BMW E60 E90 E91 N52 325i 525i 218HP Engine Control Unit ECU DME 7555361 Automatic

BMW E60 E90 E91 N52 325i 525i 218HP Engine Control Unit ECU DME is a factory module from the Electronic control modules and controllers group, designed to manage the operation of the powertrain in BMW models equipped with the N52 engine and an automatic transmission. The controller is responsible for precise fuel metering, ignition timing, and communication with other vehicle systems, ensuring stable and predictable engine performance. This used OEM component is a sensible choice for professional repairs or replacing a faulty DME in BMW 3 Series E90 325i vehicles.

Specifications and technical data

• SKU: 7555361-4
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7555361
• Substitutable numbers: 12147577970, 7577970, 12147555361, 7555361, 5WK90078, KZ
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Function and role of the DME engine controller in the BMW E90 N52 325i

The engine controller in BMW vehicles with the N52 unit plays a key role in managing the entire combustion process and communication with other vehicle modules. It is responsible for, among other things:

• controlling fuel dosage and injection timing under various load conditions,
• managing ignition timing based on engine speed and load,
• cooperating with safety and comfort systems (e.g., traction control system, automatic transmission, cooling system),
• diagnosing faults and storing error codes in the ECU memory.

Thanks to this, the BMW E60 E90 E91 N52 325i 525i 218HP Engine Control Unit ECU DME allows for maintaining proper engine operating parameters, which translates into smooth operation, performance, and fuel efficiency.

Compatibility and selection based on OEM / replacement numbers

Selecting a DME controller for a BMW requires attention to the manufacturer's markings and hardware/software compatibility with the specific engine version and equipment. This controller model has a dedicated OEM part number and associated interchangeable numbers, which facilitates matching it to a specific vehicle.

To ensure proper system operation, it is recommended to:

• verify the OEM number and reference numbers before purchase,
• check compatibility with the N52 engine type in the 325i version,
• take into account the vehicle configuration with an automatic transmission.

In case of doubt, it is worth using the VIN-based selection or consulting an automotive electrician to ensure the controller is fully compatible with the vehicle's electrical system.

Integration with automatic transmission

The presented controller is designed to work with an automatic transmission, which is significant for torque management logic and gear-shifting strategies. The DME module communicates with the transmission control unit, including in the areas of:

• limiting torque during gear changes,
• controlling engine speed during acceleration and downshifts,
• coordinating operation with electronic stability control systems.

A properly selected engine controller for an automatic version helps avoid jerking, incorrect gear shifts, and communication errors between modules.

Characteristics of the used controller and installation recommendations

The offered module comes from the secondary market, which allows for significantly reducing repair costs compared to a new OEM component, while maintaining factory design and fitment for BMW installations. A used engine controller is a good solution in situations where:

• the original DME has suffered electronic or thermal damage,
• the vehicle requires a controller replacement after water damage or a short circuit in the installation,
• it is necessary to replace the module as part of a broader powertrain repair.

Before installation, one should account for potential adaptation, coding, or cloning of immobilizer data in accordance with BMW procedures. These tasks should be performed by a specialized workshop with appropriate diagnostic software.

Expert support – how to safely buy used BMW electronics

If you want to better understand how to properly select an engine controller, what to look for when buying a used ECU, and how hardware and software compatibility works, check out the Global Parts guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?. You will find practical tips on selection by VIN/OEM, installation, and the most frequently asked questions related to dismantled electronics.

Additionally, if you are interested in how to take care of the durability of secondary market components, it is worth reading the article How to extend the life of used car parts?, which describes proven methods for the operation and maintenance of electronics and mechanical subassemblies.

Related BMW Electronic control modules and controllers

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 control modules, auxiliary controllers, or additional ECU units, check out the available parts in the BMW Electronic control modules and controllers category.