Top Mercedes-Benz GLA fixes every owner should know

TL;DR

The Mercedes-Benz GLA has common faults, including electrical issues, air conditioning failures, suspension problems, brake wear, and engine management light alerts. Many of these issues can be addressed with DIY fixes, saving owners time and money, while more complex problems may require professional diagnostics or repairs.

Electrical Issues

Electrical faults are common in the GLA, particularly in models from 2014 to 2017. Symptoms include warning lights on the dashboard and malfunctioning features. A simple fix may involve replacing blown fuses or faulty wiring, which is often DIY-able. However, complex issues may need a garage’s diagnostic equipment, costing around £100 to £200 for labour.

Air Conditioning Problems

Many GLA owners report air conditioning failures, particularly in the 2015-2018 models. A common cause is a refrigerant leak. Recharging the system can be a DIY task, costing about £50 for the refrigerant. If the compressor is faulty, expect to pay £300 to £500 for parts and labour at a garage.

Suspension Issues

Suspension problems, especially in the 2016-2020 models, can lead to a rough ride. Common signs include knocking noises and uneven tyre wear. Replacing worn components like shock absorbers can cost £200 to £400 for parts, and garage labour might add £100 to £200. This fix addresses the issue, but if the problem persists, further inspection is needed.

Brake Wear

Brake wear is a common concern for GLA owners, particularly those driving in urban areas. Brake pads typically need replacement every 20,000 to 30,000 miles. DIY replacement of pads costs around £50 to £100 for parts. A garage will charge between £150 and £300, depending on the model year and labour costs.

Engine Management Light

If the engine management light comes on, it can indicate various issues, from minor to serious. A DIY fix might involve checking for loose connections or replacing a sensor, costing around £20 to £100 for parts. For more complex diagnostics, expect to pay £100 to £200 at a garage. Ignoring this light can lead to more significant problems, so it is best to address it promptly.

Mercedes-Benz GLA MOT record

From 90,019 recorded MOT tests, 14.2% failed.

MOT pass and failure rates by year of first registration
Registered	Tests	Failed	Median mileage
2023	215	3.7%	18,448 mi
2022	4,657	6.8%	22,662 mi
2021	8,536	6.8%	31,591 mi
2020	8,786	8.6%	33,874 mi
2019	16,435	12.4%	41,634 mi
2018	16,179	15.2%	50,733 mi
2017	12,609	17.4%	60,024 mi
2016	10,476	19.5%	69,627 mi

Most common reasons for failure

Tyre tread depth not in accordance with the requirements33.9%
A tyre seriously damaged26.1%
a brake lining or pad worn below 1.5mm16.8%
Brake disc or drum excessively weakened, insecure or fractured12.0%
A suspension joint dust cover missing or no longer prevents the ingress of dirt etc11.3%

Figures cover every Mercedes-Benz GLA tested in the DVSA dataset, not this specific car. Check a registration for the actual history of one vehicle.

Mercedes-Benz GLA official figures

Median across 14 variants on sale, diesel, electricity / petrol, petrol, petrol electric.

Combined economy

41.7 mpg

WLTP median across variants

CO2 emissions

161.5 g/km

Sets the first-year tax rate

Electric range

43 miles

Manufacturer WLTP figure

Official figures for new cars. Real economy varies with driving, load and conditions.

Frequently asked questions

What are common faults in the Mercedes-Benz GLA?

Common faults include electrical issues, faulty air conditioning, and suspension problems.

Can I fix the air conditioning issue myself?

Yes, recharging the system is often a DIY job, but deeper issues may require a garage.

How much does it cost to replace suspension components?

Parts can cost around £200-£400, with garage labour adding another £100-£200.

Is it safe to drive with electrical faults?

It depends on the fault. Some may affect safety features, so it’s best to get them checked.