GM / Opel SeedKey 5 Byte ECU Calculator 1.0.0

GM / Opel SeedKey 5 Byte ECU Calculator

GM / Opel SeedKey 5 Byte ECU Calculator 1.0.0 is a lightweight Windows utility for supported GM / Opel ECU Seed-Key service workflows.

Select the correct ECU type, enter the 5-byte Seed Code and calculate the corresponding Key Code. The application provides automatic calculation for its supported ECU algorithms in a compact, single-window interface.

Supported ECU Types

The documented supported options are:

• E84.
• E39 / E39A.
• E78.
• E80.
• E82.
• E90.
• E92.
• E98.

Select the exact ECU type before calculating the key. The required Seed-Key calculation depends on the controller family selected.

Main Features

• GM / Opel 5-byte Seed-Key calculation.
• Simple ECU type selection.
• 5-byte Seed Code input.
• Automatic Key Code calculation.
• Support for E39 / E39A, E78, E80, E82, E84, E90, E92 and E98.
• Compact Windows interface.
• Built-in license information display.

How It Works

1. Select the correct supported ECU type in Type.
2. Enter the required 5-byte value in Seed Code.
3. Select Calculate.
4. Use the generated Key Code for the intended authorized service procedure.

The calculator performs the calculation automatically for its supported ECU algorithms, without manual calculation.

Windows Compatibility

The application is documented for:

• Windows 7.
• Windows 10.
• Windows 11.

Exact processor architecture, runtime dependencies, RAM and storage requirements are not specified.

License Information

The About window displays:

• Licensed user.
• License status.
• Expiration date.
• Remaining license time.

The illustrated About window shows a Test user and an active license. The expiration and remaining-time values shown are specific to that example license.

Important

Use the calculator only for authorized diagnostic, repair and ECU service work.

Always confirm the correct ECU family and Seed value before using the generated Key in a vehicle or diagnostic session.