The gearbox of the Mercedes-Benz CLA-Class is one of the most heavily used components on this German manufacturer's compact. Derived from the A-Class, the CLA-Class spans two generations: the first launched in 2013 (type 117) and the second in 2019 (type 118). Its most powerful sports variant produces up to 421 bhp, with a top speed of 270 km/h and a 0–100 km/h sprint in just four seconds. Even so, these impressive figures don't make the transmission immune to faults. What should you do if something goes wrong? What practical solutions are available? EDEN BOITES is here to help.
Understanding the Mercedes-Benz CLA-Class Gearbox
Whichever generation of CLA-Class you drive, both versions share a number of common characteristics. The standard model uses front-wheel drive, with engine power sent to the front wheels — a layout that aids handling and fuel economy. The sports version, meanwhile, benefits from four-wheel drive for a more dynamic driving experience.
The same logic applies to the gearbox. On the standard CLA, this can be a manual (six-speed) or automatic (seven-speed). The sports range is always paired with a seven- or eight-speed automatic, depending on the year of production. The engine line-up covers both petrol and diesel options, the latter drawing on a unit developed through a partnership with a French manufacturer. For a clear explanation of how each component works, take a look at our article explaining how a gearbox works.
Recognising the Signs of a Gearbox Fault on the CLA-Class
A gearbox fault on the Mercedes-Benz CLA-Class rarely strikes without warning: it is usually preceded by tell-tale signs that are worth knowing. By taking your car to a garage at the first sign of trouble and describing the symptoms accurately to a professional mechanic, you make it much easier to reach a reliable diagnosis.
- Unusual noises such as grinding or squealing coming from the gearbox;
- A sensation of slipping, particularly when pulling away;
- Resistance in the clutch pedal or gear lever;
- Oil leaks spotted beneath the vehicle;
- A general loss of power.
Never ignore these warning signs: acting promptly limits further damage to the entire transmission system.
Gearbox Oil Changes: an Essential Maintenance Habit
Often confused with engine oil, gearbox oil performs a detergent function and gradually accumulates metallic particles. Once saturated, it can no longer do its job properly. Leaks can also cause the level to drop. It is therefore advisable to check its condition and quantity periodically, then carry out an oil change every 60,000 km (or every two years, whichever comes first) for an automatic gearbox. For a manual gearbox, this maintenance interval is longer: plan for it approximately every five years. The same principle applies to other models in the range, as detailed in our guide to A-Class gearbox maintenance.
Dealing with More Complex CLA-Class Gearbox Faults
Most gearbox faults can be repaired directly at the garage. However, there are times when the problem is deemed too complex, and the mechanic recommends a full gearbox replacement. A brand-new unit offers reliability, but comes at a very high cost and often involves long lead times, as these parts are primarily destined for vehicles coming off the production line. A second-hand gearbox, whose condition cannot be verified before fitting, is best avoided.
Instead, consider our reconditioned Mercedes gearboxes, sold on an exchange basis. Each one is stripped down part by part, thoroughly cleaned, inspected and tested. The result: a unit equivalent to new, at a price closer to second-hand. If you can't find the reference you need, we can take in your current gearbox and recondition it to the same quality standard. You can also compare symptoms across other models by reading our article on how to resolve gearbox faults on the R-Class.
Frequently Asked Questions
How do I know if my CLA-Class gearbox is at the end of its life?
Several warning signs should put you on alert: abnormal noises, slipping when pulling away, resistance when changing gear, oil leaks, or a loss of power. Only a mechanic will be able to confirm, after diagnosis, whether a repair is sufficient or whether a replacement is necessary.
Is a reconditioned gearbox suitable for the CLA-Class?
Yes. Our reconditioned exchange gearboxes are checked and tested before dispatch, making them a credible alternative to buying a new unit for your CLA-Class.
How often should I change the gearbox oil on my CLA-Class?
Allow for approximately every 60,000 km or every two years for an automatic gearbox, and approximately every five years for a manual gearbox, taking your driving conditions into account.
Why Choose EDEN BOITES?
EDEN BOITES specialises in reconditioned exchange gearboxes for Mercedes-Benz vehicles, including the CLA-Class. Our gearboxes come with a warranty of up to 24 months. Payment can be spread over several instalments, with up to 10 instalments available. Delivery is available throughout France and the European Union, with lead times confirmed on quote. Our exchange service comes with a satisfaction or money-back guarantee, subject to our Terms and Conditions. Browse our dedicated range now on the Mercedes gearboxes page and request your online quote — all you need is your registration number.
