Mercedes CL203 C350 M272.960 272HP Engine Unit ECU A2721535479 Automatic

Mercedes CL203 C350 M272.960 272HP Engine Unit ECU is a specialized electronic control module designed for a petrol engine paired with an automatic transmission. It is responsible for precise engine management, ensuring stable power characteristics, correct fuel dosing, and communication with other vehicle systems. Thanks to its OEM design, the module maintains the factory operating parameters of the powertrain and allows for a technically correct repair of the control system.

Specifications and technical data

• SKU: A2721535479
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2721535479
• Substitutable numbers: A2721535479, A 272 153 54 79, A0024467340, A 002 446 73 40, 0261209118, 0 261 209 118
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the control unit

The presented control unit is an item from the Electronic control modules and ECUs category, dedicated to the petrol engine in the Mercedes C-Class CL203 model in the C350 version with the M272.960 unit. The module manages key engine operating parameters, such as injection timing, ignition timing, auxiliary system operation, and cooperation with the automatic transmission, which translates into smooth acceleration and predictable throttle response.

Thanks to its factory architecture, the control unit works with the vehicle's CAN network, coordinating data exchange with other modules, such as safety, comfort, or powertrain management systems. A properly selected ECU module is essential to maintain powertrain electronics consistency and avoid communication issues between components.

Compatibility with petrol engine and automatic transmission

The module has been designed to work with a petrol unit, which means matched ignition and injection maps, cold-start characteristics, and support for specific sensors and actuators used in this type of engine. Using a control unit intended for the correct fuel type is crucial for maintaining proper exhaust emissions, smooth operation, and powertrain durability.

Another significant feature is its adaptation to the automatic transmission. The engine control unit exchanges information with the transmission control module, including torque, load, and rotational speed, which enables smooth gear shifts, reduces jerking, and supports the protection of drivetrain components. Proper ECU selection for an automatic transmission configuration minimizes the risk of errors, limp mode, or incorrect gear selection.

OEM characteristics and replacement numbers

As an OEM component, the control unit maintains the original manufacturer's specification, which facilitates diagnostics, programming, and adaptation in the vehicle. The module has an assigned part number and associated replacement numbers, allowing it to be precisely matched to a specific car configuration using manufacturer catalogs or professional selection tools. The presence of reference numbers allows for the safe use of interchangeable versions of the same control unit within the same engine family.

Before purchasing, it is recommended to compare the markings with the currently installed module and verify compatibility via the VIN number in the service documentation. This approach reduces the risk of software incompatibility, equipment differences, or market version discrepancies.

Condition, installation, and practical application

The offered control unit is a used item, which in practice means an attractive repair cost while maintaining the original design. The module, sourced from the dismantling of a factory Mercedes installation, allows for an economical restoration of the engine control system, especially in the event of electronics failure, damage due to flooding, or errors that cannot be cleared by standard diagnostics.

In most cases, installation requires performing programming or adaptation procedures in the vehicle, such as matching to the immobilizer, equipment configuration, or software updates. Installation by a workshop equipped with appropriate diagnostic tools for the Mercedes brand is recommended, which will ensure stable engine operation after the control unit replacement and correct saving of all parameters.

Expanding the control system in your Mercedes

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 control modules, auxiliary controllers, or electronic management units, check out the available parts in the Mercedes electronic control modules and ECUs category.

To compare how different manufacturers approach maintaining the brand's character and the role of original control modules in modern cars, it is worth reading the article on our blog: Audi and pure emotion. How do used parts help maintain the brand's DNA?. It provides a better understanding of why using the correct ECU modules is important for preserving the vehicle's factory properties.