BMW i3 I01 LCI Rex 94Ah Hybrid ECU Engine Control Unit RDME 8489402 Automatic

BMW i3 I01 LCI Rex 94Ah Hybrid ECU Engine Control Unit RDME is an original electronic control module designed for the BMW i3 hybrid powertrain with a range extender. Engineered to work with an automatic transmission, it ensures precise management of the powertrain and seamless integration with other vehicle systems. This solution is dedicated to users who expect stable hybrid system performance and full compatibility with BMW's factory electronics architecture.

Specifications and technical data

• SKU: 8489402
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8489402
• Substitutable numbers: 8489402, 12148489402, 8674363, 12148674363, 5WA11037, KD
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the RDME controller

The presented module belongs to the Electronic control modules and controllers category and is responsible for coordinating the operation of the Rex internal combustion engine and communicating with the vehicle's electrical system. The controller manages, among other things, powertrain operating parameters, communication with other modules in the vehicle network, and the system's response to signals from sensors and safety systems.

Thanks to its factory design, the ECU is fully integrated with the BMW i3 I01 LCI architecture, which allows for maintaining the original characteristics of the hybrid drive, smooth acceleration, and predictable vehicle behavior in various operating conditions.

Compatibility and integration with the powertrain

The controller has been developed to work with an automatic transmission, so its software and logic are adapted to the specifics of gear shifting without driver intervention. This translates into:

• smooth torque transfer between the engine and the gearbox,
• consistent operation of hybrid functions in urban and extra-urban modes,
• proper communication with comfort and safety systems.

As a component of BMW's factory electronics, the RDME module works with the vehicle's communication bus, which facilitates diagnostics, coding, and adaptation using professional service tools.

Product characteristics and service application

The offered controller comes from a BMW vehicle and is intended as a spare part for service processes, repairs, and replacing a damaged ECU. As a used component, it is a cost-effective solution for workshops specializing in electric and hybrid vehicle electronics, as well as for conscious users looking for original components at a reasonable price.

The module can be used both for standard replacement of a damaged controller and in more advanced repair projects where maintaining compliance with factory software and vehicle architecture is crucial.

Why choose a used ECU module?

Choosing a used engine controller for a BMW i3 is a solution that allows you to combine savings with maintaining the manufacturer's original specifications. OEM modules are designed for long-term operation, and their reuse in another vehicle – with proper selection and installation – allows for restoring full functionality of the powertrain without the need to invest in a new part.

To better understand the principles of selecting and installing such components, it is worth reading our guide on automotive electronics. Practical tips on how to select modules by OEM numbers, check hardware and software compatibility, and what to pay attention to during installation can be found in the article Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?.

Expanding the control system in a BMW

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other elements from the same group, such as additional controllers, powertrain management modules, or auxiliary system control units, check out the available parts in the BMW electronic control modules and controllers category.