Mercedes W205 C300 OM264.920 Engine Control Module ECU A2649000700 Automatic

The Mercedes W205 C 300 OM264.920 258HP Engine Computer ECU A2649000700 is a specialized control unit designed for a gasoline engine paired with an automatic transmission. This component, belonging to the electronic control modules and controllers group, is responsible for precise engine management, ensuring stable parameters and proper interaction with other vehicle systems. A used control unit is a sensible choice for users seeking a proven solution at an attractive price.

Specifications and technical data

• SKU: A2649000700-3
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2649000700
• Substitutable numbers: A2649000700, A 264 900 07 00, A2649011900, A 264 901 19 00, 0261S20343, 0 261 S20 343
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and Function of the Engine Controller

The presented engine computer is designed to work with the gasoline engine in the Mercedes C-Class W205 generation, specifically the C 300 version with the OM264.920 engine producing 258 HP. The controller manages key engine operating parameters such as fuel injection quantity, ignition timing, and operating strategy under various load conditions, as well as coordinating communication with the automatic transmission.

Thanks to this module, the powertrain can maintain stable performance, smooth operation, and predictable throttle response. A correctly selected ECU is essential for preserving the vehicle's full functionality after mechanical or electrical repairs.

Benefits of Using a Used ECU

Choosing a used engine computer for the Mercedes W205 C 300 can significantly reduce repair costs while maintaining the original control system architecture. The module comes from the factory production line, which promotes proper compatibility with the electrical system, engine wiring harness, and other control units in the vehicle.

The main advantages of this solution include:

• maintaining the factory control logic for the engine and automatic transmission,
• compatibility based on OEM numbers and interchangeable part numbers,
• reduced risk of communication issues within the CAN network by using a module from the same controller family,
• an attractive cost-to-functionality ratio compared to new components.

For users considering installing a used control module, the following guide will be useful: find out how to safely select and install a used ECU and other engine electronics components.

Compatibility, Selection, and Vehicle Integration

For the engine computer to function correctly, it is crucial to match it to the specific vehicle configuration, including fuel type and transmission type. In this case, the controller is designed for a gasoline engine paired with an automatic transmission, which is important for torque control maps, gear shifting strategies, and interaction with safety systems.

When selecting a module, it is worth paying attention to:

• compatibility with the specific OM264.920 engine version,
• alignment with the drivetrain configuration (gasoline + automatic),
• the possibility of adaptation and coding in the vehicle using appropriate diagnostic equipment.

A correctly selected and configured ECU minimizes the risk of control errors, starting problems, or improper functioning of comfort features and driving assistants.

Application in the Powertrain and Operation

In the Mercedes W205 C 300 powertrain, the engine computer acts as the central decision-making element, determining optimal engine operating parameters based on data from sensors and collaborating modules. This directly impacts dynamics, fuel consumption, and stable operation across the entire RPM range.

In the case of modifications or repairs to fuel system components, such as injectors or the fuel pump, a properly functioning ECU is essential for maintaining correct adjustments and adaptations. Additional information on fuel system operation and servicing can be found in the material: see the guide on diagnosing and repairing fuel system components.

Summary

The Mercedes W205 C 300 OM264.920 258HP Engine Computer ECU A2649000700 is an original control module designed for a gasoline engine paired with an automatic transmission. A used controller is a practical solution for users seeking a factory-compatible engine electronics component that will restore proper powertrain operation without the need to invest in a new part.