BMW 1 3 5 Series E60 E87 E90 120d 320d 520d M47N2 ECU Kit DDE 7801711 CAS2 + Key

BMW 1 3 5 Series E60 E87 E90 120d 320d 520d M47N2 ECU Kit DDE CAS2 + Key is a complete engine control unit kit for the M47N2 diesel engine, including the DDE module, CAS2 module, and a matched key. This package is particularly useful for professional engine control unit replacement in BMW 1, 3, and 5 Series models when maintaining the consistency of the electronics and immobilizer is required. Thanks to the factory configuration of the components, the kit allows for efficient repair of the control system without the need for tedious matching of individual components.

Specifications and technical data

• SKU: 7801711-4
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7801711
• Substitutable numbers: 13617798180, 7798180, 13617808125, 7808125, 13617799855 13617797497, 13617798187 13617803373, 7799855, 7797497 7798187 7803373, 13617805349 13617799317 13617801711, 13617797356, 7805349 7799317, 7801711 7797356, 13617795845, 13617797217 13617801216, 779
• Category: ECUs & Computer Modules

Purpose of the ECU DDE CAS2 + Key kit

The offered kit is dedicated to BMW 1, 3, and 5 Series vehicles with the M47N2 engine, particularly the popular 120d, 320d, and 520d versions. The set includes the DDE engine controller, the CAS2 module responsible for start authorization, and an electronic key paired with this set. This combination allows for the restoration of the vehicle's full security logic after a failure or damage to the original controller.

Structure and function of the kit components

The DDE module is responsible for precise control of the M47N2 diesel unit – fuel dosing, boost control, auxiliary equipment operation, and communication with other vehicle systems. The CAS2 module acts as the central element of the immobilizer system, managing key authorization, the start signal, and communication with other controllers in the vehicle network. The included key is factory-matched to this specific CAS2 module, which significantly facilitates installation and vehicle startup after replacing the electronics.

Application in BMW diagnostics and repairs

The complete ECU DDE kit with CAS2 and key is particularly useful in situations where:

• the original engine controller has suffered electrical or software damage,
• there are issues with the immobilizer and key authorization,
• it is necessary to replace the entire control package after a collision or water damage,
• advanced service work is being performed on the M47N2 engine electronics.

Because all key elements of the starting system are included in one package, diagnostic time and the risk of incompatibility between individual modules can be reduced.

Benefits of choosing a used OEM kit

The offered set comes from the Electronic control modules and controllers group, which means it is a solution consistent with BMW's factory architecture. Choosing a used OEM kit allows you to:

• maintain the original operating logic of the DDE controller and CAS2 module,
• minimize the need for additional programming compared to sourcing individual components,
• maintain communication consistency in the vehicle network (CAN, LIN) within the powertrain systems,
• reduce repair costs while maintaining high-quality components.

Used condition for BMW OEM electronics often means maintaining full functionality at a much more favorable price than new controllers.

Professional installation and vehicle integration

To fully utilize the potential of the DDE CAS2 + Key kit, installation in a specialized service center equipped with appropriate BMW diagnostic software is recommended. This allows for:

• verification of correct communication between modules after installation,
• adjustment of the configuration to the specific vehicle equipment version,
• checking and clearing any error codes stored in the controller's memory.

This approach ensures stable operation of the powertrain and proper functioning of the vehicle's security systems after replacing the electronics.

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 additional controllers, engine management modules, or powertrain control systems, check out the available parts in the BMW electronic control modules and controllers category.

To better plan your work on the electronics in your car and understand how to effectively use tested components from dismantling, it is worth reading the guide on our blog: Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 Series models.