How to Add a Smart Key to GAC Trumpchi GS8 (2021–2024) Using LAUNCH X431

Published: June 16, 2026

Quick Answer: The Smart Key Programming Process

You can program a new smart key for your GAC Trumpchi GS8 (2021–2024) using a LAUNCH X431 diagnostic scanner without visiting a dealership. The process involves connecting the scanner to the vehicle’s OBD-II port, navigating to the Immobilizer (IMMO) function, selecting "Key Programming," and following the on-screen prompts. In most cases, the entire procedure takes 10–20 minutes. However, you must have at least one existing working key and a valid 15–20 digit security code for the vehicle to proceed.

Why You Might Need to Add a Smart Key

There are several reasons why you might find yourself needing to program a new key for your GS8. Maybe you lost your primary key or it got damaged. Perhaps you simply want a spare for convenience or emergencies. Another common scenario is purchasing a second-hand GS8 where the previous owner only handed over one key — or worse, you suspect a lost key is still active, which poses a security risk. Adding and erasing keys gives you full control over who can access and start your vehicle.

Tools You Will Need

Before you begin, gather these essential items:

• LAUNCH X431 Scanner: Any model that supports GAC Trumpchi IMMO functions works well. Models like the X431 PAD VII, X431 PRO3, or X431 V+ are all suitable.
• OBD-II Extension Cable (Optional): This isn't strictly necessary, but it makes connecting the scanner more convenient when you're working under the dashboard.
• GAC Trumpchi GS8 (2021–2024) Smart Key: Make sure the new key fob is blank — meaning it has never been programmed to another vehicle.
• Vehicle Security Code: This is a 15–20 digit code. You can usually find it printed on a card in the glovebox or in the owner's manual. If you don't have it, you may be able to retrieve it online using the X431.

Step 1: Prepare Your Vehicle and Tools

Start by getting everything ready. Park your GS8 on a flat, safe surface and turn the ignition OFF. Close all doors, the hood, and the trunk — this prevents any electrical interference during the programming process. Charge your LAUNCH X431 tablet to at least 80% battery so it doesn't die mid-procedure. And most importantly, locate your existing working smart key. You cannot complete the process without it.

Step 2: Connect the LAUNCH X431 to the GS8

Plug the LAUNCH X431 VCI (Vehicle Communication Interface) into the OBD-II port. On the GS8, this port is located under the dashboard, typically near the driver's left knee. Once connected, turn the X431 tablet ON. Launch the LAUNCH X431 App, then navigate to Diagnostics > Add Vehicle > GAC > Trumpchi > GS8. Confirm the vehicle year (2021–2024) and the engine type when prompted. The scanner will download the necessary software if it hasn't already.

Step 3: Navigate to the Immobilizer (IMMO) Function

From the main diagnostic menu, select Immobilizer (IMMO) . The X431 will automatically begin reading the vehicle’s ECU data. Be patient — this can take a minute or two. Once the scan is complete, the "IMMO Functions" list will appear on your screen. This is where all key-related operations are located.

Step 4: Read and Enter the Security Code

Select Read Security Code (sometimes labeled as Security Access). Depending on your vehicle and your X431 model, one of two things will happen. The scanner might retrieve the code automatically from the ECU. Alternatively, you may be prompted to enter the code manually. If you don't have the code card, don't worry. The X431 offers an Online Security Code Retrieval feature. This requires a stable internet connection and an active LAUNCH subscription, but it's a lifesaver when the physical code is missing. Once the code is entered correctly, the IMMO system will unlock for programming.

Step 5: Program the New Smart Key

Now for the main event. From the IMMO menu, select Program Key. The X431 will guide you through a series of prompts. Follow them carefully:

1. Insert the existing working key into the ignition slot, or if your GS8 has Keyless Go, hold it near the start button.
2. Turn the ignition ON — do not start the engine. A common mistake beginners make is turning the key too far and cranking the engine. Just turn it to the "ON" position.
3. Press OK on the X431 when prompted.
4. Remove the existing key and insert the new smart key into the slot, or hold it near the start button.
5. Turn the ignition ON again with the new key.
6. Press OK on the X431.

The scanner will process the data and display "Key Programming Successful" when finished. For vehicles with manual transmissions, put the gearbox in neutral before starting. For automatics, make sure you are in park. This prevents potential errors.

