Mercedes W470 X250D OM699.303 190HP Engine Module ECU Kit 237105JK8B Automatic

Mercedes W470 X250D OM699.303 190HP Engine Module ECU Kit is a professional electronic set designed for the OM699.303 diesel unit with 190 HP and an automatic transmission. Thanks to the factory system architecture and precise matching to the specific drivetrain configuration, it ensures stable diesel engine operation, proper communication with the automatic transmission, and consistency with the vehicle's other systems. This is a solution for users and workshops looking for an original control module set rather than universal replacements.

Specifications and technical data

• SKU: 237105JK8B-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: 237105JK8B
• Substitutable numbers: 237105JK8B, 237 105 JK8 B
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and system configuration

The presented control set is dedicated to Mercedes X-Class vehicles in the X250d version with the OM699.303 engine, working in conjunction with an automatic transmission. This configuration means that the ECU operating logic is adapted to the characteristics of the diesel unit and gear shift maps, which translates into predictable drivetrain response, correct torque management, and consistent operation of driver assistance systems.

As an item from the Electronic control modules and controllers group, this set is responsible for key processes: fuel dosing, boost pressure control, exhaust emission monitoring, and data exchange with other controllers in the vehicle network. Using a dedicated module instead of a random replacement limits the risk of CAN communication issues, diagnostic errors, and improper automatic transmission operation.

Technical characteristics and role in the drivetrain

The diesel engine in this configuration requires precise control of injection, fuel rail pressure, and auxiliary equipment, which is why a properly selected ECU module has a direct impact on the engine's refinement, fuel consumption, and acceleration dynamics. Cooperation with the automatic transmission also necessitates advanced exchange of information regarding load, engine speed, and current gear, which allows for smooth gear changes and reduces mechanical stress.

In practice, a correctly configured control set facilitates:

• maintaining stable diesel engine operating parameters across the full load range,
• preserving compliance with factory torque and power maps,
• proper cooperation with safety and comfort systems,
• efficient diagnostics using service testers.

Use of a used module and practical aspects

The offered set comes from the secondary market, which allows for economical repair or replacement of a damaged controller while maintaining the original system architecture. A used ECU module is often a reasonable compromise between cost and functionality, especially in vehicles used intensively or out of warranty. However, it is crucial to properly match the set to the specific engine and transmission version and to perform correct adaptation in the vehicle.

To better understand when choosing electronics from dismantling makes sense and what to pay attention to when selecting an engine controller, it is worth reading the guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?. The article discusses practical evaluation criteria, compatibility issues, and common mistakes made when purchasing used modules.

Integration with other modules and system expansion

In modern Mercedes vehicles, the engine controller does not work in isolation – it is part of an extensive network of controllers responsible for the drivetrain, safety, and comfort. Therefore, when replacing the ECU, it is important to maintain configuration consistency with other electronic components, such as modules responsible for the drivetrain, assistance systems, or traction control systems. A properly selected set makes it easier to maintain this consistency and reduces the need for deep programming interventions.

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 additional controllers, drivetrain management modules, or auxiliary controllers, check the available parts in the Electronic control modules and controllers Mercedes category.

Summary of benefits of using the ECU kit

The engine controller set designed for the Mercedes W470 X250d with the OM699.303 unit and automatic transmission is a solution that allows for restoring the proper operation of the drivetrain while maintaining factory control logic. Dedicated matching to the diesel engine and automatic transmission promotes parameter stability, and the use of an original module from the secondary market enables service cost optimization without sacrificing compatibility with vehicle systems. This is a practical choice for workshops specializing in the Mercedes brand and users who expect predictable operation of control electronics after a repair.