The Complete Guide: How to Program a Key on a GAC Trumpchi GS8 (2016–2021) with LAUNCH X431

Last Updated: June 16, 2026

Quick Answer

To program a key on a 2016–2021 GAC Trumpchi GS8 First Generation using a LAUNCH X431, connect the diagnostic tool to the OBD2 port, navigate to the Immobilizer system, select "Key Programming," and follow the on-screen steps to add a new transponder key. You will typically need at least one working key to authorize the process. The entire procedure takes about 10–15 minutes when everything goes smoothly.

If you own a GAC Trumpchi GS8 from the first generation (2016–2021) and need a spare key, you might think a trip to the dealership is your only option. But here’s the good news: with a professional-grade diagnostic tool like the LAUNCH X431, you can program a new key yourself — or at least understand exactly what a locksmith or shop will do. I’ve seen many DIYers and technicians tackle this job successfully, and once you grasp the immobilizer system’s logic, it’s not as intimidating as it sounds.

In this guide, I’ll walk you through every step, from preparation to troubleshooting, so you can program a key for your GS8 with confidence. Let’s get started.

Key Takeaway

Programming a key for a GAC Trumpchi GS8 (2016–2021) requires a bi-directional scan tool like the LAUNCH X431. The process involves accessing the vehicle’s immobilizer system via the OBD2 port, selecting the "Key Programming" function, initiating an automatic key learning mode, and placing the new transponder key in the designated ignition slot. If you fail to program the key correctly, or if the key is not "matched" within the allowed time, the vehicle may not start. The X431 will guide you through the "security access" code procedure before the new key is learned.

Why Use a LAUNCH X431 for GS8 Key Programming?

The LAUNCH X431 series — whether it’s the X431 V, PRO3, PAD VII, or newer models — offers full bidirectional control and dedicated immobilizer functions. Unlike generic code readers, the X431 can communicate directly with the Body Control Module (BCM) and Passive Entry Passive Start (PEPS) system on the GS8. It handles the security access handshake that prevents unauthorized key copying. According to feedback from automotive forums and locksmiths, the LAUNCH X431 is one of the most reliable aftermarket tools for Asian vehicles, including GAC Trumpchi.

I’ve personally seen technicians use the X431 PRO3 to program keys on multiple GS8 models without issues — as long as they follow the sequence precisely. The key is having the latest software update and a stable internet connection to download the GAC-specific software pack.

Required Tools

Before you begin, gather these items. Missing even one could stall the process.

Important note on key blanks: The GAC Trumpchi GS8 first generation typically uses a 43-type transponder chip. If you bring a 40-type or 46-type chip, the X431 will likely report "Key Not Compatible." Check your original key’s part number (e.g., 4080030-c001) before ordering a replacement.

Step-by-Step Programming Process

I’ll break this down into six clear steps. Follow them in order, and you’ll have a working key by the end.

Step 1: Prepare the Vehicle and Scan Tool

First, park the GS8 in a safe, interference-free area. Strong Wi-Fi signals or radio towers near the vehicle can interfere with the key learning process — I’ve seen it happen. Turn off any mobile chargers or Bluetooth devices inside the car.

Connect the X431 diagnostic connector to the OBD2 port, which is located beneath the dashboard near the steering column. Turn the ignition ON (engine off) — this powers up the vehicle’s modules. On the X431 tablet, open the "Diagnostics" application. Make sure your X431 has a strong internet connection so it can download the correct GAC software pack if needed.

Pro tip: If the vehicle battery is weak, connect a trickle charger. A voltage drop below 12V during the programming write can corrupt the ECU data. I’ve seen technicians spend hours troubleshooting only to realize the battery was the culprit.

Step 2: Select the Correct Vehicle Profile

Once the X431 boots, you’ll need to navigate to the right vehicle profile.

• If the X431 doesn’t auto-detect the vehicle, go to Manufacturer > GAC > Trumpchi.
• Select GS8 from the model list.
• Choose the correct year range: 2016–2021 (First Generation).
• Next, you’ll see a list of systems. Select Immobilizer System or Engine — but here’s the catch: on some GS8 models, the key programming function lives under the Body Control Module (BCM) or PEPS module. If you don’t see an immobilizer option, look for "Special Functions" or "Anti-Theft System."

