Mercedes W205 C 300 264.920 258HP Engine ECU Control Unit A2649001200 Automatic

Mercedes W205 C 300 264.920 258HP Engine ECU Control Unit is a specialized electronic control unit designed to work with a gasoline engine and an automatic transmission. As an item from the Electronic control modules and ECUs group, it is responsible for precise management of the powertrain, ensuring stable performance and proper communication with other vehicle systems. This solution is dedicated to users who expect proven electronics matched to the specific configuration of the C 300 model.

Specifications and technical data

• SKU: A2649001200-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2649001200
• Substitutable numbers: A2649001200, A 264 900 12 00, 0261S22041, 0 261 S22 041
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the control unit

The presented engine control unit has been designed to work with the gasoline powertrain in the Mercedes C-Class W205 generation in the C 300 version. The controller manages key engine operating parameters, such as fuel injection, ignition, and cooperation with the automatic transmission, which translates into smooth acceleration, predictable throttle response, and stable operation across the full load range.

Thanks to the factory ECU architecture, full integration with the vehicle's communication bus, safety systems, and driver assistance systems is maintained. This is particularly important in modern designs, where the engine control unit is a central element of the entire electronic network.

Benefits of using an original control unit

Using an original control module in the Mercedes W205 C 300 allows for maintaining the consistency of the vehicle's configuration with the manufacturer's factory specifications. Proper matching to the gasoline engine and automatic transmission reduces the risk of communication errors, starting problems, or improper operation of onboard systems.

The main advantages of this solution include:

• maintaining the factory performance characteristics of the powertrain,
• proper cooperation with the vehicle's diagnostic systems,
• consistency with the software and equipment configuration of the specific model version,
• possibility of professional adaptation and coding at a specialized service center.

For the user, this means stable operation and easier diagnostics of potential future faults, without the need to bypass limitations typical of unverified replacements.

Application in the powertrain

The controller is designed to work in a powertrain based on a gasoline engine, while simultaneously cooperating with an automatic transmission. This configuration requires precise data exchange between the ECU and the transmission control module to ensure appropriate gear shift points, starting comfort, and predictable vehicle behavior in various driving modes.

A properly selected control unit has a direct impact on:

• smoothness of gear changes in automatic mode,
• powertrain response to load and the driver's driving style,
• engine stability at low and high RPMs.

As a result, the driver receives consistent, predictable vehicle behavior, in line with the characteristics of the C 300 version.

Characteristics of the used product

The offered engine control unit is a used item, which in practice means the possibility of achieving a favorable compromise between repair costs and maintaining the vehicle's original specification. In the case of automotive electronics, choosing a verified used module often allows for restoring full powertrain functionality without the need to invest in a new unit.

To better understand when it is worth choosing a used engine control unit and how to properly select such an element for a specific car, it is worth reading the guide: A second life for electronics – when is it worth opting for used engine controllers, comfort modules, and parking sensors?. The article discusses practical aspects of selecting and using used electronics in modern cars.

Integration with other modules and further expansion

In modern Mercedes vehicles, the engine control unit cooperates with many other electronic modules, creating an extensive network of controllers. In the case of extensive powertrain repairs or vehicle configuration upgrades, it is worth considering other elements from the same product group to maintain the consistency of the entire system.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as additional controllers, management modules, or ECU units, check the available parts in the Mercedes electronic control modules and ECUs category.

When making a decision about choosing original used components, it is also worth paying attention to the impact of such parts on the future value of the vehicle. The material discussing this topic in more detail may be helpful: Original used parts and the resale price of a car – how not to lose money?, which discusses the importance of using factory elements when selling a car later.