 6 l (6.34 US qt | 5.28 UK qt) |
| Kerb Weight | 1287 kg (2837.35 lbs.) |
| Trunk (boot) space | 422 l (14.9 cu. ft.) |
| Fuel tank capacity | 46 l (12.15 US gal | 10.12 UK gal) |
| Length | 4416 mm (173.86 in.) |
| Width | 1735 mm (68.31 in.) |
| Height | 1516 mm (59.69 in.) |
| Wheelbase | 2525 mm (99.41 in.) |
| Front track | 1509 mm (59.41 in.) |
| Rear track | 1509 mm (59.41 in.) |
| Drag coefficient (Cd) | 0.33 |
| Minimum turning circle | 10.5 m (34.45 ft.) |
| Drivetrain Architecture | Front wheel drive |
| Number of gears | 6 |
| Gearbox type | Automatic transmission |
| Front suspension | Independent, McPherson with coil spring and anti-roll bar |
| Rear suspension | Semi-independent, coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Drum |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric |
| Tires size | 195/65 R15; 205/50 R16 |
| Wheel rims size | 15; 16 |
Powertrain & Engine Architecture
The 1.8-liter inline-four engine, designated LUW or LWE depending on specific calibration, was a naturally aspirated unit. It featured a dual overhead camshaft (DOHC) valvetrain operating four valves per cylinder. Fuel delivery was handled by a multi-port fuel injection system, a relatively conventional setup for its time. This engine was not known for cutting-edge technology, but rather for its simplicity and reliability. The 6-speed automatic transmission was a crucial component of this variant, offering smoother shifts compared to the available manual transmission, albeit at the expense of some performance. The transmission was tuned for fuel efficiency and comfortable cruising, with gear ratios optimized for everyday driving conditions.
Driving Characteristics
The 138 horsepower and 170 Nm (125 lb-ft) of torque provided by the 1.8L engine and automatic transmission resulted in adequate, but not exhilarating, performance. Acceleration from 0 to 60 mph was estimated to be around 9-10 seconds. The automatic transmission, while smooth, did contribute to a slight reduction in responsiveness compared to the manual transmission equipped Sonic. The gear ratios were spaced to prioritize fuel economy, meaning the engine often felt strained during quick overtaking maneuvers. However, for typical commuting and highway driving, the powertrain proved perfectly serviceable. The automatic transmission’s shift points were programmed to keep the engine within its optimal torque band, providing a reasonably comfortable driving experience.
Equipment & Trim Levels
The 1.8L Automatic Sonic typically came standard with features such as air conditioning, power windows and locks, a basic audio system with USB connectivity, and Chevrolet’s MyLink infotainment system with a 7-inch touchscreen. Higher trim levels, such as the LT, added features like cruise control, upgraded interior materials, and alloy wheels. Optional extras included a sunroof, a premium audio system, and rear parking sensors. Interior upholstery was typically cloth, with the option of leatherette on higher trims. The dashboard layout was functional and straightforward, prioritizing ease of use over aesthetic flair.
Chassis & Braking
The Sonic utilized a McPherson strut front suspension and a semi-independent coil spring rear suspension. This setup provided a reasonable balance between ride comfort and handling. Front brakes were ventilated discs, offering adequate stopping power, while rear brakes were drums, a cost-saving measure common in this segment. The steering was electrically assisted, providing light and easy steering feel. Stabilizer bars were included at both the front and rear to reduce body roll during cornering. The relatively lightweight construction of the Sonic helped to mitigate the effects of the less powerful engine and the automatic transmission.
Market Reception & Comparison
Critics generally viewed the 1.8L Automatic Sonic as a competent, if unremarkable, subcompact car. It was praised for its fuel efficiency and comfortable ride, but criticized for its lack of power and somewhat uninspired interior. Compared to the 1.4L turbo model, the 1.8L offered smoother power delivery and potentially greater long-term reliability due to its simpler engine design. However, the 1.4L turbo provided significantly more spirited performance. Against competitors like the Honda Fit and Ford Fiesta, the Sonic offered a competitive price point but often lagged behind in terms of driving dynamics and overall refinement. Fuel economy figures were generally in line with other vehicles in its class.
Legacy
The Chevrolet Sonic was discontinued in North America in 2020. The 1.8L automatic powertrain, while not particularly groundbreaking, proved to be relatively reliable in service. Common issues reported by owners included minor electrical glitches and occasional transmission hiccups. However, major mechanical failures were relatively rare. On the used car market, the 1.8L Automatic Sonic represents an affordable and practical option for buyers seeking a fuel-efficient and easy-to-maintain subcompact car. Its simplicity and relatively low maintenance costs make it an attractive choice for budget-conscious consumers. While it may not offer the excitement of some of its rivals, it remains a dependable and functional vehicle.
