Top fixes
Mercedes-Benz CLA top fixes: how owners handle the common issues
Practical fixes for the common Mercedes-Benz CLA faults owners run into.
Updated 4th September 2026 DVSA data: Across 73,658 recorded MOT tests, 16.3% failed.
More on the Mercedes-Benz CLA
The Mercedes-Benz CLA is a stylish compact car that offers a blend of performance and luxury. This article outlines practical fixes for the most frequently reported problems by CLA owners, helping you keep your car in top condition.
Electrical Problems
Electrical issues are among the most common complaints from Mercedes-Benz CLA owners. Problems can range from malfunctioning infotainment systems to faulty sensors. If you experience issues with the electrical system, start by checking the battery and fuses. A weak battery can cause various electrical problems, so ensure it is fully charged and in good condition.
If the battery is fine, consider performing a software update on the car’s infotainment system. Mercedes often releases updates to fix bugs and improve functionality. If issues persist, a visit to a qualified technician may be necessary to diagnose and repair any underlying faults in the wiring or control modules.
Engine Performance
Some CLA owners report engine performance issues, including rough idling or poor acceleration. Regular maintenance is crucial to prevent these problems. Ensure that you follow the recommended service schedule, which includes timely oil changes and air filter replacements. Using high-quality fuel can also help maintain engine performance.
If you notice a drop in performance, check for any warning lights on the dashboard. A diagnostic scan can reveal error codes that indicate specific issues, such as a faulty mass airflow sensor or spark plugs. Addressing these issues promptly can prevent more significant problems down the line.
Suspension and Steering
The CLA’s suspension and steering systems can sometimes develop problems, particularly as the vehicle ages. Owners may experience a knocking noise when driving over bumps or a vague steering feel. Regularly inspecting the suspension components, such as shock absorbers and bushings, can help identify wear and tear early.
If you notice any unusual noises or handling characteristics, it is advisable to have a professional inspect the suspension system. Replacing worn components can significantly improve ride quality and handling. Additionally, ensure that the wheel alignment is checked regularly, as misalignment can lead to uneven tyre wear and affect steering precision.
Brake Issues
Brake problems are another common concern for CLA owners. Symptoms may include squeaking or grinding noises when braking, which often indicate worn brake pads or discs. Regularly checking the brake system is essential for safety and performance. If you notice any unusual sounds, have the brakes inspected promptly.
Replacing brake pads and discs is a straightforward fix that can often be done at home with the right tools. However, if you are not confident in performing the work yourself, it is best to consult a professional. Keeping the brake fluid topped up and ensuring the system is free from air bubbles can also enhance braking performance.
Transmission Troubles
Transmission issues can be particularly concerning for CLA owners. Symptoms may include harsh shifting or slipping gears. Regular transmission fluid changes are vital to maintaining the health of the transmission. If you experience any issues, check the fluid level and condition; dirty or low fluid can lead to significant problems.
If the transmission is still not performing correctly after checking the fluid, a diagnostic test may be necessary to identify the issue. Some problems may require a simple software update, while others could necessitate more extensive repairs. Addressing transmission issues early can save you from costly repairs later.
Interior Wear and Tear
The interior of the CLA is designed for comfort and luxury, but some owners report issues with wear and tear. Common problems include worn upholstery and malfunctioning electronic controls. To prevent premature wear, regularly clean and condition the upholstery and dashboard materials.
If you notice any electronic controls malfunctioning, start by checking the fuses. Sometimes, a simple reset of the system can resolve minor glitches. For more significant issues, professional repair may be required to replace faulty components or wiring. Keeping the interior in good condition not only enhances your driving experience but also helps maintain the vehicle’s resale value.
By addressing these common issues proactively, you can ensure that your Mercedes-Benz CLA remains reliable and enjoyable to drive. Regular maintenance and timely repairs will keep your vehicle performing at its best for years to come.
Mercedes-Benz CLA recall record
73 recalls have been issued for the Mercedes-Benz CLA, between 2014 and 2026.
Electric drive unit power electronics
R/2026/315Issued 25 August 2026
Mercedes-Benz AG has determined that in certain CLA (174 platform) and GLB (244 platform) vehicles the circuit board for the power electronics of the rear electric drive unit might not meet the specifications.
Remedy:As a remedy Mercedes-Benz AG via its Mercedes-Benz service partners will replace the power electronics of the rear electric drive unit on the affected vehicles.
Affects cars built Oct 2025 to Mar 2026
Software version of communication module
R/2026/203Issued 5 June 2026
Mercedes-Benz AG has determined that on certain CLA (174 platform) and GLB (244 platform) vehicles the software of the communication module might not meet the intended specification.
