Mercedes W639 111CDI OM646 109HP Engine Control ECU Kit A6461508391 Automatic

Mercedes W639 111CDI OM646 109HP Engine Control Unit Kit A6461508391 Automatic is a complete control set designed for the OM646 unit with 109 HP, compatible with an automatic transmission. Using an original module from this series ensures stable engine operation, correct communication with other vehicle systems, and consistency with the factory electronics architecture. This is a solution for users who want to restore the drivetrain's functionality in their Mercedes W639 in a technically correct manner.

Specifications and technical data

• SKU: A6461508391-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6461508391
• Substitutable numbers: A6461508391, A 646 150 83 91, 0281012834, 0 281 012 834, A6395450508, A 639 545 05 08
• Gearbox type: Automatic
• Part type: Engine Control Unit (ECU)
• Category: ECUs & Computer Modules

ECU Purpose and Function

The presented control set is responsible for managing the operation of the OM646 111CDI diesel engine with 109 HP. The module coordinates, among other things, fuel delivery, boost parameters, and cooperation with the automatic transmission, which translates into smooth acceleration and predictable throttle response. Thanks to its adaptation to the specific W639 drivetrain configuration, the ECU maintains compatibility with the engine's factory operating maps.

Compatibility with Automatic Transmission

This ECU is configured to work with an automatic transmission, which is crucial for correct gear selection and driving comfort. Proper communication between the engine module and the automatic gearbox affects:

• correct gear shift points under various loads,
• stable idle RPM when starting and stopping,
• improved drivetrain refinement in city and highway driving.

With this kit, you can restore the drivetrain's factory performance, which is particularly important for vehicles used for professional purposes.

Product Characteristics and Build Quality

The ECU comes from the line of original solutions used by Mercedes, meaning it maintains the correct hardware architecture and software tailored to the OM646 engine. As an item in the Electronic Control Modules and ECUs category, it is designed to operate in the demanding thermal and vibration conditions of the engine bay. The used nature of the part allows for an economical restoration of vehicle functionality while maintaining compliance with factory specifications.

Benefits of Using an Original ECU Kit

Using this kit in a Mercedes W639 111CDI offers a range of practical benefits:

• Compatibility with the electrical system – the module is prepared to work with the vehicle's original wiring harness, without the need for modifications.
• Appropriate engine maps – tailored to the 109 HP OM646 unit, which reduces the risk of errors and unstable operation.
• Correct cooperation with the automatic transmission – maintaining the manufacturer's intended gear shifting strategies.
• Possibility of professional adaptation and coding by a specialized service center, in accordance with manufacturer procedures.

Practical Application and Technical Support

This ECU kit is suitable for both standard replacement of a damaged module and comprehensive drivetrain repair in a Mercedes W639. Installation in a specialized workshop is recommended, equipped with the appropriate diagnostic software for ECU adaptation and verification of communication with other vehicle systems. In our offer, you will also find other automotive electronics components, available in the section discover the differences in advanced drivetrains and select the right modules for your car, which facilitates part selection for specific applications.

For users interested in the broader context of using original electronic modules in premium cars, we recommend the article how original used modules and components help maintain brand character and factory driving quality, where we discuss the importance of proper part selection in modern designs.