Mercedes-Benz GLC reliability, MPG and running costs
Figures updated
The Mercedes-Benz GLC is a large suv; the latest version we cover is the X254 (2022–). In 2024 MOT tests it scored 139 for reliability (100 is average), ranking 84 of 442, and 13.1% failed first time against a UK average of 28.5%. Its most common MOT failure is ball joint (2.7% of tests). Boot space is 620 litres (1,680 with the seats folded).
Mercedes-Benz GLC key specs (X254 (2022–), 5-door SUV)
Price new
£54,970 to £77,475
Boot
620 litres (1,680 seats folded)
Seats
5
Size (L × W × H)
4,721 × 1,918 × 1,631mm
Power
197–269 PS
0–62mph
6.2–8.0 sec
Euro NCAP
5 stars (2022)
2022 on models; figures vary by version. Prices from the September 2026 price list. Sources: tools.mercedes-benz.co.uk, euroncap.com.
Ranked 84 of 442 cars in the 2024 MOT Reliability League, and 11 of 24 large SUVs
In 2024, 75,829 Mercedes-Benz GLCs aged 3 to 20 had an MOT and 13.1% failed first time (UK average 28.5%). Taking age and mileage into account, the Mercedes-Benz GLC is 28% less likely to fail than the average car of the same age and mileage. At the first MOT, at three years old, 9.2% failed (UK 12.7%).
First-time fail rate
13.1%
UK 28.5%
Fail rate at 3 years
9.2%
UK 12.7%
Average miles a year
9,400
Typical age at test: 5 years
Mercedes-Benz GLC MOT failure rate by age
Most common Mercedes-Benz GLC MOT faults
- Ball joint: ball joint excessively worn2.7% of tests
- Condition: has a cut in excess of the requirements deep enough to reach the ply or cords1.9% of tests
- Tread depth: tread depth below requirements of 1.6mm1.8% of tests
- Malfunction indicator lamp: inoperative or indicates a malfunction1.3% of tests
- Condition: has ply or cords exposed1.3% of tests
- Brake pads: less than 1.5 mm thick0.9% of tests
What the Mercedes-Benz GLC fails on
| Area | Tests failing | vs similar cars |
|---|---|---|
| Tyres | 5.5% | About average |
| Suspension | 3.4% | ▲ 1.2× as often |
| Brakes | 1.7% | ▼ 54% less often |
| Exhaust and emissions | 1.4% | About average |
| Visibility | 1.3% | ▼ 62% less often |
| Lights and electrics | 1.1% | ▼ 77% less often |
| Body and structure | 0.8% | ▼ 17% less often |
| Seat belts and airbags | 0.2% | ▼ 51% less often |
| Wheels | 0.2% | ▼ 38% less often |
| Steering | 0.0% | ▼ 94% less often |
How big is the Mercedes-Benz GLC's boot?
The X254 (2022–) Mercedes-Benz GLC has 620 litres of boot space with the rear seats up and 1,680 litres with them folded, according to the manufacturer. That's the 5th biggest of the 8 large SUVs we compare; the Land Rover Discovery has the most, at 922 litres.
What MPG does the Mercedes-Benz GLC do?
Official economy for the Mercedes-Benz GLC ranges from 21.9 to 56.5mpg across the 91 versions listed by the Vehicle Certification Agency (2016–2025). A typical petrol version manages 28mpg and a typical diesel 48.7mpg. Expect 10–15% less in real-world driving.
Work out a journey's fuel costHow much is road tax on a Mercedes-Benz GLC?
Any Mercedes-Benz GLC first registered from April 2017 pays the standard rate of £200 a year after its first year (2026/27 rates). Versions with a list price over £40,000 pay an extra £440 a year in years two to six; every current version is over that. A Mercedes-Benz GLC registered between March 2001 and March 2017 is taxed on its CO2: £170 to £760 a year.
Work out tax for a specific carMercedes-Benz GLC specs and running costs
Official figures for 91 versions sold in the UK between 2016 and 2025.
