Mechanic Wiki: How to Program a Mitsubishi Grandis Key with LAUNCH X431 (2026)

Step-by-step guide to program a Mitsubishi Grandis key using LAUNCH X431. Covers prerequisites, security code, troubleshooting, and FAQs. 10-15 min process.

Published: June 15, 2026
Last Updated: June 15, 2026

Quick Answer: How to Program a Mitsubishi Grandis Key with LAUNCH X431

To program a Mitsubishi Grandis key using a LAUNCH X431, you need a compatible diagnostic tool, a blank transponder key (ID13 or ID61 chip), and at least one working original key (if available). The process involves connecting the X431, selecting the Grandis model, erasing all existing keys via the immobilizer system, and then programming each key one by one. The entire procedure takes about 10–15 minutes and allows you to program up to four keys. If you have two working keys already, you can also add a third manually, but the X431 is the only reliable way to program a new key when all keys are lost.

Introduction

The LAUNCH X431 series has earned a strong reputation among automotive technicians and DIYers for its broad vehicle coverage and deep diagnostic capabilities. When it comes to Mitsubishi key programming, the X431 stands out because it supports immobilizer functions across multiple models, including the Grandis. This guide walks you through the exact steps needed to program a new key for a Mitsubishi Grandis using a LAUNCH X431, whether you’re replacing a lost key or adding a spare.

Important caveat: This guide assumes you have an X431 with the latest software updates installed, specifically the Mitsubishi immobilizer package. Using an outdated tool may cause communication failures or even lock out all existing keys. Proceed with caution — incorrect programming can leave you stranded.

Prerequisites

Before you begin, gather the following:

LAUNCH X431 diagnostic tool – any model in the X431 series (including X431 PAD, X431 PRO, or X431 V) with a working VCI (Vehicle Communication Interface).
Blank transponder key – cut to match your Grandis ignition. The transponder chip type varies by model year:
- Early models (2004–2008): ID13 – 46 chip
- Later models (2009–2011): ID61 – 40/41 chip Verify your key type before purchasing a blank.
At least one working original key – if you have one, it makes the process smoother. If all keys are lost, you’ll need the security code.
Vehicle battery in good condition – low voltage can interrupt the programming sequence. Consider connecting a battery maintainer.
All keys you want to program – including any existing ones. The X431 will erase all programmed keys during the process, so have every key you intend to use ready.

Step-by-Step Programming Procedure

Step 1: Prepare the Tool and Vehicle

Turn the ignition OFF and close all doors. Ensure the engine is not running.
Connect the X431 VCI to the OBD-II port, located under the dashboard on the driver’s side.
Launch the X431 app on the tablet. Wait for the tool to establish communication with the vehicle.
Select “Mitsubishi” from the vehicle manufacturer list. The tool will load the available systems.

Step 2: Access the Immobilizer System

From the main menu, choose “Grandis” as the model. If Grandis is not listed directly, select “Mitsubishi” then navigate to “Immobilizer”.
Within the immobilizer menu, select “Immobilizer Programming” then “Key Programming”.

Step 3: Enter the Security Code (if required)

Some Grandis models require a 4-digit security code to authorize key programming. If the X431 prompts you for a code, you have two options:

Retrieve the code using the X431 – look for a function called “Security Code Retrieval” or “Read Security Code” under the immobilizer menu. This may require an internet connection. The tool reads the code directly from the ECU.
Obtain the code from a dealer or locksmith – based on the vehicle’s VIN. If retrieval fails, this is your fallback.

If no code is required, simply proceed to the next step.

Step 4: Erase All Keys

This is a mandatory step when programming a new key, even if you only want to add one. The system will ask: “Erase all keys?” – select YES.
Wait for the confirmation message. After erasing, none of the original keys will work until they are reprogrammed.

Step 5: Program the First Key (usually the original key)

Insert the first working key into the ignition.
Turn the ignition ON (dashboard lights illuminate, but do not start the engine).
Press the “Program Key” button on the X431 screen. The tool will communicate with the transponder chip inside the key.
Wait for a success message. Then turn the ignition OFF.

Step 6: Program Additional Keys

Insert the next key (original or new blank) into the ignition.
Turn the ignition ON.
Press “Program Next Key” on the X431. The tool will register that transponder.
Repeat for each key you want to program. The Grandis system typically supports up to four keys.

Step 7: Finalize and Test

Turn the ignition OFF and remove all keys.
Wait about 10 seconds to allow the ECU to finalize the process.
Test each key individually:
- Start the engine – confirm the immobilizer disengages and the engine runs.
- Check remote functions – lock/unlock doors. If the remote doesn’t work, you may need to program the remote separately (see Troubleshooting Issue 5).

