Mercedes W221 OM642.930 235HP Engine Module Unit ECU Automatic A6421504772

Engine Control Module Mercedes W221 OM642.930 235 HP ECU for Automatic Transmission is a specialized component from the Electronic Control Modules and Controllers group, designed for precise management of the powertrain's operation. It is responsible for advanced control of diesel engine parameters, cooperation with the automatic transmission, and communication with other vehicle systems.

Specifications and technical data

• SKU: A6421504772
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421504772
• Substitutable numbers: A6421504772, A 642 150 47 72, 0281014337, 0 281 014 337
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and Function of the ECU Module

The presented engine controller is designed to work with the OM642.930 diesel engine with 235 HP in the S-Class W221 body. As the electronic brain of the powertrain, the ECU analyzes signals from sensors, controls fuel injection, boost pressure, and cooperation with the automatic transmission, ensuring stable engine operating characteristics and correct response to load.

Thanks to dedicated software, the module is optimized for the Diesel engine type and the automatic transmission configuration, which translates into smooth gear changes, predictable drive behavior, and proper cooperation with comfort and safety systems.

Benefits of Using an Original Mercedes Module

Choosing a controller from the Mercedes family of solutions helps maintain electronic consistency in the vehicle and reduces the risk of communication problems on the CAN bus. A properly selected ECU module:

• maintains the factory control maps for the OM642.930 engine,
• supports the correct operation of the automatic transmission under typical driving conditions,
• ensures compatibility with diagnostic systems used in service centers,
• facilitates subsequent calibration and potential software updates.

For the user, this means more predictable vehicle behavior, easier diagnostics, and a lower risk of conflicts between individual controllers in the vehicle network.

Technical Characteristics and Compatibility

The module belongs to the Electronic Control Modules and Controllers group and is designed for use in a Diesel fuel system, in an automatic transmission configuration. When selecting a controller, it is crucial to match it to the specific version of the OM642.930 engine and ensure hardware and software compatibility with the rest of the vehicle's installation, including the transmission module, immobilizer system, and other comfort controllers.

Due to the advanced electronic integration in the Mercedes S-Class W221, installation by a workshop with appropriate diagnostic equipment is recommended. This allows for correct coding, vehicle adaptation, and verification of communication with other modules after installation.

Condition, Origin, and Practical Application

The offered controller is a used part, which allows for economical repair of the injection and engine control system while maintaining the original electronic architecture. In many cases, this is a beneficial solution compared to aftermarket alternatives, especially in premium vehicles where compliance with the factory configuration is important.

The module is suitable for both a standard replacement of a damaged ECU and for a comprehensive overhaul of the powertrain after a failure. By maintaining the original specifications for diesel engine and automatic transmission control, it allows for the restoration of proper dynamics, smooth operation, and functionality of driver assistance systems.

Selection, Installation, and Expert Knowledge

Before purchasing, it is advisable to verify the controller's compatibility with the specific vehicle configuration using the VIN and OEM numbers. Correct selection based on engine version, fuel type, and transmission type minimizes the risk of startup problems and the need for additional installation modifications.

If you want to better understand how to safely choose used ECU modules, what to look for when matching by numbers, and how the adaptation process in a vehicle works, read the Global Parts guide: Used Automotive Electronics – Practical Guide to Second-Hand ECUs and Sensors.

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