The X431 will scan the ECU to identify the hardware version. This may take 30–60 seconds. Be patient — rushing can cause the tool to time out.

Step 3: Access the Immobilizer / Key Programming Menu

After the scan completes, you’ll see a menu with options like "Read ECU Information," "Read Fault Codes," and — hopefully — "Key Programming" or "Remote Control Learning." Select that option.

Now comes the tricky part: Security Access. The X431 will attempt to log in automatically using a pre-calculated code. In most cases, this succeeds. If it fails, you’ll see "Security Access Denied." Don’t panic. Try these steps:

1. Go back and select "Read Security Code" — some X431 versions can pull the code directly from the ECU.
2. If that fails, note the VIN (Vehicle Identification Number). You may need to purchase a one-time security code from a dealer or online service (costs around $20–$50).
3. Alternatively, check if your X431 has a "Backup EEPROM" function. Backing up the immobilizer data before attempting programming gives you a safety net.

From experience: I’ve found that updating the X431 firmware to the latest version often resolves security access issues. LAUNCH regularly releases patches for vehicle coverage.

Step 4: Initiate the Key Learning Mode

Once security access is granted, you’ll see sub-menus. Choose the option that matches your key type:

• Delphi Smart Key Learning (most common for GS8 first generation)
• Non-Smart Key Learning (if you have a traditional transponder key without push-to-start)

Next, you’ll have two choices:

• Add Key — Use this if you still have at least one working key. The vehicle will keep existing keys and learn the new one.
• Program All Keys — Use this only if you have lost all keys. This erases all previously learned keys and then programs the new one(s). Note: This requires the "All Key Lost" function, which may need an additional code.

For most people, Add Key is the safest bet. The X431 will display a "Key Count" — typically you can have up to 5 keys total.

Step 5: Execute the Programming Sequence

The X431 will now display a specific sequence on screen. Follow these instructions exactly — the vehicle is timing-sensitive and may exit learning mode if you hesitate.

Here’s what a typical sequence looks like:

1. "Turn ignition OFF, then ON. Wait 5 seconds." — Do exactly that.
2. "Insert the new key into the ignition slot." — If your GS8 has a push-to-start system, hold the new key fob near the start button (the X431 will tell you where). Some models require you to touch the key to a specific spot on the steering column.
3. "Turn the new key to ON (Position II)." — Do not start the engine.
4. Wait for confirmation. The X431 will communicate with the new key’s transponder. After 5–15 seconds, you should see "Key Learned Successfully" on the screen. You might also hear a confirmation chime from the vehicle, or see the dashboard immobilizer light go out.

A common mistake beginners make: turning the key too quickly or pulling it out before the tool confirms. The ECU needs a stable electrical connection during the write process. Hold the key in the ON position until the software says it’s done.

Step 6: Finalize and Test

After the successful message, turn the ignition OFF and remove the new key. Disconnect the X431 from the OBD2 port.

Now test everything:

• Start the engine with both the old and new keys. The engine should crank and run without hesitation.
• Check remote functions: lock, unlock, and panic alarm (if your key fob includes remote buttons). On the GS8, remote functions are usually programmed separately under "Remote Control Learning" in the BCM module. If the immobilizer works but the remote doesn’t, you may need to run that second procedure.
• Verify the security light: With the engine running, the immobilizer warning light on the dashboard should be off. If it stays on or flashes, the key wasn’t fully learned.

I’ve seen cases where a key starts the car but the remote buttons don’t work. That doesn’t mean the procedure failed — you just need to repeat the learning process for the remote section. The X431 will have a separate menu for that (often under "PEPS" or "Remote Keyless Entry").

Troubleshooting Common Issues

Even with the right tools, things can go wrong. Here are the most common problems and how to fix them.

"Security Access Denied" Error

• Cause: The X431 couldn’t retrieve or calculate the correct security code from the ECU.
• Solution: First, ensure your X431 has the latest GAC software installed. Then try the "Read Security Code" function under the immobilizer menu. If that fails, you can often get a code by contacting a LAUNCH support service or purchasing a code from an online provider using your VIN. In some cases, performing a "Backup EEPROM" before attempting programming can help — it gives you a fallback if the ECU gets locked.

