BMW F40 F44 M135i M235i xDrive B48 306HP Engine Module ECU DME 5A45F57 Automatic

The BMW F40 F44 M135i M235i xDrive B48 306HP Engine Module ECU DME is an original engine control unit designed for BMW vehicles with xDrive and automatic transmission. This item from the Electronic Control Modules and Controllers group is responsible for precise management of the 306 HP B48 engine. The used control unit ensures factory control logic, maintaining the characteristic performance typical of the M135i and M235i sport versions.

Specifications and technical data

• SKU: 5A45F57
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 5A45F57
• Substitutable numbers: 5A45F57, 0261S105M9, 0 261 S10 5M9
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Intended Use and Function of the Engine Controller

This ECU DME module is specifically designed to work with the four-cylinder B48 gasoline engine producing 306 HP in BMW F40 and F44 models, specifically the M135i and M235i xDrive versions. It is responsible for comprehensive control of the combustion process, fuel delivery, ignition, turbocharger operation, and communication with other vehicle systems, such as safety systems or the all-wheel drive.

Thanks to its factory software architecture, the controller maintains the correct operating parameters of the powertrain, which translates into stable power, predictable throttle response, and consistency with the car's other electronic systems.

Integration with Automatic Transmission and xDrive

The presented controller is configured to work with an automatic transmission, which is crucial for proper data exchange between the engine and the gearbox. The ECU coordinates engine torque during gear changes, supports smooth transmission operation, and stability of the xDrive system under various road conditions.

Proper integration of the module with the drivetrain allows for the retention of factory shifting strategies, traction control, and acceleration characteristics, which is particularly important in powerful M Performance versions.

Benefits of Using an Original ECU DME Module

Using an original engine controller in the BMW F40/F44 M135i/M235i xDrive offers a number of practical benefits:

• maintaining the factory operating characteristics of the B48 306 HP unit,
• consistency with the vehicle's existing electronic architecture,
• proper cooperation with the automatic transmission and xDrive system,
• possibility of further diagnostics and servicing based on standard BMW procedures.

As an item from the Electronic Control Modules and Controllers category, this controller is an important component of the powertrain, influencing engine smoothness, fuel consumption, and the stability of the entire system.

Characteristics of a Used Product

The offered ECU DME module is a used item, which means it comes from a dismantled vehicle and has been previously operated. This type of solution is often chosen as a technically sound alternative to new components, allowing for reduced repair costs while maintaining the original manufacturer's specifications.

To better understand how to safely select and install used engine control units and other electronic components, it is worth reading the Global Parts guide: Used Automotive Electronics Onboard – Why Choose Second-Hand ECU Modules and Sensors?. The article discusses, among other things, selection by OEM numbers, compatibility issues, and practical installation tips.

Selection and Other BMW Modules in the Same Group

When replacing the engine controller in sport BMW F40/F44 models, it is worth considering the entire powertrain and control electronics area. If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other parts from the same group, such as engine controllers, drive management modules, or auxiliary system controllers, check the available parts in the BMW Electronic Control Modules and Controllers category.