Remedy:As a remedy Mercedes-Benz AG via its Mercedes-Benz service partners will update the software on the affected vehicles.
Affects cars built May 2025 to Jan 2026
Bolting of front seats and belt buckles
R/2025/533Issued 6 January 2026
Mercedes-Benz AG has determined that on certain CLA (174 platform) vehicles the bolting of the front seats and/or belt buckles might not meet specifications.
Remedy:As a remedy Mercedes-Benz AG via its Mercedes-Benz service partners will rework the front seat and belt buckle bolting on the affected vehicles.
Affects cars built May 2025 to Jul 2025
SRPC2523 - Variant of 48V Wiring Harness
R/2025/556Issued 5 January 2026
Mercedes-Benz AG has determined that on certain CLA (178 platform) vehicles with 4-cylinder gasoline engine the 48V wiring harness might not meet specifications.
Remedy:As a remedy Mercedes-Benz AG via its Mercedes-Benz service partners will check the wiring harness on the affected vehicles and rework it if necessary.
Affects cars built Nov 2025 to Dec 2025
69 older recalls not shown.
A recall applies to a build range, not to every car of this model. Check a registration to see whether one specific vehicle has an outstanding recall.
Mercedes-Benz CLA MOT record
From 73,658 recorded MOT tests, 16.3% failed.
| Registered | Tests | Failed | Median mileage |
|---|---|---|---|
| 2023 | 653 | 5.7% | 27,689 mi |
| 2022 | 11,132 | 10.6% | 27,756 mi |
| 2021 | 9,394 | 11.8% | 37,145 mi |
| 2020 | 7,367 | 13.0% | 42,534 mi |
| 2019 | 8,122 | 14.0% | 47,685 mi |
| 2018 | 8,290 | 16.9% | 57,380 mi |
| 2017 | 8,175 | 19.7% | 69,613 mi |
| 2016 | 7,528 | 21.0% | 79,261 mi |
Most common reasons for failure
- Tyre tread depth not in accordance with the requirements35.0%
- A tyre seriously damaged28.1%
- a brake lining or pad worn below 1.5mm15.4%
- Brake disc or drum excessively weakened, insecure or fractured12.2%
- A tyre cords visible or damaged9.3%
Figures cover every Mercedes-Benz CLA tested in the DVSA dataset, not this specific car. Check a registration for the actual history of one vehicle.
Mercedes-Benz CLA official figures
Median across 28 variants on sale, diesel, electricity, electricity / petrol, petrol, petrol electric.
- Combined economy
- 44.2 mpg
- WLTP median across variants
- CO2 emissions
- 147 g/km
- Sets the first-year tax rate
- Electric range
- 241.5 miles
- Manufacturer WLTP figure
Official figures for new cars. Real economy varies with driving, load and conditions.
Frequently asked questions
What common issues should I look for in a used Mercedes-Benz CLA?
Common issues include electrical faults, problems with the transmission, and wear on the suspension components. It's also wise to check for any signs of rust or damage.
How can I tell if the engine is in good condition?
Listen for any unusual noises when the engine is running and check for any warning lights on the dashboard. A thorough service history can also indicate how well the engine has been maintained.
Are there any specific recalls for the Mercedes-Benz CLA?
Recalls are issued against individual vehicles rather than a model as a whole, so a model-level yes or no would be guesswork. Enter the registration on Honest Car Check and we check the DVSA record for that specific car. Where DVSA holds no status, confirm it with a franchised dealer using the VIN.
What should I do if I find a fault during my vehicle check?
If you find a fault, it's best to discuss it with the seller and consider having the issue repaired before purchase. You may also want to negotiate the price based on the repairs needed.
How often should I service my Mercedes-Benz CLA?
It is recommended to service your CLA at least once a year or every 10,000 to 15,000 miles, whichever comes first. Regular servicing helps maintain performance and reliability.
What are the signs of wear on the suspension system?
Signs of wear include a rough ride, uneven tyre wear, and knocking noises when driving over bumps. It's important to have the suspension checked if you notice any of these symptoms.
Is it worth getting a pre-purchase inspection for a used CLA?
Yes, a pre-purchase inspection can uncover hidden issues that may not be visible during a standard check. It provides peace of mind and can save you money on future repairs.
Sources
- DVSA anonymised MOT tests and results (Open Government Licence v3.0)
- VCA new car fuel consumption and emissions data (Open Government Licence v3.0)
- DVSA vehicle safety recalls (Open Government Licence v3.0)