Step-by-step guide to program a smart key for GAC Trumpchi M8 (2019-2024) with LAUNCH X431. Includes preparation, troubleshooting, and FAQ for keyless entry fobs.

Quick Answer / Key Takeaway

Programming a smart key for the GAC Trumpchi M8 (2019–2024) using a LAUNCH X431 diagnostic tool is a straightforward dealer-level procedure that requires the tool’s immobilizer (IMMO) function. After connecting the X431 to the vehicle’s OBD-II port, navigate to Special Function > Immobilizer > Key Programming, follow the on-screen prompts, and add or replace keys. The entire process takes 10–15 minutes. Ensure you have at least one working master key (if adding additional keys) and that the X431 software is updated to support the M8.

Before You Begin: Tools and Preparation

What You Need

Before diving into the procedure, gather the following items:

LAUNCH X431 – Any model with Immobilizer functions works (X431 V, Pro, Pro Mini, or newer versions).
GAC Trumpchi M8 – Model years 2019 through 2024.
Smart key(s) – Either new blank keys or existing keys you want to add.
Stable internet connection – Required for software updates on the X431.
Fully charged vehicle battery – Voltage drops during programming can cause errors or tool freezes.

Software Update

Connect your X431 to Wi‑Fi and run a System Update before starting. This ensures you have the latest firmware and the GAC Trumpchi vehicle-specific software loaded. Without this step, the tool might not recognize the M8’s immobilizer system.

Important Notes

Security Access: The M8 immobilizer may require a security access code. The X431 typically retrieves or bypasses this automatically, but if prompted, you’ll need to obtain the code from a dealer or a locksmith service.
Key Types: This procedure covers both smart keyless entry fobs (push‑button start) and transponder chip keys (if equipped). Verify your M8’s key type before starting. Most M8 models from 2019–2024 use a smart key with a mechanical backup blade.

Step-by-Step Programming Procedure Using LAUNCH X431

Step 1: Connect the X431 to the Vehicle

Turn the ignition OFF.
Locate the OBD‑II port under the dashboard on the driver’s side. Plug in the X431 main cable.
Turn the ignition ON (engine off). The X431 will power on automatically from the vehicle’s OBD port.

Step 2: Launch the X431 Diagnostic Software

Power on the X431 tablet (if it didn’t turn on automatically).
Tap Diagnostics on the home screen.
Navigate to GAC → Trumpchi → M8 (2019–2024).
Wait for the vehicle identification to complete. The X431 may do this automatically via VIN, or you may need to enter the VIN manually.

Step 3: Access Immobilizer / Key Programming

From the main diagnostic menu, tap Special Functions (or Immobilizer – the label varies by X431 firmware version).
Select Immobilizer System.
If a pop-up requests a security code, follow the on-screen instructions. The tool often retrieves the code automatically. If not, enter the code manually (obtained from dealer or locksmith).
Choose Key Programming or Add/Replace Key.

Step 4: Program the Smart Key

If You Have At Least One Working Key (Adding a New Key)

Select Add Key on the X431 screen.
Place the new smart key inside the vehicle. The exact position matters: often you must touch the key to the push‑button start, or place it in the cup holder (some models have a specific antenna pad). The X431 will display the required position.
The tool communicates with the key. Wait for confirmation – usually a beep from the vehicle or an on-screen message saying “Key Learned”.
Repeat for additional keys (up to 4 total).

If You Have Lost All Keys (Replacing All Keys)

Select Erase & Program or Replace All Keys.
The X431 will erase all existing key IDs from the vehicle’s memory.
Program the first new key by placing it in the required position and tapping “Start Programming”.
Add subsequent keys using the same method. You must program all keys you want to use in one session – any old keys not reprogrammed will be permanently disabled.

Step 5: Verify and Exit

Turn the ignition OFF for 10 seconds, then ON again.
Test the new key: Press the push‑button start without pressing the brake pedal – the dash should show “Key Detected”.
Test remote functions: lock/unlock doors, trunk release, remote start (if equipped).
Remove the X431 cable and close the diagnostic session.

