Mercedes C219 CLS350 CDI OM642.920 Engine Module ECU A6421501230 Automatic

Mercedes C219 CLS350 CDI OM642.920 Engine Module ECU is a factory-original electronic control unit designed for OM642 diesel engines in the C219 body style equipped with an automatic transmission. This used engine controller from the Electronic control modules and controllers category allows for professional powertrain repair while maintaining original operating logic. It is a solution for users who expect stable engine performance, proper cooperation with the automatic transmission, and compatibility with Mercedes' factory electrical architecture.

Specifications and technical data

• SKU: A6421501230
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421501230
• Substitutable numbers: A6421501230, A 642 150 12 30, 0281015903, 0 281 015 903
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the controller

The engine ECU in this model is responsible for the precise control of the OM642 diesel unit, including fuel metering, boost pressure regulation, idle speed control, and interaction with the vehicle's onboard systems. Using a dedicated controller for the C219 body ensures proper communication with the electrical installation, comfort modules, and safety systems.

The controller is configured to work with an automatic transmission, which is crucial for smooth gear shifting, load response, and the correct operation of driving modes. As a result, the powertrain retains the characteristics intended by the manufacturer, and the vehicle responds predictably to driver inputs.

Benefits of using an original Mercedes ECU

Using an original engine controller in a Mercedes with an OM642 unit allows for maintaining consistency in software and operating parameters with the vehicle's other modules. This is particularly important in premium-class cars, where many systems are tightly integrated. By choosing this engine computer, you gain:

• preservation of the factory diesel engine performance characteristics,
• proper cooperation with the automatic transmission,
• compatibility with the electrical installation and controller network in the C219 model,
• the possibility of professional repair without interfering with the vehicle's construction.

A used control module is a sensible choice for repairs when the priority is combining quality with cost control, while maintaining the original electronic architecture of Mercedes.

Integration with the powertrain and vehicle electronics

The ECU for the OM642 engine in the C219 body is a central element of the entire powertrain control system. It works with engine sensors, modules responsible for the automatic transmission, as well as other controllers from the Electronic control modules and controllers group. A correctly selected engine computer minimizes the risk of communication errors in the vehicle network and diagnostic issues.

Before installation, it is recommended to verify compatibility with the specific car configuration and prepare for adaptation and programming according to Mercedes service procedures. This allows the controller to be correctly assigned to the vehicle, ensuring all functions related to the engine and automatic transmission operate as intended by the manufacturer.

Using a pre-owned controller in service and tuning

A used engine ECU is suitable both for standard replacement of a damaged module and for modernization projects where compatibility with the factory installation is key. In many cases, this allows for restoring full vehicle functionality without the need to purchase a new control unit, which is especially important given the rising costs of new components for premium cars.

For workshops specializing in the Mercedes brand, such a controller serves as a valuable base for further configuration, coding, and potential software modifications, while maintaining the safety of the diesel engine and automatic transmission operation.

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

For a broader perspective on repairing electronics in premium cars and the use of verified salvaged components, it is worth reading an article describing how to take care of systems and control modules in modern 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.

If you are interested in why used original control modules for premium brands like Mercedes are becoming an increasingly popular choice for repairs, also read our market analysis: Crisis in the new parts market? Why used originals for premium cars are the hottest trend in 2026.