The Mercedes-Benz GLC 400e (C254) is a plug-in hybrid variant of the GLC Coupe, introduced in July 2023. Positioned as a mid-to-premium offering within the C254 GLC Coupe range, it combines a 2.0-liter turbocharged gasoline engine with an electric motor, delivering a combined system output of 381 horsepower. This model represents Mercedes-Benz’s commitment to electrification and offers a balance between performance, efficiency, and luxury in a coupe-SUV body style. It builds upon the foundation of the broader GLC platform (X254/C254), sharing its underpinnings with other GLC models but differentiating itself through its hybrid powertrain and associated technology.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | GLC |
| Generation | GLC Coupe (C254) |
| Type | GLC 400e (381 Hp) Plug-in Hybrid 4MATIC 9G-TRONIC |
| Start of production | July, 2023 |
| Powertrain Architecture | PHEV (Plug-in Hybrid Electric Vehicle) |
| Body type | Coupe, SUV |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 0.5-0.6 l/100 km (470.4 – 392 US mpg, 565 – 470.8 UK mpg, 200 – 166.7 km/l) |
| CO2 emissions (WLTP) | 11-15 g/km |
| Fuel Type | Petrol / electricity |
| Acceleration 0 – 100 km/h | 5.6 sec |
| Acceleration 0 – 62 mph | 5.6 sec |
| Acceleration 0 – 60 mph | 5.3 sec |
| Maximum speed | 239 km/h (148.51 mph) |
| Emission standard | Euro 6d-ISC-FCM |
| Weight-to-power ratio | 6.1 kg/Hp, 164.9 Hp/tonne |
| Weight-to-torque ratio | 3.6 kg/Nm, 281.4 Nm/tonne |
| Gross battery capacity | 31.2 kWh |
| Battery technology | Lithium-ion (Li-Ion) |
| Battery location | Inside the trunk |
| All-electric range (WLTP) | 119-131 km (73.94 – 81.4 mi) |
| Average Energy consumption (WLTP) | 20.2-22.4 kWh/100 km (32.51 – 36.05 kWh/100 mi, 104 – 93 MPGe, 5 – 4.5 km/kWh, 3.1 – 2.8 mi/kWh) |
| Max speed (electric) | 140 km/h (86.99 mph) |
| Electric motor power | 136 Hp |
| Electric motor Torque | 440 Nm (324.53 lb.-ft.) |
| Electric motor location | Between the combustion engine and the transmission |
| Electric motor type | Synchronous |
| System power | 381 Hp |
| System torque | 650 Nm (479.42 lb.-ft.) |
| Power | 252 Hp @ 5800 rpm (126.1 Hp/l) |
| Torque | 400 Nm @ 2000-3200 rpm (295.02 lb.-ft. @ 2000-3200 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 254 |
| Engine displacement | 1999 cm3 (121.99 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-scroll turbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 6 l (6.34 US qt | 5.28 UK qt) |
| Kerb Weight | 2310 kg (5092.68 lbs.) |
| Max. weight | 2830 kg (6239.08 lbs.) |
| Max load | 520 kg (1146.4 lbs.) |
| Trunk (boot) space – minimum | 390 l (13.77 cu. ft.) |
| Trunk (boot) space – maximum | 1335 l (47.15 cu. ft.) |
| Fuel tank capacity | 49 l (12.94 US gal | 10.78 UK gal) |
| Permitted trailer load with brakes (12%) | 2000 kg (4409.25 lbs.) |
| Permitted towbar download | 100 kg (220.46 lbs.) |
| Length | 4769 mm (187.76 in.) |
| Width | 1920 mm (75.59 in.) |
| Width including mirrors | 2076 mm (81.73 in.) |
| Height | 1606 mm (63.23 in.) |
| Wheelbase | 2888 mm (113.7 in.) |
| Front track | 1628 mm (64.09 in.) |
| Rear (Back) track | 1642 mm (64.65 in.) |
| Front overhang | 848 mm (33.39 in.) |
| Rear overhang | 1033 mm (40.67 in.) |
| Ride height (ground clearance) | 158 mm (6.22 in.) |
| Minimum turning circle (turning diameter) | 10.9 m (35.76 ft.) |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Number of gears and type of gearbox | 9 gears, automatic transmission G-TRONIC |
Powertrain & Engine Architecture
The GLC 400e utilizes a sophisticated plug-in hybrid powertrain. At its core is the M 254 2.0-liter inline-four cylinder gasoline engine, featuring direct injection and a twin-scroll turbocharger. This engine produces 252 horsepower and 295 lb-ft of torque. Integrated with this is a 136 horsepower electric motor, delivering an additional 324 lb-ft of torque. The electric motor is positioned between the engine and the 9G-TRONIC nine-speed automatic transmission. The combined system output is a substantial 381 horsepower and 479 lb-ft of torque. The 31.2 kWh lithium-ion battery pack, located under the trunk floor, provides an all-electric range of 73.94 to 81.4 miles (WLTP cycle). The 9G-TRONIC transmission is specifically calibrated for hybrid operation, optimizing efficiency and smooth transitions between electric and gasoline power.
