The Mercedes GLA is a compact premium SUV — effectively a raised A-Class with SUV styling. The X156 (2013–2019) and H247 (2020–present) generations are both on UK roads. The H247 is a more genuinely spacious and refined SUV than its predecessor. Competing with the Audi Q3, BMW X1 and Volvo XC40. A popular choice for urban premium buyers wanting SUV styling without the size or running costs of a larger vehicle. The AMG GLA45 is a very rapid performance variant.
Quick Facts — Mercedes GLA
Common Engines
1.3 petrol (GLA180/GLA200), 2.0 petrol (GLA250), 1.5 diesel (GLA180d), 2.0 diesel (GLA200d/GLA220d), AMG GLA35/GLA45
6 Most Common Mercedes GLA Problems
These are the faults most frequently seen on the Mercedes GLA by UK garages — ranked by how commonly they occur and what they cost to fix.
Diesel GLA models on urban short journeys develop DPF blockages very frequently — a compact diesel SUV used as a city car is one of the worst DPF scenarios possible.
💷 Typical repair cost: £150–£1,200
The 7G-DCT dual-clutch automatic on the H247 GLA produces the same low-speed judder and hesitation as on the A-Class — one of the most commonly reported issues.
💷 Typical repair cost: £400–£2,500
H247 CDI diesel GLA models require AdBlue. Sensor faults and running low cause warnings.
💷 Typical repair cost: £10–£700
The mechatronic control unit on the 7G-DCT can fail on higher-mileage examples — causing gearbox warning lights and loss of drive.
💷 Typical repair cost: £600–£2,000
The MBUX system in the H247 GLA can freeze or require rebooting — a known characteristic that software updates address.
💷 Typical repair cost: £0–£1,000
Tailgate gas struts fail on older X156 GLA models — the boot lid falls rather than staying open.
💷 Typical repair cost: £50–£150
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Mercedes GLA — MOT Tips
DPF warning is an automatic MOT fail on diesel GLAs. AdBlue warning is MOT-relevant on H247 CDI models. 7G-DCT gearbox warning lights must be clear. MBUX faults can affect ADAS — all driver assistance systems must be operational. EML is an automatic fail.
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Mercedes GLA Tyres
Most Mercedes GLA models run 215/60 R17 or 235/50 R18 or 235/45 R19 or 245/40 R20 depending on trim level and year. Always check the placard inside the driver's door for the exact size for your vehicle.
Summary
The GLA is a stylish and practical compact SUV. The H247 GLA200 petrol manual is the most reliable and least complex combination. Avoid diesel for city use. The 7G-DCT auto judder is the main issue to be aware of — consider a manual gearbox if driving in heavy traffic regularly. The H247 is a much better car than the X156 in all respects.
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