Quick Facts — Mercedes GLC

Est. On UK Roads
130,000+
Years Made
2015–present
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.

1
DPF Blockage (CDI Diesel, X253)
High Priority
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
2
9G-Tronic Gearbox Issues (X253)
High Priority
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
3
Air Suspension Faults (AIRMATIC, X253)
High Priority
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
4
AdBlue System (CDI Models)
Watch
GLC CDI diesel models require AdBlue. Running low or sensor faults cause warnings and prevent restarting after a threshold.
💷 Typical repair cost: £10–£900
5
PHEV High-Voltage Battery (GLC300e/de)
Watch
The PHEV battery degrades over time on older X253 examples. Check real-world EV range before buying.
💷 Typical repair cost: £2,000–£6,000
6
Transfer Box Wear (4MATIC AWD)
Watch
4MATIC all-wheel-drive GLC models can develop transfer box wear when service intervals are neglected.
💷 Typical repair cost: £400–£2,000
7
MBUX Infotainment Glitches (X254)
Low Priority
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 Find Your Problem Now → to get the likely cause and repair cost before booking the test.

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.

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Frequently Asked Questions

What is the most common problem with the Mercedes GLC?

The most frequently reported issue on the Mercedes GLC is DPF Blockage (CDI Diesel, X253). 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.

How many Mercedes GLCs are on UK roads?

There are an estimated 130,000+ Mercedes GLCs currently on UK roads.

What tyres does the Mercedes GLC use?

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.

Will a warning light fail my Mercedes GLC's MOT?

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.

Similar Issues on Other Models

Citroën C3 Aircross — another AdBlue system case worth knowing about Citroën C5 Aircross — shares the same AdBlue system problem

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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Other Mercedes-Benz Models

Mercedes C-Class → Mercedes E-Class → Mercedes A-Class → Mercedes GLA →