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Mercedes-Benz GLB-Class Common Problems, Faults & Repair Costs (2026)

Based on official DVSA MOT test data. View the most common MOT failure categories, pass rates, and estimated repair costs for the Mercedes-Benz GLB-Class (2019–present).

MOT Pass Rate

86.0%4.0% above national avg (82%)

Reliability rating: Excellent — based on approx. 8,000 tests

Dangerous Defects

1.10%

Moderate risk

Retest Rate

9.8%

of failed tests need a retest

Top MOT Failure Categories

1

Lamps, reflectors and electrical equipment

Est. repair: £40–£200

12.2%
2

Suspension

Est. repair: £120–£450

10.8%
3

Brakes

Est. repair: £100–£350

9.5%
4

Tyres

Est. repair: £50–£120 per tyre

8.8%
5

Exhaust, fuel and emissions

Est. repair: £40–£200

5.5%

Where Faults Occur

28.0%

Front

26.0%

Rear

19.0%

Offside

Mileage Benchmarks

At 3 years

22,000 mi

At 5 years

N/A

At 10 years

N/A

Significantly higher or lower mileage than these benchmarks may indicate unusual usage patterns. Check the full MOT history for mileage consistency.

Is a Mercedes-Benz GLB-Class a Good Buy?

The Mercedes-Benz GLB-Class demonstrates above-average reliability based on MOT test data, with a 86.0% pass rate. This places it 4.0% above the national average, suggesting lower ongoing maintenance costs compared to many competitors.

While no car is without faults, lamps, reflectors and electrical equipment issues are the most common concern, affecting approximately 12.2% of failed tests. These tend to be relatively affordable to fix at £30–£150.

Mercedes-Benz GLB-Class MOT Check & History

View detailed MOT pass rates by year, mileage benchmarks, and full test history data for the Mercedes-Benz GLB-Class.

View Mercedes-Benz GLB-Class MOT Data

Check a Specific Mercedes-Benz GLB-Class

Enter a registration number to view the full MOT history for any Mercedes-Benz GLB-Class.

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Other Mercedes-Benz Models

Mercedes-Benz C-Class

80.5%

Lamps, reflectors and electrical equipment →

Mercedes-Benz A-Class

82.8%

Lamps, reflectors and electrical equipment →

Mercedes-Benz E-Class

79.2%

Lamps, reflectors and electrical equipment →

Mercedes-Benz GLA-Class

84.5%

Lamps, reflectors and electrical equipment →

Mercedes-Benz B-Class

79.8%

Lamps, reflectors and electrical equipment →

Mercedes-Benz GLC-Class

85.2%

Lamps, reflectors and electrical equipment →

View all Mercedes-Benz models

Frequently Asked Questions

What are the most common MOT faults on a Mercedes-Benz GLB-Class?
The top MOT failure on the Mercedes-Benz GLB-Class is Lamps, reflectors and electrical equipment, accounting for approximately 12.2% of all failures. Other common issues include suspension and brakes.
What is the Mercedes-Benz GLB-Class MOT pass rate?
The Mercedes-Benz GLB-Class has an estimated MOT pass rate of 86.0%, which is 4.0% above the national average of 82%. This rates the Mercedes-Benz GLB-Class as "Excellent" for MOT reliability.
Is the Mercedes-Benz GLB-Class reliable?
Based on DVSA MOT data, the Mercedes-Benz GLB-Class has a excellent reliability record with a 86.0% pass rate. It has a dangerous defect rate of 1.10% and a retest rate of 9.8%.
How much does it cost to fix common Mercedes-Benz GLB-Class MOT failures?
Typical repair costs for Mercedes-Benz GLB-Class MOT failures range from £30–£200 for lamps, reflectors and electrical equipment issues to £120–£450 for suspension problems. Prices are estimates based on typical UK independent garage rates.
What mileage should a Mercedes-Benz GLB-Class have?
Based on MOT test data, the average Mercedes-Benz GLB-Class covers approximately 22,000 mi by 3 years, N/A by 5 years, and N/A by 10 years. Significantly higher or lower mileage may warrant closer inspection.
Should I buy a used Mercedes-Benz GLB-Class?
The Mercedes-Benz GLB-Class is generally a solid choice based on MOT data. Check the full MOT history of any specific vehicle before purchasing, paying particular attention to lamps, reflectors and electrical equipment issues and mileage consistency.
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