Mercedes W205 C300de OM654.920 306HP Engine Unit ECU Kit A6549007900 Automatic

The Mercedes W205 C300De OM654.920 306HP Engine ECU Kit A6549007900 Automatic is a complete electronic control module designed for the diesel-hybrid version of the W205 C-Class. The kit is matched to automatic transmission configurations, ensuring cohesive powertrain operation and stable engine performance. This solution is for users seeking original engine electronics with preserved functionality and full compatibility with the vehicle's factory architecture.

Specifications and technical data

• SKU: A6549007900-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6549007900
• Substitutable numbers: A6549007900, A 654 900 79 00, A6549016200, A 654 901 62 00, 0281036840, 0 281 036 840, A2059007147, A 205 900 71 47, 5DK014333, 5DK 014 333
• Fuel type: Diesel
• Gearbox type: Automatic
• Part type: Engine Control Unit (ECU)
• Category: ECUs & Computer Modules

Purpose and Compatibility

The presented engine ECU kit is dedicated to the Mercedes W205 C300De model with the OM654.920 engine producing 306 HP, powered by Diesel fuel and paired with an automatic transmission. It is responsible for controlling engine operation, coordinating combustion parameters, and integrating with other vehicle systems such as the powertrain, safety systems, and onboard electronics.

By using an original module from the Electronic Control Modules and Controllers group, compliance with the vehicle's factory software and operating logic is maintained. This is particularly important for advanced hybrid units, where precise communication between the engine controller and other modules is crucial for the correct operation of the entire system.

Key Benefits of the Engine ECU Kit

Using this ECU kit in a Mercedes W205 C300De allows for the restoration of correct powertrain operation after an electronics failure or communication issues between controllers. The most significant benefits include:

• maintaining the factory performance characteristics of the hybrid diesel engine,
• seamless cooperation with the automatic transmission,
• integration with the vehicle's diagnostic systems,
• the possibility of correct adaptation and coding in a specialized service center.

For workshops and users, this means reduced risk of compatibility issues and stable engine unit operation after controller replacement.

Application in Diesel Powertrain with Automatic Transmission

The C300De diesel engine works with a complex control system that must simultaneously manage combustion parameters, torque, and interaction with the automatic gearbox. A properly selected engine ECU:

• coordinates gear changes with the current load on the engine unit,
• manages operating strategies in various driving modes,
• enables the correct operation of comfort functions and driver assistance systems.

This ensures the vehicle maintains proper dynamics, smooth operation, and predictable responses to driver commands, which is important for both daily use and intensive fleet operation.

Product Characteristics and Condition

The offered module belongs to the Electronic Control Modules and Controllers group and comes from a dismantled vehicle, which ensures compatibility with the original Mercedes installation. The product is classified as used, which in practice allows for cost optimization of repairs while maintaining the original manufacturer's specifications. Before installation, standard service procedures are recommended, such as diagnostics, potential programming, and adaptation to the specific vehicle.

Selection and Additional Technical Information

The engine ECU for the Mercedes W205 C300De has an assigned OEM part number and a set of interchangeable numbers, which facilitates unambiguous identification in service catalogs and parts selection systems. It is advisable to verify the module's compatibility with the specific vehicle configuration, considering the fuel type, transmission type, and equipment version. If necessary, you can use the manufacturer's designations, which are available in the product's technical specifications section.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as controllers, engine management modules, or powertrain control units, check the available parts in the Mercedes Electronic Control Modules and Controllers category.

Substantive Support and Knowledge about Used Parts

When selecting advanced engine electronics components, it is advisable to use reliable sources of knowledge about the quality and impact of used components on vehicle characteristics. A good reference point can be an article describing how original components help maintain the factory properties of a premium brand – you can find more on this topic in the post Audi and Pure Emotion. How Used Parts Help Maintain the Brand's DNA?.