Mercedes-Benz GLS-Class common problems and MOT pass rate

In 2025, DVSA recorded 3,052 initial MOT tests on the Mercedes-Benz GLS-Class in Great Britain, and 86.5% passed first time. Here is where the rest failed.

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Mercedes-Benz GLS-Class at the MOT, 2025

Initial MOT tests: 3,052
Passed first timeAll cars and vans: 72.1%: 86.5%
Failed at firstIncluding 1.3% repaired at the test and passed (PRS): 13.5%
Had a dangerous defectAll cars and vans: 7.3%: 6.8%
Licensed in the UKEnd of 2026 Q2, plus 249 off the road (SORN): 3,582

Contains DVSA MOT data, Open Government Licence v3.0, year 2025.

Failure areas

Where the GLS-Class fails its MOT

The share of initial tests in 2025 with at least one fail or PRS item in each part of the MOT. A test can fail in more than one area, so these do not add up to the fail rate.

1Tyres
8.0%
Tread depth, cuts and bulges, the right size and type, valves and tyre pressure warning systemsAll cars and vans: 6.2%
2Lamps, reflectors and electrical equipment
1.6%
Headlamps and their aim, brake lights, indicators, fog and reversing lamps, warning lights, battery and wiringAll cars and vans: 10.8%
3Brakes
1.4%
Pedal and handbrake, pipes and hoses, discs, pads and drums, and how well the car stopsAll cars and vans: 6.4%
4Body, chassis and structure
1.1%
Corrosion and damage to the structure, the exhaust system, fuel system, doors, seats, towbar, bumpers and engine mountingsAll cars and vans: 3.3%
5Noise, emissions and leaks
0.9%
Exhaust emissions and smoke, exhaust noise and fluid leaksAll cars and vans: 3.2%
6Suspension
0.9%
Springs, shock absorbers, suspension arms and bushes, anti-roll bars, wheel bearings and axlesAll cars and vans: 9.0%
7Registration plates and VIN
0.7%
Number plates and the vehicle identification numberAll cars and vans: 0.3%
8Seat belts and airbags
0.6%
Seat belts, airbags and the airbag warning lightAll cars and vans: 1.0%
9Visibility
0.6%
The driver's view, windscreen damage, wipers, washers and mirrorsAll cars and vans: 4.4%
10Road wheels
0.5%
Damaged or loose wheels, wheel nuts and hubsAll cars and vans: 0.4%

This modelAll cars and vans

Parts

The parts that fail most

Share of initial tests with a fail or PRS item on each part, 2025.

ConditionTyres5.7%
Tread depthTyres2.6%
Mechanical brake componentsBrakes1.0%
TransmissionBody and structure0.9%
Headlamp aimLamps and electrics0.9%
Exhaust emissionsEmissions and leaks0.9%
Registration platesPlates and VIN0.7%
Suspension armsSuspension0.5%

By age

Pass rate by year first used

Older cars fail more often, so compare a car with others of its year. Cars up to 25 years old; years with fewer than 250 tests are left out.

First used	Tests	Passed first time	Dangerous defect
2022	382	84.8%	8.6%
2021	291	86.3%	7.2%
2020	395	85.8%	4.6%
2019	387	85.3%	6.7%
2018	556	85.8%	7.6%
2017	609	88.8%	6.4%
2016	385	86.8%	7.0%

Mileage

GLS-Class mileage by age

The median reading at the test: half the cars of that age had covered more, half less. Estimated from 1,000-mile bands, for cars up to 25 years old.

A car well above or below the typical figure is not a problem in itself, but the readings should rise steadily from one MOT to the next. A fall, or a long gap, is worth asking about.

Check a car's mileage record

Age at test	Median mileage	Readings
2 years	29,800 miles	309
3 years	33,800 miles	273
4 years	45,700 miles	356
5 years	51,000 miles	394
6 years	57,000 miles	490
7 years	67,200 miles	548
8 years	74,800 miles	520

Checking a particular GLS-Class?

Averages tell you what to look at. The registration tells you about this car: every MOT since 2005 with its failures and advisories, each mileage reading, and whether it is taxed.

Questions

Mercedes-Benz GLS-Class: common questions

Contains DVSA MOT data, Open Government Licence v3.0, year 2025.

What is the most common MOT failure on the Mercedes-Benz GLS-Class?

In DVSA's 2025 test records, the area that failed most often on the Mercedes-Benz GLS-Class was tyres: 8.0% of initial tests had at least one fail or PRS item there, against 6.2% for all cars and vans. Next came lamps, reflectors and electrical equipment (1.6%) and brakes (1.4%).

What is the MOT pass rate for the Mercedes-Benz GLS-Class?

86.5% of 3,052 initial MOT tests on the Mercedes-Benz GLS-Class in 2025 were a pass first time. Another 1.3% passed after small repairs made at the test station within the hour (PRS). Across all cars and vans, 72.1% passed first time.

Does a lower pass rate mean the Mercedes-Benz GLS-Class is unreliable?

Not on its own. MOT results depend on age, mileage and upkeep as much as on design, so a model with many older cars on the road will usually fail more often. The table by year compares cars of a similar age. What matters most is the record of the car you are looking at, so check its MOT history before you buy.

What counts as a dangerous defect?

One the tester judges to be a direct and immediate risk to road safety, or to have a serious impact on the environment. The car fails and should not be driven until it is repaired. 6.8% of initial tests on the Mercedes-Benz GLS-Class found at least one, against 7.3% for all cars and vans.

Where do these figures come from?

From DVSA's anonymised MOT test data for 2025, published under the Open Government Licence. We count initial tests on cars and light vans in Great Britain, as DVSA does in its own statistics: retests, appeals and abandoned tests are left out, and so are advisories and minor defects.

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