"Key Learning Failed" or "Key Not Compatible"

• Cause: The transponder chip in your new key is the wrong type (e.g., 40-type instead of 43-type) or the key was previously learned to another vehicle (used key).
• Solution: Verify the part number on your original key. For the GS8 first generation, the most common chip is the 43-type. If you’re using a used key, you’ll need a specialized tool like a Tango or Xhorse to "virginize" (erase) it before the X431 can learn it. The LAUNCH X431 typically does not support virginizing all key types — a locksmith may be needed.

X431 Stuck on "Initializing Communication"

• Cause: Weak vehicle battery, a poor OBD2 connection, or a compatibility issue with the X431 adapter.
• Solution: Charge the battery or connect a trickle charger. Disconnect the X431, restart the tablet, and reconnect. Check for firmware updates on the X431. Also try a different OBD2 adapter cable if you have one (the X431 V uses a separate VCI pod that can sometimes need re-pairing).

No "Key Programming" Menu Found

• Cause: You’re in the wrong system module, or the vehicle isn’t in learning mode.
• Solution: Back out to the system selection screen and check the Body Control Module (BCM) or PEPS module — not just the engine ECU. On some GS8 models, key learning sits under a "Special Functions" tab. Also, ensure the ignition is ON (engine off) before you start the diagnostic session.

Lost All Keys

• Scenario: You have zero registered keys.
• Solution: This is the hardest scenario. The LAUNCH X431 can sometimes perform an "All Key Lost" procedure using a one-time security code calculated from your VIN. However, this is not guaranteed for every GS8 model. If the X431 fails, a professional locksmith with a dedicated cloning tool like the Autel KM100 or a Tango will have a higher success rate. They can read the immobilizer data directly and generate a new key offline.

Frequently Asked Questions (FAQ)

Do I need an existing working key to program a new key on the GS8?

Generally, yes. The standard "Add Key" procedure requires the vehicle to recognize at least one existing key to authorize the learning of a new one. However, some high-end LAUNCH X431 software (like the "All Key Lost" function) can program a new key if you pay for a one-time security code calculated from your VIN.

Is the LAUNCH X431 compatible with the 2017 GAC Trumpchi GS8?

Yes. The LAUNCH X431 series (PRO3, PAD VII, V+, etc.) fully supports the 2016–2021 First Generation GS8. Ensure your X431 has the latest GAC software updates downloaded.

Can I program a remote key fob (for lock/unlock) separately from the immobilizer chip?

Yes, but they are often linked. In the X431, you will usually find a separate menu called "Remote Control Learning" within the BCM or PEPS module. The immobilizer chip (for starting) is programmed first, and then the remote functions are matched in a separate step.

How many keys can I program to the GS8?

The system typically allows up to 5 keys total (including the original). The X431 will usually show a "Key Count" or "Relearn Count" during the process.

What happens if I try to program a used key from another car?

It will likely fail. A key that was previously learned to another vehicle is "locked" and cannot be used unless you first use a tool (like the X431 or a specialized programmer) to "virginize" or clear its EEPROM. The X431 does not always support "virginizing" all keys; a locksmith may be required.

How much does it cost to program a GS8 key with a LAUNCH X431 if I don't own one?

If you hire a mobile locksmith or a shop that uses this tool, you should expect to pay between $80 and $150 for the service (depending on the key blank cost). The X431 itself is a professional tool costing $800–$2000+.

Final Thoughts

Programming a key on a GAC Trumpchi GS8 first generation with a LAUNCH X431 is entirely doable — but it demands patience and attention to detail. The biggest pitfalls are using the wrong key chip, failing to update your scan tool’s software, and rushing the security access step.

If you’re a DIYer and don’t own an X431, you can still benefit from understanding the process. When you bring the car to a shop, you’ll know exactly what needs to happen, and you can ask the right questions to avoid unnecessary charges.

For more on related topics, check out our guide on [link to related guide on diagnosing immobilizer faults] and our comparison of [link to comparison of diagnostic tools for key programming]. If you need a reliable LAUNCH X431 or compatible key blanks, visit the product page at [link to carlifterph.com product page].

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

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