2020 Mercedes-Benz GLC MOT pass rate, common failures & what to check
In 2025, 89.7% of Mercedes-Benz GLCs first used in 2020 passed their MOT first time, against 86.0% for all cars first used in 2020. Across 34,856 GLC first tests from 2023 to 2025, the most common failure areas were tyres, brakes and visibility (wipers, washers and windscreen).
This page analyses first MOT tests for Mercedes-Benz GLCs first used in 2020 (all trims grouped): 2021 to 2025 for the pass-rate trend, and 2023 to 2025 for the failure and advisory analysis — plus what is worth checking before you buy one.
Data: DVSA anonymised MOT tests to December 2025 · Calculated by SortedCars · Updated October 2026
How the 2020 Mercedes-Benz GLC MOT pass rate has changed
Share of first tests passed in each year, GLCs first used in 2020 against all cars first used in 2020 (any make or fuel; not adjusted for mileage, fuel or use). In 2025 the GLC figure was 3.7 points higher.
View this chart as a table
| Test year | 2020 GLC | All cars first used 2020 | GLC first tests |
|---|---|---|---|
| 2021 | fewer than 500 tests | 84.7% | 15 |
| 2022 | fewer than 500 tests | 90.2% | 370 |
| 2023 | 91.5% | 87.7% | 11,988 |
| 2024 | 90.3% | 86.9% | 11,623 |
| 2025 | 89.7% | 86.0% | 11,245 |
Common 2020 Mercedes-Benz GLC MOT failures
Share of the 3,301 failed first tests (2023–2025) with at least one failure in each area. A test can fail in more than one area, so the shares add up to more than 100%.
Most common failure items
| DVSA failure item | Share of failed first tests | Tests |
|---|---|---|
| Tyre condition: has a cut in excess of the requirements deep enough to reach the ply or cords | 21.2% | 699 |
| Tread depth: below requirements of 1.6mm | 14.0% | 461 |
| Tyre condition: has ply or cords exposed | 13.1% | 431 |
| Ball joint: excessively worn | 9.3% | 307 |
| Brake pads: less than 1.5 mm thick | 6.6% | 219 |
Item names are DVSA’s own wording. 2023–2025 combined.
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Typical repair costs for common MOT failures
Typical UK garage prices for the job, not for a GLC in particular, and not a quote.
| Failure item | Typical job | Typical UK price | Usual range |
|---|---|---|---|
| Ball joint: excessively worn | Ball joint replacement | £90 | £60–£150 |
From published UK repair-cost guides, checked September 2026. Only jobs with a published typical price are shown.
What to check on a 2020 Mercedes-Benz GLC before buying
The three areas where failed first tests most often had a fault, 2023–2025.
- Tyres. Worth checking the tread depth across the whole width of each tyre, and the sidewalls for cuts, cracks and bulges.
- Brakes. Worth looking at the discs and pads through the wheel spokes for scoring and a worn lip, and noticing on the test drive whether the car pulls to one side or the pedal feels long.
- Wipers and windscreen. Worth checking that the wipers clear the screen cleanly, that the washers work, and that there are no chips or cracks in the driver’s view.
Common 2020 Mercedes-Benz GLC MOT advisories
Advisories are points the tester noted that did not fail the car. Most common on 2020 GLCs, as a share of all 34,856 first tests, 2023–2025.
| DVSA advisory item | Share of first tests | Tests |
|---|---|---|
| Tread depth: worn close to legal limit/worn on edge | 14.9% | 5,196 |
| Brake pads: wearing thin | 6.3% | 2,181 |
| Tyre condition: slightly damaged/cracking or perishing | 3.5% | 1,225 |
| Child Seat fitted not allowing full inspection of adult belt | 3.1% | 1,071 |
| Ball joint: has slight play | 2.8% | 988 |
Questions about the 2020 Mercedes-Benz GLC MOT
What is the MOT pass rate of a 2020 Mercedes-Benz GLC?
In 2025, 89.7% of GLCs first used in 2020 passed their MOT first time, against 86.0% for all cars first used in 2020. A car fixed during the test counts as a fail.
What does a 2020 GLC most often fail its MOT on?
Tyres (in 54.3% of failed first tests, 2023–2025), brakes (14.3%) and visibility (wipers, washers and windscreen) (12.1%). The single most common item was “Tyre condition: has a cut in excess of the requirements deep enough to reach the ply or cords” (21.2%).
How often does a 2020 Mercedes-Benz GLC fail its MOT?
In 2025, 10.3% of first tests on GLCs first used in 2020 did not pass first time: 8.8% failed, and a further 1.4% had a fault fixed during the test (counted as a fail here). Across 2023–2025, 3,301 of 34,856 first tests did not pass first time.
What are the most common 2020 Mercedes-Benz GLC MOT advisories?
“Tread depth: worn close to legal limit/worn on edge” (on 14.9% of first tests, 2023–2025), “Brake pads: wearing thin” (6.3%), “Tyre condition: slightly damaged/cracking or perishing” (3.5%), “Child Seat fitted not allowing full inspection of adult belt” (3.1%) and “Ball joint: has slight play” (2.8%).
Is a 2020 Mercedes-Benz GLC reliable?
An MOT pass rate shows what failed at the test, not how reliable a car is. For this group of cars the first-time pass rate went from 91.5% in 2023 to 89.7% in 2025. For one particular car, its own MOT history matters more than the average.
Other cars first used in 2020
The most-tested cars from the same year. Each page uses the same method.
2020 Ford Fiesta MOT statistics · 2020 Vauxhall Corsa MOT statistics · 2020 Volkswagen Golf MOT statistics · 2020 Ford Focus MOT statistics · 2020 MINI Hatch MOT statistics
Checking a specific 2020 GLC?
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