BMW E90 E91 E92 330d M57N2 231HP Engine ECU KIT DDE 7809944 CAS + Key Automatic

BMW E90 E91 E92 330d M57N2 231HP Engine ECU KIT DDE CAS + Key Automatic is a solution designed for vehicles equipped with an automatic transmission. The kit ensures the consistency of the powertrain electronics and the immobilizer, which facilitates professional repair or replacement of a damaged ECU in BMW cars with a 3.0d 231HP engine.

Specifications and technical data

• SKU: 7809944-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7809944
• Substitutable numbers: 13617810950, 7810950, 13617806378 13617810077 13617806976, 7806378 7810077 7806976, 13617809944 13617808205 13617811957, 7809944 7808205 7811957, 13617809784, 7809784, 61359147195, 9147195, 0281015129, 0 281 015 129
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU DDE + CAS + Key kit

The offered BMW E90 E91 E92 330d M57N2 231HP Engine ECU KIT DDE CAS + Key Automatic is a component from the Electronic control modules and ECUs category, responsible for managing diesel engine operation and start authorization. Combining the engine ECU with a matched CAS module and key minimizes the risk of immobilizer synchronization issues, which is particularly important when replacing electronics in modern BMW powertrains.

The kit is dedicated to BMW 3 Series E90, E91, and E92 generation vehicles with the 330d M57N2 231HP engine, paired with an automatic transmission. As such, it provides a cohesive package for workshops specializing in the BMW brand and for users looking for a complete solution rather than a single ECU.

Benefits of using a complete DDE with CAS kit

Using a complete engine ECU kit with a CAS module and key in a BMW 330d M57N2 brings a number of practical benefits to the repair process:

• reduced risk of conflicts between the engine ECU and the immobilizer,
• easier configuration of powertrain electronics after installation,
• consistency of components originating from a single system,
• possibility of faster diagnostics and vehicle startup after replacement.

For workshops dealing with BMW electronics, this means a more predictable service process, and for the end user – a greater chance of successfully restoring full vehicle functionality without the need for deep software intervention.

Compatibility with automatic transmission

The presented kit is configured to work with an automatic transmission in the BMW 3 Series E90/E91/E92 330d M57N2. This is significant both for torque control logic and for bus communication with the transmission module. Choosing an ECU intended for the automatic version reduces the risk of errors related to incorrect software selection and powertrain operating parameters.

This makes the kit particularly useful in situations where the original ECU in a vehicle with an automatic transmission has been damaged and it is necessary to use a component with the correct configuration.

Product characteristics and practical application

The offered item is a BMW brand product from the Electronic control modules and ECUs group, sourced from dismantling, which allows for economical vehicle repair while maintaining the original electronic architecture. The BMW E90 E91 E92 330d M57N2 231HP Engine ECU KIT DDE CAS + Key Automatic is particularly recommended in the case of:

• engine ECU damage resulting from power surges or water ingress,
• communication problems between the ECU and the CAS module,
• the need to replace the entire set of powertrain electronics after a major failure.

By choosing such a package, the workshop receives a base for further vehicle configuration, with the ability to adjust operating parameters to the specific vehicle specification using appropriate diagnostic tools.

Expert support and selection of used electronics

When selecting used engine ECUs, comfort modules, or parking sensors, it is worth following proven procedures and practical knowledge. To better understand when used electronics are a reasonable choice and what to look for when purchasing, check out our guide: Second life for electronics – when is it worth choosing used engine ECUs, comfort modules, and parking sensors?

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as engine ECUs, powertrain management modules, or injection control systems, check out the available parts in the BMW Electronic control modules and ECUs category.