Driving Characteristics
The GLC 400e offers a refined and responsive driving experience. In electric mode, it provides near-silent acceleration and sufficient power for everyday driving. Switching to hybrid mode seamlessly blends the power of the gasoline engine and electric motor, resulting in brisk acceleration – 0 to 60 mph in approximately 5.3 seconds. The 9G-TRONIC transmission contributes to smooth gear changes and efficient power delivery. Compared to the standard GLC 300, the 400e offers significantly more power and torque, resulting in noticeably quicker acceleration. While the added weight of the battery pack slightly impacts handling agility compared to non-hybrid models, the 4MATIC all-wheel-drive system provides excellent traction and stability. The gear ratios are tuned for a balance between fuel efficiency and performance, prioritizing electric operation at lower speeds and utilizing the gasoline engine for higher-speed cruising and acceleration.
Equipment & Trim Levels
The GLC 400e typically comes well-equipped with standard features including Mercedes-Benz User Experience (MBUX) infotainment system, a large touchscreen display, premium upholstery (often MB-Tex or leather), heated front seats, and a comprehensive suite of safety features like automatic emergency braking, lane keeping assist, and adaptive cruise control. Optional extras include a panoramic sunroof, upgraded audio system, head-up display, and various driver assistance packages. Trim levels beyond the base 400e often add cosmetic enhancements like different wheel designs, exterior trim options, and interior accent packages. The interior design emphasizes luxury and technology, with high-quality materials and a modern aesthetic.
Chassis & Braking
The GLC 400e utilizes a sophisticated chassis design featuring a four-wheel independent suspension. The front suspension employs a three-link design, while the rear utilizes a multi-link setup. Ventilated disc brakes are standard on all four wheels, providing ample stopping power. The braking system is integrated with the hybrid powertrain to enable regenerative braking, which captures energy during deceleration and recharges the battery. The 4MATIC all-wheel-drive system provides a rear-biased torque distribution for enhanced driving dynamics. The suspension is tuned to balance comfort and handling, offering a smooth ride while maintaining good body control.
Market Reception & Comparison
The GLC 400e has been generally well-received by automotive critics, praised for its blend of performance, efficiency, and luxury. Its all-electric range is competitive within the plug-in hybrid SUV segment. Compared to other GLC variants, the 400e offers superior acceleration and lower running costs due to its electric capability. However, it comes at a higher price point. Fuel economy is exceptional when utilizing the electric drive, and even in hybrid mode, it delivers impressive MPG figures. Reliability has been generally good, although the complexity of the hybrid system may require specialized maintenance.
Legacy
The GLC 400e represents a significant step in Mercedes-Benz’s electrification strategy. The powertrain, while complex, has proven to be relatively reliable in early model years. On the used car market, the GLC 400e holds its value well due to its desirable combination of features and fuel efficiency. As battery technology continues to improve, the GLC 400e serves as a bridge between traditional internal combustion engines and fully electric vehicles, offering a practical and appealing option for buyers seeking a more sustainable driving experience.
