BMW E60 E87 E90 120d 320d 520d M47N2 ECU Control Unit Kit DDE 7801711 CAS2 Key

BMW E60 E87 E90 120d 320d 520d M47N2 ECU Control Unit Kit DDE CAS2 Key is a complete, used electronic set designed for BMW powertrains with the M47N2 engine. It includes the DDE engine control unit along with the CAS2 module and key, which facilitates restoring the proper operation of the powertrain and immobilizer system in a way that is technically consistent with the factory configuration. This solution is particularly useful when replacing a damaged control unit or resolving start authorization issues.

Specifications and technical data

• SKU: 7801711-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7801711
• Substitutable numbers: 13617808125, 7808125, 13617797497, 7797497, 13617798187, 7798187, 13617803373, 7803373, 13617805349, 7805349, 13617799317, 7799317, 13617801711, 13617797356, 13617795845, 13617797217, 13617799855, 13617798180, 13617801216, 0281013251, 0 281 013 251, 61356943791, 6943791
• Category: ECUs & Computer Modules

Purpose and function of the DDE with CAS2 kit

The presented kit belongs to the Electronic control modules and ECUs category and is dedicated to BMW 3, 5, and 1 series models equipped with the M47N2 engine. Combining the DDE control unit with the CAS2 module and a matched key allows for maintaining the integrity of the security system, which is crucial for proper starting, stable engine operation, and communication with other modules in the vehicle. In practice, this means the possibility of a technically correct replacement of a damaged engine control unit without the need for time-consuming matching of individual start/stop system components, which is particularly important in modern BMW electronic systems.

Advantages of using an original BMW control unit

The original DDE module integrated with CAS2 provides:

• factory logic for controlling the M47N2 diesel engine,
• proper cooperation with the vehicle's electrical installation and communication bus,
• maintenance of security functions related to the immobilizer and key authorization,
• diagnostic capability using standard BMW service tools. Thanks to this, the kit is a practical solution in the event of a control unit failure, DDE–CAS communication problems, or start-related errors, reducing the risk of incompatibility typical of low-quality replacements.

Interchangeable numbers and vehicle compatibility

The control unit included in the kit has an assigned OEM part number and a wide list of interchangeable numbers, which increases the range of compatibility within the M47N2 engine range in BMW 1, 3, and 5 series. Before purchasing, it is worth verifying compatibility with your vehicle based on the control unit number and engine configuration to ensure all functions operate correctly. The presence of multiple reference numbers facilitates the selection of the appropriate module in case of upgrades or replacement of powertrain components, and also allows for the effective use of dismantled parts in professional workshops.

Condition, origin, and service application

The kit is used, meaning it comes from a dismantled BMW vehicle and has been designated for reinstallation after proper verification. Such components are frequently used in workshops specializing in the BMW brand, where maintaining the original electronic architecture while optimizing repair costs is a priority. In practice, the DDE with CAS2 and key kit will prove useful for:

• replacing a damaged engine control unit in vehicles with M47N2,
• resolving issues with the immobilizer and lack of key authorization,
• restoring electronic configuration after major installation damage.

Technical support and additional information

For users and workshops that want to better understand the operating principles of BMW electronic modules and the possibilities of using dismantled parts, an article describing the practical aspects of repairing control systems will be useful. More information can be found in the material: Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models using dismantled parts? 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 control units, comfort modules, or transmission control units, check the available parts in the BMW electronic control modules and ECUs category.