Mercedes GLC W254 (2022 – Présent (Géné)

Reliability score : 8.2/10

The second-generation Mercedes-Benz GLC (X254) is based on the MRA2 platform, shared with the C-Class (W206). Launched in late 2022 (2023 model year), it marks a gentle stylistic evolution but a technological and mechanical revolution. All engines are now electrified, ranging from 48V mild-hybrid (MHEV) to plug-in hybrid (PHEV) equipped with a huge 31.2 kWh battery offering over 100 km of electric range. Although demand for gasoline and PHEV is increasing, diesel remains a major pillar for this model, particularly in Europe for high-mileage drivers. The OM 654 M (M for Modified) block has been reworked (displacement increased to 1993 cc, increased injection pressure) and coupled with a second-generation integrated starter-generator (ISG) housed in the 9G-TRONIC gearbox. The GLC X254 positi

✅ Strengths

Exceptionally fuel-efficient and powerful OM 654 M diesel engine
Electric range of PHEV versions (often > 100 real km)
Suspension comfort (especially with the AIRMATIC air suspension option)
Onboard technology (MBUX 2.0, Digital Light headlights)
Optional rear-wheel steering offering formidable maneuverability
PHEV battery integration without a 'step' in the trunk (unlike the W253)

⚠️ Weaknesses

Significantly increased weight (PHEV versions easily exceed 2.3 tons)
Prohibitive purchase price and option costs
Steering wheel ergonomics with imprecise capacitive (haptic) buttons
Reduced trunk volume on PHEV versions (470L vs 620L for thermal models)
Early electronic bugs (MBUX, driving aids)

🎯 Verdict

The Mercedes GLC (X254) is a concentrate of technology that dominates its segment in terms of comfort and energy efficiency. For high-mileage drivers, the 220 d or 300 d diesel (OM 654 M) is the absolute preferred choice. It offers reassuring mechanical reliability, negligible consumption for its size, and high-level driving pleasure thanks to mild hybridization. PHEV versions (including the unique 300 de diesel) are impressive on paper, but their technical complexity and massive overweight encourage caution for a long-term purchase (out of warranty). If you buy a 2023 model, ensure that all recalls (especially electrical and fuel pump) have been carried out and that the MBUX system is up to date to avoid early production electronic inconveniences.

Common issues

Bugs logiciels du système MBUX (infotainment, connectivité) Low

🔧 Dès la livraison – 25 000 km

💶 0 € (généralement sous garantie, mise à jour)

Vérifier les mises à jour logicielles régulières.

Dysfonctionnements du système AdBlue/SCR (capteurs, voyants) Medium

🔧 20 000 – 70 000 km

💶 300 – 800 €

Utiliser AdBlue de qualité et éviter de rouler réservoir vide.

Rappels constructeur (logiciel moteur, composants 48V, sécurité) Medium

🔧 Dès la livraison – 30 000 km

💶 0 € (pris en charge par le constructeur)

S'assurer que tous les rappels ont été effectués.

Défaillance précoce de certains capteurs (ADAS, stationnement) Low

🔧 10 000 – 40 000 km

💶 200 – 600 €

Tester le bon fonctionnement des aides à la conduite.

Estimated maintenance costs

Oil change	250 – 400 £GBP
Complete brakes	900 – 1 600 £GBP
Estimated annual budget	550 – 950 £GBP

Indicative estimates (independent garage, UK market). Prices vary by region and year.