Troubleshooting Common Issues

Issue 1: Tool Stuck at “Connecting” or “No Communication”

Check the OBD connection – reseat the VCI and try a different OBD port if available (some vehicles have two ports).
Ensure the ignition is OFF when connecting the tool. Connecting with the ignition ON can cause a conflict.
Update the X431 software to the latest Mitsubishi version. Outdated databases may not recognize the Grandis immobilizer system.

Issue 2: “Incorrect Key” or “Key Already Exists”

This message appears when the X431 detects a transponder that is already programmed or incompatible.

You must erase all keys first (Step 4). If you skipped this step, go back and perform it.
The blank key must match the correct transponder type (ID13 or ID61). A mismatched chip will be rejected.

Issue 3: Can’t Find Security Code

Use the X431’s “Security Code Retrieval” function under the immobilizer menu. This requires a stable internet connection.
If retrieval fails, contact a Mitsubishi dealer or a professional automotive locksmith. The code is unique to your vehicle and tied to the VIN.

Issue 4: Programming Fails Mid-Procedure

Low battery voltage is a common culprit. Connect a battery maintainer or charger before starting.
The transponder chip may be damaged or incompatible. Verify the blank key type before programming.
Try manually cycling the ignition ON/OFF several times before pressing the tool buttons. This sometimes resets the immobilizer module.

Issue 5: Remote Not Working After Programming

Remote keyless entry (RKE) functions are separate from the immobilizer. Even after successful transponder programming, the remote buttons may not work.

Use the X431’s “Remote Programming” function under the immobilizer or body control module menu.
Alternatively, try the manual method: insert the key, turn to ON, then press and hold the lock/unlock button for a few seconds. Consult your owner’s manual for the exact sequence.

Frequently Asked Questions

Can I program a Mitsubishi Grandis key without any working key?

Yes, you can. The LAUNCH X431 can program new keys even if all original keys are lost. You will need the security code, which the X431 can retrieve from the ECU (or obtain from a dealer). The tool erases all keys first, then allows you to program new ones from scratch.

How long does the programming take?

The entire process, including erasing and programming up to four keys, typically takes about 10–15 minutes. Allow extra time if you need to retrieve the security code or update the tool’s software.

Will the X431 program the remote fob as well?

Most X431 models support separate remote programming. After completing the immobilizer programming, go to the “Remote Programming” menu and follow the on-screen instructions. This usually involves pressing specific remote buttons (lock/unlock) to sync the fob with the vehicle.

Do I need to disconnect the battery before programming?

No, you do not need to disconnect the battery. However, ensure the battery is fully charged. Do not turn off the X431 or disconnect the VCI during the programming process, as this can corrupt the immobilizer data.

What year Grandis models are supported?

The LAUNCH X431 supports Mitsubishi Grandis models from approximately 2004 to 2011, covering both EU and global specifications. Verify compatibility through your X431’s vehicle coverage list or update the software if needed.

Can I use an aftermarket key blank?

Yes, as long as the blank contains the correct transponder chip (ID13 or ID61) and is cut to match your ignition lock. Be aware that some aftermarket remotes require cloning of the original remote frequency — the X431 can program the transponder but cannot clone RF signals. You may need a remote that is pre-programmed or compatible.

What if the X431 says “Immobilizer Not Supported”?

First, update the tool’s software via Wi-Fi. If the message persists, your specific Grandis variant may use a different immobilizer module that the X431 does not support directly. In that case, you may need a dedicated diagnostic interface or professional locksmith service.

Additional Tips & Context

Back up your original keys – always keep at least one working key before erasing all keys. If something goes wrong, you’ll have a fallback.
Use genuine LAUNCH X431 software – cloned or outdated versions can corrupt the immobilizer or fail to communicate. Always update from the official LAUNCH store.
Manual key programming method – if you already have two working keys, you can program a third key without a diagnostic tool: insert the first key, turn it ON for 5 seconds, then OFF; insert the second key, turn ON for 5 seconds, then OFF; finally insert the third key and turn ON. This method only works for adding keys, not for lost-all-keys scenarios.
Security code retrieval – if the X431 supports it, use the “Read Security Code” function and write the code down. You may need it again in the future.
After programming – cycle the ignition several times (ON/OFF) to ensure the ECU recognizes all transponders. A full learning cycle sometimes requires two or three ignition cycles.

Final Checklist

☐ Tool updated to latest Mitsubishi firmware
☐ Correct blank key type (ID13 or ID61) and properly cut
☐ All keys you want to program (including originals) are on hand
☐ Engine off, doors closed
☐ Battery fully charged (consider a maintainer)
☐ Security code retrieved (if required)

Following these steps precisely with the LAUNCH X431 will give you a successfully programmed key for your Mitsubishi Grandis. For complex issues, such as a corrupted immobilizer module or an unsupported Grandis variant, consult a professional automotive locksmith or a Mitsubishi dealership.

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/