Learn how to program a new key to your GAC Trumpchi GA8 (2015–2023) using a LAUNCH X431 scanner. Step-by-step guide, troubleshooting, and FAQs.

How to Add a Key to a GAC Trumpchi GA8 (2015–2023) with LAUNCH X431 – Complete Guide

Published: June 16, 2026

Quick Answer

Adding a new key to a GAC Trumpchi GA8 (2015–2023) using a LAUNCH X431 is a straightforward DIY task if you already have at least one working key. Connect the X431 to the OBD2 port, navigate to the immobilizer or key programming function, follow on-screen steps (which may require a security code retrieved from the vehicle), and write the new key to the system. The whole process takes 10–20 minutes. If you have zero working keys, you’ll need a dealer or locksmith with advanced tools.

Understanding the Key System on the GAC Trumpchi GA8

The GAC Trumpchi GA8 uses a smart key system (often called PEPS – Passive Entry Passive Start) for model years 2015 through 2023. This means the key fob communicates wirelessly with the vehicle’s Body Control Module (BCM) or Immobilizer Control Unit. Each key contains a transponder chip that stores a unique ID. When you press the start button, the vehicle checks that ID against its stored list. If it matches, the engine starts; if not, you get a no-start situation.

Key types supported: Smart key fob (with remote lock/unlock and push-button start). Some earlier GA8 models also include a separate mechanical key blade inside the fob for emergency door access.
Model year compatibility: All GA8s from 2015 to 2023 share a similar immobilizer architecture. The LAUNCH X431 software covers every year, provided you have the latest GAC software add-on installed.
Why add a key? You might have lost one key, bought a used car with only one key, or simply want a spare for peace of mind. Adding a key yourself using the X431 saves a trip to the dealer and can cut costs by 50–70%.

A common question I hear is: “Can I program a key from another GA8?” Yes, but you’ll need to erase its previous programming first. Otherwise, the immobilizer may reject it. We’ll cover that in the troubleshooting section.

Prerequisites & Preparation

Before you start, gather these items and prepare the vehicle:

Tools and items needed:

A LAUNCH X431 diagnostic scanner (X431 PAD VII, X431 V+, X431 PRO3, or any model that supports GAC Trumpchi immobilizer programming).
The OBD2 cable that came with your X431.
At least one existing working key for the vehicle. Some software versions prefer two working keys, but the “Add Key” function usually works with one.
Vehicle registration or proof of ownership – some software builds may request a security PIN that the dealer can provide.
A new, unprogrammed key blank. Use an OEM key or a high-quality aftermarket key with the correct FCC ID. Avoid cheap generic fobs that may not sync properly.

Vehicle preparation:

Park in a safe, well-lit area with good cellular signal if your X431 needs internet access for PIN retrieval.
Ensure the car battery is fully charged (voltage above 12.5V). A weak battery can cause communication errors during programming. Connect a battery maintainer if you’re unsure.
Turn the ignition OFF, close all doors, and remove any other key fobs from the car. You want only the working keys and the new key inside the vehicle during the process.

Step‑by‑Step: How to Program a New Key Using LAUNCH X431

Follow these steps carefully. The LAUNCH X431 interface may vary slightly between models, but the core logic remains the same.

1. Connect the LAUNCH X431 to the Vehicle

Plug the OBD2 connector into the port under the dashboard, on the driver’s side, near the hood release. The port is usually accessible without tools. Turn on your X431 and wait for it to boot up. From the main menu, select GAC → Trumpchi → GA8. Alternatively, you can choose the “VIN Scan” option and let the tool auto-detect the vehicle.

Pro tip: Before connecting, make sure your X431’s software is updated to the latest version. Older builds may miss the immobilizer menu for the GA8. You can check for updates via the device’s Wi-Fi or by connecting to a computer with the LAUNCH update tool.

2. Navigate to the Immobilizer / Key Programming Menu

Once the vehicle is identified, you’ll see a list of systems (Engine, ABS, SRS, etc.). Go to Diagnosis → System Scan → Special Functions. Look for an option labeled Immobilizer, Security Access, or BCM/PEPS Programming. On most GA8 models, it appears under “PEPS” (Passive Entry Passive Start). Select it.

Within the immobilizer menu, choose Key Programming → Add Key or Program Key. Do not select “Program All Keys” unless you intend to erase all existing keys and start fresh. The “Add Key” function preserves your current keys.

3. Retrieve the Security Code (PIN)

The GA8 immobilizer requires a 4‑digit (or sometimes 12‑digit) security PIN before it will allow key programming. The X431 can usually retrieve this PIN automatically by reading the ECU data. If it fails, you’ll see a prompt asking you to enter the PIN manually.

Where can you get the PIN?

From a GAC dealer – provide proof of ownership (registration and ID).
Via online PIN services – some LAUNCH subscriptions include PIN retrieval by VIN. The tool will guide you through that process.
From a locksmith – they can calculate the PIN from the VIN using specialized software.

For 2020‑and‑newer GA8 models, the X431 often reads the PIN automatically without any manual entry. If your tool asks for a PIN and you don’t have one, try the “Auto Search” or “Read PIN from ECU” option first.