Fuel types
Diesel, Hybrid, Petrol, Plug-in hybrid
Official economy
21.9–56.5 mpg
CO2
41–293 g/km
Power
194–680 PS
| Version | Fuel | Economy | CO2 | Car tax | Company car tax |
|---|---|---|---|---|---|
| GLC Coupe GLC 220 d 4MATIC197 PS · A9 · listed 2025 | Diesel | 56.5 mpg | 132g | £200 | 36% |
| GLC SUV GLC 220 d 4MATIC197 PS · A9 · listed 2025 | Diesel | 55.4 mpg | 134g | £200 | 36% |
| GLC Coupe GLC 300 d 4MATIC269 PS · A9 · listed 2025 | Diesel | 51.4 mpg | 144g | £200 | 37% |
| GLC SUV GLC 300 d 4MATIC269 PS · A9 · listed 2025 | Diesel | 51.4 mpg | 145g | £200 | 37% |
| GLC Coupe GLC 300 4MATIC258 PS · A9 · listed 2025 | Petrol | 39.8 mpg | 161g | £200 | 37% |
| GLC SUV GLC 300 4MATIC258 PS · A9 · listed 2025 | Petrol | 39.2 mpg | 163g | £200 | 37% |
| GLC Coupe AMG GLC 43 4MATIC421 PS · A9 · listed 2025 | Petrol | 29.4 mpg | 218g | £200 | 37% |
| GLC SUV AMG GLC 43 4MATIC421 PS · A9 · listed 2025 | Petrol | 28.5 mpg | 225g | £200 | 37% |
| GLC Coupe GLC 300 e 4MATIC313 PS · A9 · listed 2025 | Plug-in hybrid | 141.3 mpg | 46g | £200 | 7% |
| GLC SUV GLC 300 e 4MATIC313 PS · A9 · listed 2025 | Plug-in hybrid | 134.5 mpg | 47g | £200 | 7% |
| GLC Coupe GLC 300 de 4MATIC333 PS · A9 · listed 2025 | Plug-in hybrid | 176.6 mpg | 41g | £200 | 7% |
| GLC SUV GLC 300 de 4MATIC333 PS · A9 · listed 2025 | Plug-in hybrid | 176.6 mpg | 41g | £200 | 7% |
| GLC Coupe AMG GLC 63 S E PERFORMANCE476 PS · A9 · listed 2025 | Plug-in hybrid | 29.1 mpg | 221g | £200 | 37% |
| GLC SUV AMG GLC 63 S E PERFORMANCE680 PS · A9 · listed 2025 | Plug-in hybrid | 29.1 mpg | 221g | £200 | 37% |
| GLC Coupe Mercedes-AMG GLC 43 4MATIC310 PS · A9 · listed 2024 | Petrol | 28 mpg | 231g | £200 | 37% |
Economy and CO2 are official WLTP figures. Car tax is the yearly rate at current rates for a car first registered in the year listed, before any expensive car supplement. Company car tax is the 2026/27 benefit-in-kind rate. Showing the 15 most recent of 91 versions.
What a Mercedes-Benz GLC costs to fuel
- petrol, typical official 28mpg…
- diesel, typical official 48.7mpg…
Official figures are usually 10–15% better than real-world driving.
Work out a journey in a Mercedes-Benz GLCBuying a used Mercedes-Benz GLC?
Check the MOT history of the exact car: every result, advisory and mileage reading, free.
Compare the Mercedes-Benz GLC with other large SUVs
Reliability, economy, car tax and running costs side by side.
Other Mercedes-Benz models
Frequently asked questions
›Is the Mercedes-Benz GLC reliable?
Its MOT record is better than average: the Mercedes-Benz GLC is 28% less likely to fail than the average car of the same age and mileage, with a reliability score of 139 in our 2024 league (100 is average).
›What are common problems with the Mercedes-Benz GLC?
The most common MOT fault is “Ball joint: ball joint excessively worn”, found in 2.7% of tests.
›How big is the Mercedes-Benz GLC's boot?
The X254 (2022–) Mercedes-Benz GLC has 620 litres of boot space with the rear seats up and 1,680 litres with them folded, according to the manufacturer. That's the 5th biggest of the 8 large SUVs we compare; the Land Rover Discovery has the most, at 922 litres.
›What MPG does the Mercedes-Benz GLC do?
Official economy for the Mercedes-Benz GLC ranges from 21.9 to 56.5mpg across the 91 versions listed by the Vehicle Certification Agency (2016–2025). A typical petrol version manages 28mpg and a typical diesel 48.7mpg. Expect 10–15% less in real-world driving.
›How much is road tax on a Mercedes-Benz GLC?
Any Mercedes-Benz GLC first registered from April 2017 pays the standard rate of £200 a year after its first year (2026/27 rates). Versions with a list price over £40,000 pay an extra £440 a year in years two to six; every current version is over that. A Mercedes-Benz GLC registered between March 2001 and March 2017 is taxed on its CO2: £170 to £760 a year.
›How many Mercedes-Benz GLCs fail their MOT?
13.1% of Mercedes-Benz GLCs aged 3 to 20 failed their MOT first time in 2024, and 9.2% failed at their first MOT.
Sources: DVSA anonymised MOT tests 2024, all versions of the Mercedes-Benz GLC combined (Open Government Licence v3.0); official economy and CO2 from Vehicle Certification Agency data, © Crown copyright. VCA cannot accept liability for its accuracy. How we calculate the league.