Mercedes W212 E350 CDI OM642.850 231HP Engine Control ECU A6429001300 Automatic

Mercedes W212 E350 CDI OM642.850 231HP Engine Control ECU is an advanced electronic module designed for a diesel unit paired with an automatic transmission. It is responsible for precise management of the diesel engine's operation, ensuring stable power characteristics, fuel injection control, and seamless integration with other vehicle systems. This solution is dedicated to drivers who expect efficient performance of the drivetrain, consistent with factory specifications.

Specifications and technical data

• SKU: A6429001300
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6429001300
• Substitutable numbers: A6429001300, A 642 900 13 00, A0064465940, A 006 446 59 40, 0281016224, 0 281 016 224
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU

The presented module belongs to the Electronic control modules and ECUs category and was designed specifically for use with the diesel engine in the Mercedes E-Class W212 generation, E350 CDI version. The ECU manages key operating parameters of the OM642.850 unit, such as fuel dosage, boost pressure, and injector correction, while also coordinating communication with the automatic transmission, diagnostic system, and other vehicle modules.

Thanks to the factory electronics architecture, the ECU ensures consistency with the original vehicle software, which translates into predictable engine behavior, correct throttle response, and stable operation across the full load range. This is particularly important for diesel units, where control precision has a direct impact on refinement and fuel consumption.

Compatibility with diesel engine and automatic transmission

The ECU has been configured to support a diesel engine, which means adapting injection maps, fuel pressure, and turbocharger operating strategies to the specifics of the CDI unit. The applied control algorithms take into account the torque characteristics typical of diesel engines, supporting smooth acceleration and efficient use of available power.

At the same time, the module is designed to work with an automatic transmission, which is crucial for smooth gear shifting and torque coordination during gear changes. A properly selected engine control unit allows for maintaining factory gear-shifting strategies, reducing jerking, and ensuring harmonious drivetrain operation in daily use.

Benefits of using an original ECU

Using an original ECU module in a Mercedes W212 E350 CDI offers a number of practical benefits:

• preservation of factory engine and automatic transmission operating parameters,
• consistency with the vehicle's diagnostic system and accurate error readings,
• proper fitment for the electrical installation and CAN bus architecture,
• possibility of further service maintenance in accordance with manufacturer procedures.

A used ECU from this series is a sensible choice for repairs when the existing module has suffered electronic or software damage, and the goal is to restore the proper operation of the powertrain without interfering with the vehicle's construction.

Application in service practice

Replacing the ECU in a Mercedes E-Class with an OM642.850 engine is often part of a broader powertrain diagnostic process. In workshop practice, such a module is used, among other things, for issues with starting, unstable idle, power loss, or communication errors with other controllers. A properly selected and prepared ECU allows for restoring correct engine operation while maintaining the manufacturer's original parameters.

Due to the specifics of vehicle electronics, the installation of the ECU should be combined with professional adaptation and potential programming according to the requirements of the specific vehicle. This helps avoid conflicts within the vehicle's network and ensures full functionality of driver assistance systems.

More about used electronics and related components

If you are considering installing a used ECU module and want to take a conscious approach to the topic of regeneration and selection of electronics, it is worth reading practical tips on controllers, comfort modules, and sensors – you will find them in the article The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?. This is a helpful source of knowledge when planning repairs in modern cars.

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, powertrain management modules, or electronic parameter control systems, check out the available parts in the Electronic control modules and ECUs Mercedes category.