4. Start the Key Programming Sequence

Once the PIN is accepted, the X431 will instruct you to insert the existing working key(s) into the ignition or bring them inside the vehicle (for smart key systems). Follow these typical steps:

With the ignition OFF, bring working key #1 into the vehicle. Turn the ignition ON (do not start the engine) and wait for the dashboard to light up. Then turn ignition OFF.
If you have a second working key, repeat the same step with key #2.
The X431 screen will display “System Ready – Learn New Key.”

Important: Do not remove the working key from the vehicle until the tool specifically tells you to. Removing it early can interrupt the learning process.

5. Program the New Key

At this point, the immobilizer is in learning mode. When prompted, take your new, unprogrammed key fob and either:

Insert it into the ignition slot (if your GA8 uses a traditional key slot), then turn ignition ON for 3 seconds and OFF.
Or, for smart key systems, simply bring the new fob inside the vehicle and press any button on the remote (lock/unlock). Some models require you to hold the fob near the start button for a few seconds.

You have about 30 seconds to complete this step. After that, the learning window closes. The X431 will then display “Programming Successful” or “Key Added”. If it fails, you’ll see an error message – refer to the troubleshooting section below.

6. Clear Codes & Exit

Once the new key is programmed, the tool may suggest clearing any fault codes from the immobilizer or PEPS module. Accept this to ensure no false trouble codes remain. Then disconnect the X431 and test your new key: lock and unlock the doors, then start the engine. Also verify that your original keys still work – they should.

If everything works, you’re done. If the new key doesn’t start the car, double-check that you selected “Add Key” and not “Program All Keys.” The latter would have erased your existing keys.

Troubleshooting Common Issues

Even with careful preparation, you might hit a snag. Here are common problems and their fixes:

Problem	Possible Cause	Solution
X431 says “Communication Error”	Loose OBD2 connection, low vehicle battery, or faulty cable	Reconnect the cable firmly, charge the car battery (≥12.5V), and try a different OBD2 cable if available.
“Security Code Incorrect”	Wrong PIN entered or outdated software	Re-read the VIN and use LAUNCH’s online PIN retrieval. Update software. Contact dealer for correct PIN.
“Learning Failed”	New key incompatible or not placed correctly	Use an OEM key. For smart key systems, ensure the fob is inside the cabin. For flip keys, hold the key near the start button.
“System Not Ready”	Too many failed attempts in a row	Wait 10–15 minutes with ignition OFF. Disconnect the car battery for 60 seconds, then retry from step 1.
Only one working key available	Some software versions require two existing keys	Try “Add Key” anyway – it sometimes works with one key. If not, visit a locksmith who can use a bypass tool.

Special case – used key from another GA8: If you’re using a key that was previously paired to a different car, you may need to erase its memory first. Some LAUNCH X431 models include an “Erase Key” function under the immobilizer menu. If not, a locksmith can wipe the key for a small fee.

FAQ – Adding a Key to GAC Trumpchi GA8

Q: Can I add a key without any existing working key?
A: Generally, no. The LAUNCH X431 can only put the immobilizer into learning mode if it detects at least one already-paired key. If you have zero keys, you’ll need a dealer or a specialist with advanced tools (like a T‑Code 007) to sync a new key from scratch.

Q: Do I need to remove the battery from the X431 during programming?
A: No. Keep the tool powered through the OBD2 connection. If your X431 is a tablet‑style unit, make sure its internal battery is sufficiently charged or plug it into a power source.

Q: Will programming erase my existing keys?
A: The “Add Key” function does exactly what it says – it adds a key without affecting existing ones. However, if you accidentally select “Program All Keys,” all stored keys will be deleted, and you’ll need to reprogram every key you own. Always double-check the menu option before confirming.

Q: My LAUNCH X431 doesn’t show a GAC Trumpchi menu – what now?
A: Update your software to the latest version. If the menu is still missing, your X431 model may not support immobilizer programming for GAC vehicles. Entry-level units (e.g., X431 Agile) often lack this function. Check with LAUNCH customer support for a compatibility list.

Q: Can I use a used key from another GA8?
A: Yes, but only after erasing its previous programming. The immobilizer stores the key ID; if that ID is already registered to another vehicle, the learning process will fail. Use the “Erase Key” function (if available) or take the key to a locksmith.

Q: How long does the key battery last?
A: Typical life is 2–3 years. If your new key doesn’t work after successful programming, replace the battery with a CR2032 coin cell. Also, test the remote lock/unlock range – weak batteries reduce range.

Final Tips for Best Results

Always back up your existing keys before starting. Mark them with a piece of tape so you know which is original and which is new.
Keep your X431 software updated. GAC occasionally updates immobilizer algorithms, and an outdated tool may fail to communicate.
If you get stuck, most LAUNCH X431 units have a built-in help file. You can also use the app’s remote support feature to connect with a technician.
For 2020+ GA8 models, the immobilizer may require a 12‑digit security code. The X431 usually retrieves this automatically via VIN, but if not, contact a dealer with your VIN ready.
Avoid cheap aftermarket keys. Invest in an OEM key or a reputable brand like GKN or Silca. Incompatible keys are the #1 cause of programming failures.

By following this guide, you can successfully add a spare key to your GAC Trumpchi GA8 (2015–2023) using a LAUNCH X431 – saving time and money compared to a dealer visit. As with any DIY programming, patience and careful reading of on-screen prompts are your best friends.

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/