Mercedes GLC W254 (2022 – Présent (Géné)

Reliability score : 8.2/10

The Mercedes-Benz GLC second generation (internally designated X254 for the SUV and C254 for the Coupe, though commonly referred to as W254) represents a significant technological leap over its predecessor. Riding on the MRA2 platform shared with the W206 C-Class, it features a fully electrified powertrain lineup—every engine is either a Mild Hybrid (MHEV) with a 48V Integrated Starter-Generator (ISG) or a Plug-in Hybrid (PHEV) with a massive 31.2 kWh battery. Positioned as a premium mid-size luxury SUV, it boasts class-leading aerodynamics (Cd 0.29), an S-Class inspired interior with the MBUX 2.0 system, and exceptional refinement. The controversial shift to exclusively 4-cylinder engines (even for the AMG 63 models, though a 6-cylinder diesel 450 d was later introduced in select markets)

✅ Strengths

Exceptional real-world fuel economy on diesel MHEV models (220 d / 300 d).
Class-leading electric range for PHEV models (often exceeding 100 km / 62 miles in real-world conditions).
Superb ride quality, especially when equipped with the optional AIRMATIC air suspension and rear-axle steering.
State-of-the-art MBUX 2.0 infotainment system with excellent voice recognition.
Outstanding cabin insulation and acoustic comfort (with optional acoustic glass).

⚠️ Weaknesses

Over-reliance on touch-sensitive controls on the steering wheel and center console (distracting while driving).
Significant weight increase across the board; PHEV models weigh over 2.3 tons, affecting agility.
Boot space in PHEV models is severely compromised (470 liters vs 620 liters in MHEV models).
Early production models (2022-2023) plagued by software glitches (blank screens, CarPlay drops, 48V system errors).
Interior build quality inconsistencies: creaking from the piano black center console and door handles under pressure.

🎯 Verdict

The Mercedes-Benz GLC (X254) is a technological tour de force and arguably the most comfortable and refined SUV in its class. For buyers focused on the diesel powertrains, the GLC 220 d and 300 d are the sweet spots of the entire range. The OM654M engine is a masterpiece of efficiency, easily achieving compact-car fuel economy in a heavy luxury SUV. However, this generation's extreme complexity is its Achilles' heel. The integration of the 48V ISG system across all non-PHEV models has led to early software and battery teething issues. If buying a 2023 model, it is absolutely critical to verify that all dealer software updates and recalls (especially the fuel pump and 48V fuse) have been performed. Buying Advice: Highly recommended for the diesel variants (220d/300d) if you drive more than 15,000 km/year, provided you secure a comprehensive warranty to cover potential electronic or MBUX faults. Avoid the PHEV models (300e/300de) unless you strictly need the EV range for daily commuting and can charge at home, as the weight penalty and boot space reduction are severe compromises.