BMW E87 E90 LCI 118d 318d N47 Diesel ECU KIT DDE 7811701 + CAS3 + Key Automatic

BMW E87 E90 LCI 118d 318d N47 Diesel ECU KIT DDE + CAS3 + Key Automatic is a complete electronic set designed for BMW diesel systems with the N47 engine and automatic transmission. The set includes the DDE engine control unit, the CAS3 module, and a matched key, allowing for a consistent, professional replacement of the powertrain electronics. This is a practical solution for ECU failure, immobilizer issues, or the need to swap the entire control system.

Specifications and technical data

• SKU: 7811701-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7811701
• Substitutable numbers: 13618506281, 8506281, 13617812501, 7812501, 13617810001, 7810001, 13617811701, 7811701, 13617807143, 7807143, 13617807204, 7807204, 13617812001, 13617809001, 13617807828, 13617807529, 13618508712, 13617808403, 13617806700, 0281015042, 61359147220, 9147220
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU KIT DDE + CAS3 + Key

The presented set belongs to the Electronic control modules and ECUs group and is dedicated to BMW vehicles with the N47 diesel engine and automatic transmission. Combining the DDE engine controller with the CAS3 module and a paired key ensures the consistency of immobilizer data, which significantly facilitates restoring full functionality to the powertrain after the original electronics have been damaged. A set configured in this way is particularly useful for:

• replacing a damaged engine controller in diesel units,
• key authorization issues and communication problems with the CAS3 module,
• powertrain swaps between compatible BMW models with automatic transmissions.

Benefits of using a complete set of controllers

Using a complete ECU KIT with DDE, CAS3, and a key limits the need for programming from scratch and reduces the risk of conflicts between individual modules. From a workshop perspective, this means:

• a more predictable installation and configuration process,
• easier diagnostics in the event of previous immobilizer problems,
• data consistency within the starting and engine control system. For the end user, this translates into faster vehicle recovery and stable operation of the diesel unit working with an automatic transmission. The complete powertrain electronics set is also a convenient solution for post-accident repairs or after the factory controller has been flooded.

Technical characteristics and compatibility

The offered set is intended for diesel-powered vehicles equipped with an automatic transmission and DDE engine management. Combining these features makes the set well-suited to the requirements of modern BMW diesel systems, where proper cooperation between the controller, the start comfort module, and the security system is crucial. As an original BMW electronic component, the set maintains the factory vehicle communication architecture, which facilitates integration with the existing installation and cooperation with factory diagnostic tools. The consistency of the engine controller with the CAS3 module minimizes the need for deep software interference during installation.

Condition, workshop application, and selection of used electronics

The product is offered as a used item, making it an attractive cost-effective alternative to new components while maintaining the manufacturer's original specifications. This type of solution is often chosen by professional services specializing in the BMW brand, especially when repairing older model generations where the availability of new controllers may be limited. If you want to better understand when choosing a used engine controller, comfort module, or sensors is justified, it is worth reading the guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?. There, you will find practical tips on selecting and verifying automotive electronics from the secondary market.

Expanding repairs in the area of BMW electronics

If you are planning a comprehensive repair or upgrade of the control electronics in your BMW and need other elements from the same group, such as additional controllers, body modules, or engine management systems, check the available parts in the BMW Electronic control modules and ECUs category.