Mercedes W907 315CDI OM654.920 Engine Unit Module ECU Kit A6549009400 BCM + Key

Mercedes W907 315CDI OM654.920 Engine Unit Module ECU Kit BCM + Key is a complete electronic set designed for advanced powertrain control in Mercedes vehicles equipped with a diesel engine and an automatic transmission. The combination of the ECU, BCM module, and a matched key ensures system consistency for the immobilizer and seamless integration with the vehicle's factory wiring. This solution allows for professional repair of the engine control system without the need for costly programming from scratch.

Specifications and technical data

• SKU: A6549009400-3
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6549009400
• Substitutable numbers: A6549009400, A 654 900 94 00, A6549017600, A 654 901 76 00, 0281037185, 0 281 037 185, A 447 900 96 09, A2479001709, A 247 900 17 09, A9079009205, A 907 900 92 05
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU + BCM + key kit

The offered kit belongs to the Electronic control modules and controllers category and is dedicated to Mercedes W907 series vehicles with the 315CDI OM654.920 diesel engine and automatic transmission. The set includes the ECU, the BCM body module, and the key, which enables compatibility between the controller, immobilizer, and comfort system.

A kit configured in this way is particularly useful in situations where the original engine controller has been damaged or there are communication issues between modules. Using a matched set minimizes the risk of software conflicts and facilitates the restoration of full powertrain functionality.

Benefits of using an original Mercedes control module

Choosing an original control module from a disassembly is a solution that allows you to maintain the factory performance characteristics of the diesel engine and proper cooperation with the automatic transmission. The ECU in this kit is designed for precise management of injection, turbocharging, starting strategies, and engine protection, while the BCM is responsible for coordinating various body functions and security features.

With this kit, you can:

• restore proper CAN bus communication between the engine, transmission, and comfort modules,
• maintain operating parameters consistent with the manufacturer's factory settings,
• reduce diagnostic and configuration time after replacing a damaged controller.

Application in vehicles with diesel engines and automatic transmissions

The ECU, BCM, and key kit has been prepared for diesel vehicles where precise control of fuel dosage, boost pressure, and exhaust emission systems is crucial. At the same time, it is adapted to work with an automatic transmission, which requires strict synchronization between the engine controller and the module responsible for gear shifting.

This combination allows for smooth acceleration, stable idle operation, and proper functioning of additional features, such as drive modes or driver assistance systems. The kit is suitable for both repairs after electronic failure and for replacing a damaged set after a collision.

Characteristics of the used product

The offered set comes from a disassembly and is a used product, which provides a favorable compromise between repair costs and maintaining the manufacturer's original quality. In practice, this means the ability to restore the efficiency of the engine control system at a significantly lower financial outlay than purchasing a brand-new set.

When choosing a used control module, it is worth paying attention to compatibility with the specific engine version and transmission type – this kit is prepared specifically for the diesel configuration with an automatic transmission, which makes it easier to select the right part for a specific vehicle.

Technical support and additional information

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, comfort modules, or ECU units, check the available parts in the Mercedes electronic control modules and controllers category.

For users interested in a broader context of automotive electronics repair, including engine controllers and comfort modules, an article describing work with used controllers in other premium brands may be helpful – especially in the context of diagnostics and programming. You can find more practical tips in the material: Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models.

If you want to learn more about the specifics of purchasing parts from disassembly, the rules for selecting them, and how to verify their technical condition, it is worth reading the guide: Used parts – your guide to the best offers in the automotive store, which will help you consciously choose used electronic modules for your Mercedes.