Mercedes X118 W177 W247 CLA 220 654.920 190HP Engine ECU A6549009600 Automatic

Mercedes X118 W177 W247 CLA 220 654.920 190HP Engine ECU is an advanced electronic control unit designed for the 654.920 powertrain with 190 HP, paired with an automatic transmission. This is an original engine computer from the Mercedes group, dedicated to petrol-powered vehicles, ensuring precise management of the engine's operation and key onboard systems.

Specifications and technical data

• SKU: A6549009600-4
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6549009600
• Substitutable numbers: A6549009600, A 654 900 96 00, A6549017600, A 654 901 76 00, 0281037274, 0 281 037 274
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the engine ECU

The presented controller is an item from the Electronic control modules and ECUs category, designed to support the petrol engine in Mercedes CLA 220 models of the X118, W177, and W247 series. The module is responsible for controlling fuel injection, ignition, engine auxiliary components, and communication with the automatic transmission, which translates into stable power characteristics, smooth acceleration, and optimized fuel consumption.

Thanks to its factory architecture, the controller communicates with other vehicle systems (e.g., the CAN bus), enabling the proper functioning of safety and comfort features. This solution is particularly important when repairing the 654.920 unit, where hardware and software compatibility with the original vehicle configuration is required.

Compatibility with the 654.920 engine and automatic transmission

The controller has been developed to work with the 654.920 190 HP petrol engine in a configuration with an automatic transmission. This means that the control logic accounts for:

• coordination of engine torque with the operation of the automatic transmission,
• management of gear shifts depending on load and driving mode,
• support for engine and transmission protection strategies under adverse operating conditions.

Such matching allows for maintaining the factory driving characteristics of the CLA 220, including refinement, dynamics, and predictable drivetrain responses to driver input.

Application in Mercedes CLA 220 models

The Mercedes X118 W177 W247 CLA 220 654.920 190HP Engine ECU utilizes advanced control electronics, in which the engine computer plays a central role. Using an original module from the same family allows for:

• maintaining compatibility with the vehicle's factory software,
• easier adaptation during programming and coding at a service center,
• reducing the risk of communication errors with other controllers in the vehicle.

This solution is especially recommended when replacing a damaged ECU following an electrical failure, water damage, or an unsuccessful electronic tuning attempt.

Characteristics of the used product

The offered controller is a used item, sourced from dismantling, which provides an attractive cost alternative compared to new components. Such modules are frequently chosen by workshops specializing in the Mercedes brand and by informed users who are looking for solutions that allow for lower repair costs while maintaining the original technical specifications. Before installation, a standard diagnostic procedure and preparation for adaptation in the vehicle (programming, potential matching to the immobilizer according to service procedures) are recommended.

Support with selection and additional information

When selecting a controller for a specific CLA 220 unit, it is crucial to compare the OEM part number and interchangeable numbers with the vehicle's specifications – all this data can be found in the technical specifications section. In case of doubt, it is worth consulting an automotive electrician or a service center specializing in Mercedes electronics to ensure proper fitment and subsequent module coding.

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 engine controllers, transmission management modules, or other onboard computers, check the available parts in the Mercedes electronic control modules and ECUs category.

For a better understanding of how modern electronic modules work and the procedures for their replacement and adaptation, it is worth reading an article describing a practical approach to repairing controllers and multimedia systems in premium class vehicles – you can find it here: Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models.