Common Mercedes GLS Problems, Faults, and Repair Costs
Typical MOT issues to check on the Mercedes GLS, with rough repair costs, and its MOT pass rate for each model year. Based on 4,597 MOT tests across 4 model years (DVSA data for tests carried out in 2024, retests included).
Segment: premium performance | Fuel: Diesel
92%
Mercedes GLS pass rate
87%
Mercedes average
82%
All-model average
The Mercedes GLS has an average MOT pass rate of 92%, which is 5 points above the Mercedes average and 10 points above the average across all models in our data. The Mercedes GLS has maintained consistent MOT pass rates across model years, varying by only 2 percentage points.
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Common MOT Issues to Check on the Mercedes GLS
Typical issues for a car of this age and type, estimated from its age, fuel type and engine size (not counted from its MOT records), with rough repair costs
Brakes
High likelihood£80 - £450
Typical repair cost
Common advisories:
Brake discs worn, brake pads thin, handbrake adjustment needed
Failure points:
Brake disc excessively worn, brake pipe corroded, brake efficiency below minimum
Suspension
High likelihood£150 - £600
Typical repair cost
Common advisories:
Suspension arm bush worn, shock absorber misting, spring corroded
Failure points:
Coil spring broken, ball joint excessive play, shock absorber leaking
Lights
High likelihood£15 - £200
Typical repair cost
Common advisories:
Headlamp aim slightly out, lens deteriorated
Failure points:
Headlamp not working, brake light not functioning, indicator failure
Tyres
High likelihood£50 - £300
Typical repair cost
Common advisories:
Tyre approaching legal limit, slight damage to sidewall
Failure points:
Tyre below minimum tread depth, tyre has a cut exposing ply
Exhaust & Emissions
High likelihood£80 - £800
Typical repair cost
Common advisories:
Exhaust mounting corroded, slight exhaust leak
Failure points:
Exhaust emissions exceed limits, catalytic converter efficiency low, DPF warning
Steering
Moderate likelihood£100 - £500
Typical repair cost
Common advisories:
Track rod end has slight play, steering rack boot deteriorated
Failure points:
Steering rack leaking, track rod ball joint worn beyond limits
Body & Structure
Moderate likelihood£200 - £1200
Typical repair cost
Common advisories:
Surface corrosion on subframe, slight body panel damage
Failure points:
Structural corrosion, body mounting corroded through, chassis weakness
Windscreen & Wipers
Lower likelihood£10 - £350
Typical repair cost
Common advisories:
Minor windscreen chip, wiper blade deteriorated
Failure points:
Windscreen crack in swept area, wiper does not clear windscreen
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Mercedes GLS Reliability by Year
MOT pass rate for each model year, from DVSA data for tests carried out in 2024 (retests included). Newer cars usually pass more often simply because they are younger. Highest and lowest are marked among years with 100+ tests that were at least three years old when tested. Fuel and engine size are a guide only.
Mercedes GLS Running Costs
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What are the most common Mercedes GLS problems?
Typical issues to check on a Mercedes GLS of this age and type are brakes, suspension, lights, tyres and exhaust & emissions. These are estimated from its age, fuel type and engine size, not counted from its MOT records. Across 4,597 MOT tests (DVSA MOT data for tests in 2024, retests included), 92% ended in a pass.
Is the Mercedes GLS reliable?
The Mercedes GLS has an average MOT pass rate of 92%, from 4,597 MOT tests. That is 10 points above the average across all models in our data (82%), a better than average result. Pass rates fall as cars age, so compare it with cars of a similar age.
Which year Mercedes GLS is the most reliable?
Of the years with at least 100 tests that were old enough for a routine MOT, the 2016 Mercedes GLS has the highest MOT pass rate: 93% of its 983 tests ended in a pass. The 2018 has the lowest at 90%. Newer cars usually pass more often simply because they are younger, so the pass rate is only part of the picture.
How much does it cost to fix common Mercedes GLS faults?
As a rough guide, brake work on a Mercedes GLS typically costs £80-£450 and suspension repairs £150-£600, while exhaust and emissions fixes can cost £80-£800. Lighting and wiper fixes are usually under £200.
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Other Mercedes Models
Common problems pages for other Mercedes models