Step 6: Test All Keys

Disconnect the X431 and turn the ignition OFF. Now, test both keys thoroughly. First, check the remote functions — lock and unlock the doors using the key fob buttons. Then, verify that the engine starts with each key. If your GS8 is equipped with keyless entry, test that too by walking up to the door handle with the key in your pocket. If a key fails any of these tests, repeat Step 5. If the problem persists, the new key fob might have a weak battery or could be a counterfeit product.

Troubleshooting: Common Issues and Fixes

When to Seek Professional Help

While this is a DIY-friendly procedure, there are situations where calling a professional makes more sense. If the X431 cannot retrieve or accept the security code, you may be dealing with a corrupted ECU. Similarly, if you have zero working keys at all, the standard procedure won't work — a dealer or specialized automotive locksmith with advanced tools will need to handle the job. Finally, if you suspect the IMMO system itself is defective (for example, the ECU was flooded or damaged), professional diagnosis is the safest route.

Frequently Asked Questions (FAQ)

Can I program a smart key without the original key?

Not with the standard procedure described here. The LAUNCH X431 methods for the GS8 typically require at least one working key. If you have zero keys, you will need a dealership or a specialized locksmith with tools capable of generating a new key from scratch.

Do I need an internet connection for this?

You will need an internet connection for the initial step — downloading the vehicle software and potentially retrieving the security code online. However, the actual key programming step works offline once the code has been successfully entered and the IMMO system is unlocked.

How long does the battery last in the LAUNCH X431 device?

A fully charged LAUNCH X431 tablet typically lasts 4–6 hours of continuous use. For a 20-minute key programming job, battery life isn't a concern — as long as you remember to charge it beforehand.

Can I add more than one key at a time?

Yes. During Step 5, the X431 will typically prompt you to program additional keys in sequence. You can add as many as the vehicle's IMMO system allows, which is usually up to 4–5 keys total for the GS8.

Is this the same for the GAC Trumpchi GS8 Hybrid (2022–2024)?

Yes. The process is identical for both the internal combustion and hybrid versions of the second-generation GS8. The IMMO system operates the same way regardless of the powertrain.

How much does it cost to add a key using this method?

You only pay for the blank key fob, which typically costs between $30 and $60 online. If your LAUNCH X431 subscription covers IMMO functions, there's no additional fee. This is significantly cheaper than dealership costs, which can run $200–$400 for a single key.

Conclusion

Adding a smart key to your GAC Trumpchi GS8 using a LAUNCH X431 is a straightforward task — as long as you follow the sequence precisely and have the correct security code. The two most critical elements are having a working key to start the process and ensuring your new key fob is completely blank. As we covered in our guide on [link to related guide on using LAUNCH X431 for IMMO functions], keeping your scanner's software up to date is also essential for compatibility.

If you take your time and double-check each step, you will save both time and money compared to a dealership visit. For more details on maintaining your diagnostic tools, check out our article on [link to related article on X431 software updates]. And if you run into trouble, remember that professional help is only a phone call away.

About the Author: Erwin Salarda is an Automotive Service Equipment Technician based in the Philippines, specializing in computerized automotive diagnostic equipment such as OBD scanners and wheel alignment systems. Since 2012, he has been actively providing technical support, equipment installation, troubleshooting, after-sales service, and hands-on training for automotive service equipment used by workshops and automotive professionals.

He has received specialized training from international suppliers and manufacturers, including Launch X431 in Shenzhen, China, Lawrence Engineering Company in Guangzhou, China, and 3Excel Wheel Alignment Company in Shenzhen, China. Through these trainings, he developed advanced expertise in automotive diagnostics, calibration, wheel alignment systems, and computerized automotive service technologies.

Erwin Salarda provides professional after-sales support and technical training for automotive diagnostic and wheel alignment equipment, helping clients maximize the performance and proper use of their tools and systems. His experience covers equipment setup, software updates, calibration procedures, troubleshooting, and operational guidance for automotive workshops and service centers.

With more than a decade of experience in the automotive equipment industry, Erwin Salarda continues to support automotive businesses by delivering reliable technical expertise and practical training solutions.

For inquiries and equipment purchases, please visit https://carlifterph.com/

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