Troubleshooting Common Issues

Problem	Likely Cause	Solution
X431 cannot communicate with immobilizer	Vehicle software not updated or wrong model selected	Re‑update the X431 and manually select the correct year/engine variant
“Security Access Failed”	M8 requires a dealer code	Retrieve code from a locksmith or dealer; some X431 modules can auto‑generate
Key programming completes but key does not work	Key not synchronized with Body Control Module (BCM)	Try repeating the procedure; ensure the smart key battery is charged (replace CR2032 if needed)
Error “Key Already Learned”	Trying to add a key already stored in memory	Use “Replace All Keys” to erase and start fresh
X431 freezes during programming	Low battery voltage or internet dropout	Reconnect, charge the vehicle battery, restart the X431, and begin from Step 1

Additional Tips

If your M8 has a smart key with a mechanical blade, ensure the blade is not damaged – it’s used for backup access only, but a damaged blade can cause issues with the ignition slot (if equipped).
For 2021+ models, some require the key to be placed in a specific position under the steering column – always check the X431’s on-screen guide for the exact location.
If you encounter persistent “Security Access Failed”, contact LAUNCH support or your X431 supplier – they can provide a security code generator for the M8.

FAQ

Q1: Can I program a key without any existing working key?
Yes, using the Replace All Keys option in the X431. You will need the vehicle’s security code (retrieve it via the X431 or from a dealer). All old keys will be erased, and you can program up to 4 new keys.

Q2: Does the LAUNCH X431 work for all GAC Trumpchi M8 years (2019–2024)?
Yes, provided the X431’s software is updated with the latest GAC Trumpchi package. The M8 underwent minor changes in 2021 and 2023, but the immobilizer protocol remains compatible across all those years.

Q3: How many keys can I program?
The M8 supports up to 4 smart keys. The X431 will allow you to add or replace keys until this limit is reached.

Q4: Do I need a subscription or credits to use the Immobilizer function on the X431?
Some X431 models (e.g., X431 V) require an active IMMO subscription or credits per key programming session. Check your tool’s subscription status beforehand – without credits, the immobilizer menu may be grayed out.

Q5: What if my X431 does not have a specific “GAC Trumpchi” menu?
Select GAC → Other Models or use the VIN auto‑detect feature. If still missing, contact LAUNCH support for a software add‑on. You can also try the “Automatic Search” function after connecting to the vehicle.

Q6: Can I program a used key from another vehicle?
Yes, but the key must be unlocked (erased) first. A used key can be reprogrammed to the M8 as long as the X431 can reset its internal memory. If not, the key may need to be “blanked” by a locksmith using specialized equipment.

Q7: How long does the battery in the smart key last?
Typically 2–3 years. If the key fails shortly after programming, replace the coin cell battery (CR2032) and re‑test. A weak battery can cause intermittent detection issues.

Q8: Is it safe to perform this procedure without professional training?
Yes, the X431 provides step‑by‑step prompts that guide you through every action. However, if you are unsure about security codes or vehicle electronics, consult a certified locksmith or dealer to avoid accidentally locking yourself out.

Related Sub‑Topics

Understanding the LAUNCH X431 Immobilizer Module – [link to related guide on similar topic] for an overview of IMMO capabilities and special functions.
GAC Trumpchi M8 Key Types and Barcode Locations – Where to find the key code (e.g., on the key blade or vehicle sticker) – useful for ordering replacement keys.
Common M8 Immobilizer Fault Codes – Such as U0100 (lost communication with ECM) and how to clear them after programming.
Comparison: LAUNCH X431 vs. Autel vs. Snap‑on for Asian Immobilizers – [link to related article on tool comparisons] to understand which tool offers the best value for GAC vehicles.
Post‑Programming Steps – How to test all key functions (remote lock/unlock, trunk release, push‑button start, and remote start) to confirm a successful session.

Published: June 16, 2026

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/

How to Program a Smart Key on a GAC Trumpchi M8 (2019–2024) Using LAUNCH X431