BMW F80 Mechatronics Drive Control S55B30A S55 Petrol GS7D36SG 7850242 Automatic

BMW F80 Mechatronics Drive Control S55B30A S55 Petrol GS7D36SG Automatic is a specialized control module designed to work with the S55 petrol engine in BMW F-series models. This component is responsible for the precise management of the automatic transmission, ensuring smooth gear shifting and stable operation of the drivetrain. This solution is dedicated to users who expect consistent performance with the vehicle's factory electronics.

Specifications and technical data

• SKU: 7850242-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7850242
• Substitutable numbers: 28607850242, 7850242, GS7D36SG
• Fuel type: Petrol
• Gearbox type: Automatic
• Part type: Automatic Transmission
• Category: Automatic Transmission

Purpose and function of the BMW F80 mechatronics

The presented mechatronics unit is a component from the Automatic transmissions group, responsible for controlling the hydraulics and gear-shifting logic in the transmission paired with the S55B30A unit. It integrates an electronic system and a valve body, allowing for fast and repeatable responses to signals from engine sensors and driving assistance systems. As a result, the transmission can operate in various modes, maintaining appropriate performance standards during both calm and dynamic driving.

Benefits of using original mechatronics

Using a factory-original mechatronics unit in a BMW F80 with an S55 petrol engine ensures:

• preservation of the gear-shifting characteristics intended by the vehicle manufacturer,
• proper cooperation with engine control software and onboard systems,
• stable operating pressures in the transmission's hydraulic system,
• consistency of operating parameters with other drivetrain components.

For the user, this means predictable vehicle behavior, a reduced risk of incorrect gear shifts, and the ability to perform further diagnostics based on standard BMW service procedures.

Technical characteristics and compatibility

The mechatronics unit has been designed to work with the GS7D36SG automatic transmission in a configuration with the S55 petrol engine. The module's design accounts for the specific loads resulting from the high torque of the S55B30A unit, which translates into appropriately selected gear-shift maps and valve operating logic. This component is intended for integration with the factory wiring harness and vehicle control system, without the need for additional installation modifications.

Condition, verification, and service application

The offered mechatronics unit comes from the used parts segment, which allows for an economical repair of the drivetrain while maintaining factory specifications. This type of component is particularly useful in situations where symptoms such as jerking during gear changes, delayed gear engagement, or transmission control unit errors occur. Replacing the mechatronics with a functional module allows for the restoration of proper transmission operation without the need to interfere with the mechanics of the entire gearbox.

BMW automatic transmissions – further expansion and technical knowledge

If you are planning a comprehensive repair or upgrade of the drivetrain area in your BMW and need other elements from the same group, such as transmission housings, torque converters, or control modules, check the available parts in the BMW automatic transmissions category.

To deepen your knowledge regarding the selection and diagnostics of transmissions, it is worth reading the guide describing the differences between manual, automatic, and DSG gearboxes, typical failure symptoms, and criteria for choosing used components – this is discussed in detail in the article Transmission: manual, automatic, or DSG – typical failures and a guide to buying a used gearbox.

If you are considering a choice between a used original part and a replacement, the material explaining the practical advantages of factory components may also be helpful – you will find it in the article 5 reasons why a used OEM part is a better choice than a replacement.