How to Add 2025 Buick GL8 Smart Key with KEYDIY KD-X4 & DOIP Adapter?

This guide provides a straightforward walkthrough for programming a new 2025 Buick GL8 smart key using the KEYDIY KD-X4 and the Specialized DOIP Adapter. This process is essential for newer Buick models that utilize rolling code security.

Prerequisites & Tools Needed

Before starting, ensure you have the following hardware ready:

• KD-X4 Key Programmer
• KD Universal Smart Key
• KEYDIY DoIP Adapter
• Stable internet connection (for third-party password calculation)

Step-by-Step Programming Guide

Key Identification & Generation

First, verify the frequency of the original key to ensure the new KD smart key is programmed correctly.

• Test the original key’s frequency (it should be 433.92 MHz).
• Power on the KD-X4 and select Remote Function > Smart Key Remote. > Buick > GL8 2025-ID4A 433.92.
• Place the new KD smart key into the KD-X4 slot and generate the remote.

Hardware Connection

Newer Buick GL8 models require the DOIP protocol for IMMO programming.

• Disconnect the standard OBD plug and connect the DOIP Adapter.
• Plug the adapter into the vehicle’s OBDII port.

IMMO Programming & Password Calculation

Since the 2025 Buick GL8 uses a sophisticated rolling code system, static passwords will not work. You must perform an online calculation:

• In the KD app, navigate to IMMO Programming > KD-X4 > DOIP > Start Execution > Add Smart Key.
• Follow the prompts to press the start/stop button once, turn off the ignition and move all existing keys away from the sensing area.
• Rolling Code Entry: The device will generate data. Send this data to your third-party provider to receive the first password.
• Repeat the process for the second set of data to get the second password.

1. Final Matching

• Once the passwords are confirmed, wait 5 seconds.
• Place the new KD smart key into the square key slot next to the cigarette lighter.
• Press and hold the Start/Stop button for 5 seconds to finalize the link.

Testing the Results

After the app confirms "Matching Completed," test all remote functions:

• Unlock/Lock: Ensure the doors respond immediately.
• Sliding Doors: Verify the electronic sliding door buttons function correctly.
• Engine Start: Ensure the vehicle starts with the new key while the original is kept at a distance.

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