The Mercedes-Benz GLA 45 S (H247) represents the high-performance variant of the second-generation GLA compact SUV, produced from February 2020 through 2023. Positioned as the flagship model within the GLA lineup, the 45 S distinguishes itself through its potent engine, advanced drivetrain, and track-focused enhancements. It’s a key offering in the burgeoning market for high-performance luxury crossovers, competing with vehicles like the BMW X2 M35i and Audi SQ2. The H247 GLA generation, built on the MFA2 platform, aimed to offer a more spacious and refined experience compared to its predecessor.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | GLA |
| Generation | GLA (H247) |
| Type | AMG GLA 45 S (421 Hp) 4MATIC+ DCT |
| Start of production | February, 2020 |
| End of production | 2023 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (combined NEDC) | 9.2-9.3 l/100 km (25.6 – 25.3 US mpg, 30.7 – 30.4 UK mpg, 10.9 – 10.8 km/l) |
| CO2 emissions (NEDC) | 210-212 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.3 sec |
| Acceleration 0 – 62 mph | 4.3 sec |
| Acceleration 0 – 60 mph | 4.1 sec |
| Maximum speed | 270 km/h (167.77 mph) |
| Power | 421 Hp @ 6750 rpm |
| Power per litre | 211.5 Hp/l |
| Torque | 500 Nm @ 5000-5250 rpm (368.78 lb.-ft. @ 5000-5250 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 139 |
| Engine displacement | 1991 cm3 (121.5 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Turbocharger, Intercooler |
| Wheelbase | 2729 mm (107.44 in.) |
| Drivetrain Architecture | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission AMG SPEEDSHIFT DCT |
| Front suspension | Independent type McPherson |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs, 360 mm |
| Rear brakes | Ventilated discs, 330 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Wheel rims size | 20 |
Powertrain & Engine Architecture
The heart of the GLA 45 S is the M139 2.0-liter turbocharged inline-four engine. This engine is notable for its unique design, featuring the turbocharger and exhaust manifold switched to the front of the engine, reducing exhaust gas routing length and improving responsiveness. The M139 utilizes direct fuel injection and a sophisticated twin-scroll turbocharger. The engine produces 421 horsepower at 6,750 rpm and 368.78 lb-ft of torque between 5,000 and 5,250 rpm. This output is achieved through a combination of increased boost pressure and optimized engine mapping compared to the standard GLA 45. The engine also incorporates features like plasma-sprayed cylinder linings (NANOSLIDE) to reduce friction. Power is transmitted to all four wheels via an 8-speed AMG SPEEDSHIFT DCT dual-clutch transmission, known for its rapid gear changes and adaptive shifting logic. The transmission features selectable drive modes, including a Race Start function.
Driving Characteristics
The GLA 45 S delivers exceptionally quick acceleration, achieving 0-60 mph in approximately 4.1 seconds. The dual-clutch transmission provides near-instantaneous shifts, contributing to the car’s dynamic performance. Compared to the standard GLA 45, the ‘S’ variant offers a more aggressive throttle response and a heightened sense of urgency. The 4MATIC+ all-wheel-drive system is rear-biased, allowing for a more engaging driving experience and enabling controlled drifts. The suspension is tuned for performance, offering a firm ride but maintaining a reasonable level of comfort for daily driving. The steering is precise and well-weighted, providing good feedback to the driver. While the performance is impressive, the firm suspension and powerful engine can make the GLA 45 S less forgiving than other GLA variants.
Equipment & Trim Levels
The GLA 45 S came standard with a comprehensive suite of features, including AMG-specific styling elements, such as a unique front grille, aggressive body kit, and quad exhaust outlets. The interior featured sport seats upholstered in Artico leather and Dinamica microfiber, along with AMG-branded steering wheel and pedals. Standard technology included a dual 10.25-inch display screen for the instrument cluster and infotainment system, Mercedes-Benz User Experience (MBUX) voice control, and a premium Burmester sound system. Optional extras included a panoramic sunroof, head-up display, and advanced driver-assistance systems like adaptive cruise control and lane-keeping assist. Interior color options were limited to darker shades, emphasizing the car’s sporty character.
Chassis & Braking
The GLA 45 S features a reinforced chassis and upgraded suspension components compared to other GLA models. The front suspension utilizes McPherson struts, while the rear employs a multi-link setup. The brakes are significantly upgraded, featuring large ventilated discs (360mm front, 330mm rear) with multi-piston calipers. This provides exceptional stopping power and resistance to fade during spirited driving. The car also benefits from an electromechanical power steering system with variable assist. The 4MATIC+ all-wheel-drive system can seamlessly distribute torque between the front and rear axles, optimizing traction in various conditions.
Market Reception & Comparison
The GLA 45 S was generally well-received by automotive critics, who praised its performance, handling, and technology. However, some reviewers noted the firm ride quality and relatively high price tag. Compared to the standard GLA 45, the ‘S’ variant offered a substantial performance upgrade, justifying the price premium for enthusiasts. Against competitors like the BMW X2 M35i, the GLA 45 S often emerged as the quicker and more powerful option, but the BMW offered a slightly more comfortable ride. Fuel economy, at around 25 mpg combined, was typical for a high-performance SUV of this class. Reliability reports have been mixed, with some owners reporting minor issues with the infotainment system and occasional turbocharger concerns.
Legacy
The GLA 45 S represents a significant achievement in compact SUV performance. The M139 engine has proven to be a robust and capable powerplant, and the AMG SPEEDSHIFT DCT transmission delivers exceptional responsiveness. On the used car market, the GLA 45 S holds its value relatively well, due to its performance credentials and exclusivity. However, potential buyers should be aware of the higher maintenance costs associated with a high-performance vehicle. The GLA 45 S has cemented its place as a desirable option for drivers seeking a thrilling and engaging driving experience in a practical and stylish package. Its influence can be seen in the continued development of high-performance compact SUVs from various manufacturers.
