The Mercedes GLC is a mid-size premium SUV and one of the most popular premium SUVs in the UK. The X253 (2015–2022) and X254 (2023–present) generations are both on UK roads. Competing directly with the BMW X3, Audi Q5 and Volvo XC60. Available as SUV and coupe body styles, and with PHEV and mild hybrid powertrains. A favourite with company car drivers and families wanting premium quality with SUV practicality. The X254 generation was a significant step forward in technology and electrification.
Quick Facts — Mercedes GLC
Common Engines
2.0 petrol (GLC200/GLC300), 2.0 diesel (GLC200d/GLC220d/GLC300d), AMG GLC43 3.0 V6, PHEV (GLC300e/GLC300de), EQ versions
7 Most Common Mercedes GLC Problems
These are the faults most frequently seen on the Mercedes GLC by UK garages — ranked by how commonly they occur and what they cost to fix.
Diesel GLC models on short school run journeys develop DPF blockages very commonly — a large premium SUV diesel on city errands is a prime DPF failure candidate.
💷 Typical repair cost: £150–£1,800
The 9G-Tronic 9-speed automatic gearbox in the X253 GLC can develop hesitation, judder and harsh shifts — particularly when transmission oil services are skipped.
💷 Typical repair cost: £500–£3,500
AIRMATIC air suspension — popular on GLC — develops compressor, strut and valve block faults. The GLC sits low or the ride becomes noticeably harsh.
💷 Typical repair cost: £500–£2,500
GLC CDI diesel models require AdBlue. Running low or sensor faults cause warnings and prevent restarting after a threshold.
💷 Typical repair cost: £10–£900
The PHEV battery degrades over time on older X253 examples. Check real-world EV range before buying.
💷 Typical repair cost: £2,000–£6,000
4MATIC all-wheel-drive GLC models can develop transfer box wear when service intervals are neglected.
💷 Typical repair cost: £400–£2,000
Some X254 GLC owners report MBUX infotainment reboots and connectivity issues — addressed by software updates.
💷 Typical repair cost: £0–£300
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Mercedes GLC — MOT Tips
DPF and AdBlue warnings are MOT-relevant on CDI diesel GLCs. AIRMATIC suspension must hold correct ride height for MOT. 9G-Tronic warning lights must be clear. PHEV high-voltage warnings must be clear on PHEV models. 4MATIC AWD warning lights must be clear.
Engine management light on before your MOT? It's an automatic fail. Run a
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Mercedes GLC Tyres
Most Mercedes GLC models run 235/55 R18 or 235/50 R19 or 255/45 R20 or 255/40 R21 depending on trim level and year. Always check the placard inside the driver's door for the exact size for your vehicle.
Summary
The GLC is an excellent premium mid-size SUV. The X253 GLC220d with full service history is a brilliant used buy. The X254 is a significant improvement in quality and technology. AIRMATIC service history and 9G-Tronic gearbox oil changes are the two essential used buying checks. The GLC300e PHEV is compelling for company car drivers.
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