Cheap Mercedes-Benz CLA Ignition Switch

Most Mercedes-Benz CLA models, across both the first generation (C117, 2013–2019) and second generation (C118, 2019–present), use a keyless push-button ignition system rather than a traditional turn-key ignition switch. If your CLA has a conventional key barrel, it is worth double-checking your exact registration with a breaker, as the vast majority of CLAs left the factory without a traditional ignition switch. You may actually be looking for the ignition starter button, the steering column lock module, or the EIS (Electronic Ignition Switch) unit instead.

On the CLA, the component that controls ignition functions is typically the EIS (Electronic Ignition Switch) module, which sits in the steering column and reads the key fob or blade key to authorise starting. This is the part most breakers will list when you describe an ignition-related fault on a CLA. When contacting a breaker, give them your full registration so they can confirm the correct EIS unit for your specific build, as programming requirements can vary.

Both a 2015 and a 2017 CLA fall within the first-generation C117 range (2013–2019, facelifted 2016), so the physical unit may well be compatible, but EIS modules on Mercedes-Benz vehicles are VIN-coded and require programming to the receiving car. A used EIS unit from a breaker will need to be paired to your vehicle by a specialist with the appropriate Mercedes diagnostic equipment, regardless of whether the generations match. Always confirm the part number with the breaker against your registration before buying.

Trim level does not affect the ignition or EIS module fitted to the CLA — the relevant factors are the generation (C117 2013–2019 or C118 2019–present) and the specific build date, not whether the car is Sport, AMG Line, or Urban spec. You may find cosmetic differences around the steering column area between trims, but the functional ignition component itself is the same. Confirm the part number with the breaker using your registration to be certain.

The C117 CLA was facelifted in 2016, and while both pre- and post-facelift cars share the same underlying platform, there can be differences in the steering column electronics between build dates that may affect whether a pre-facelift EIS unit is a straight swap into a post-facelift car. This is exactly the kind of boundary question you should route to the breaker — give them your registration and ask them to cross-reference the part number on the unit they have. Do not assume it will simply plug in and work, as VIN coding will be required regardless.

No, the ignition barrel (or lock cylinder) and the EIS module are separate components — the barrel is the mechanical part that the key blade inserts into, while the EIS is the electronic module that reads the key and authorises the engine to start. Some CLAs have both a barrel and an EIS; others use purely electronic entry without a traditional barrel. Tell the breaker exactly what is faulty or damaged and describe the symptom, so they can identify and supply the correct component for your specific car.