Step-by-step guide to perform Honda All Keys Lost (AKL) programming using the LAUNCH X431 IMMO Elite scanner. Includes PIN reading, key programming, troubleshooting, and FAQs.

How to Perform Honda All Keys Lost Programming With the LAUNCH X431 IMMO Elite Scanner

Last Updated: May 25, 2026

Quick Answer

Performing an All Keys Lost (AKL) procedure on a Honda with the LAUNCH X431 IMMO Elite requires three core steps: Secure Access – log into the vehicle using a valid subscription (e.g., X431 Honda software); Obtain the PIN Code – use the IMMO Elite’s Read PIN function to retrieve the immobilizer password from the ECU or BCM; Program Keys – navigate to the All Keys Lost menu, enter the PIN, delete all existing keys, and learn the new transponder keys (typically by inserting and turning the ignition). The entire process usually takes 10–20 minutes and requires a stable internet connection and a 12V battery maintainer.

Why This Matters: The Reality of Losing All Honda Keys

Losing every key to your Honda—or a customer’s Honda—feels like hitting a dead end. No starting. No unlocking. Just a car that refuses to recognize anything you insert into the ignition. In the past, this meant a tow truck to the dealership, a long wait for PIN retrieval, and a bill that stung.

The LAUNCH X431 IMMO Elite changes that equation. This specialist tool gives independent technicians the ability to bypass the dealer entirely. It reads the immobilizer PIN directly from the vehicle’s modules and reprograms new keys on the spot. For a shop that does regular key work, that capability can turn a stranded customer into a same-day success story—and keep that profit margin in your pocket instead of handing it to the dealership.

Prerequisites: Before You Start

Before diving into the procedure, take five minutes to verify everything you need. Skipping this checklist is the fastest way to waste an hour with a bricked ECU.

Vehicle Identification

Confirm the Honda model and year range. The AKL function on the LAUNCH X431 IMMO Elite works most reliably on 2016 and newer models—including the Civic, Accord, CR-V, HR-V, Odyssey, and Pilot. Older vehicles (pre-2016) may still be supported, but they sometimes require a different procedure or a security code from the original dealer.

Tool Requirements

You’ll need the LAUNCH X431 IMMO Elite, paired with an X431 PAD, VCI, or any compatible LAUNCH tablet that runs the IMMO software. Make sure your device is fully charged and running the latest firmware. An outdated tablet can cause communication drops mid-procedure.

Subscription Check

Your X431 account must have an active Honda Full System or IMMO license. Some features—especially PIN reading on newer vehicles—require paid tokens. Log into your account ahead of time and verify your subscription. Nothing is more frustrating than getting to the PIN-reading step only to see “License required.”

Key Preparation

Have at least two new, unprogrammed transponder keys ready. For most 2016+ Hondas, you need a 48-bit chip key. Older models sometimes use a 46-type chip. Confirm the chip type before buying blanks. Aftermarket keys from Ilco, Keyless2Go, or Strattec work well as long as they match the correct protocol.

Safety

Connect a 12V battery maintainer or charger to the vehicle. The programming process communicates with the ECU and BCM over the CAN bus, and a voltage drop—even a brief one—can interrupt the session and lock you out. I’ve seen a car go completely dead mid-program, and recovering from that state requires starting the entire procedure over from scratch. A simple $40 maintainer prevents that headache.

Step-by-Step: Honda All Keys Lost Programming

Follow these exact steps to avoid immobilization errors. The sequence matters—do not skip ahead.

Step 1: Establish a Stable Connection

Power on the LAUNCH X431 device and connect the VCI (diagnostic interface) to the vehicle’s OBD-II port. The port is typically located under the dashboard, near the steering column. Place the VCI within five feet of the vehicle to ensure stable Wi-Fi or Bluetooth communication. Open the LAUNCH X431 app and select Diagnostics.

A common mistake here is leaving the VCI too far away or inside a metal toolbox. Keep it in the cabin, ideally resting on the passenger seat, to maintain a strong signal throughout the session.

Step 2: Select Honda and Read the PIN

Choose Honda from the vehicle model list. Then navigate to Special Functions > IMMO (Immobilizer) > Read PIN. Depending on the vehicle, the tool may prompt you to enter the VIN manually. Type it carefully—one wrong digit and the tool might fail to locate the correct security algorithm.

Wait 30–60 seconds while the tool queries the ECU or BCM. When the PIN appears on screen, record it immediately. The code is usually five digits (e.g., 12345). Do not turn off the ignition after this step. The session remains active, and turning the key off may reset the immobilizer state.

Step 3: Access the All Keys Lost Function

Return to the IMMO menu and select All Keys Lost. On some Honda models, this option appears as “Erase All Keys” or “Key Programming.” The tool will display a warning: “This will delete all existing keys. Do you wish to continue?” Tap Yes.

This step erases every key ID stored in the immobilizer memory. If you have a working key you wanted to keep, you just lost it—so be certain before confirming.

Step 4: Enter the PIN Code

Input the five-digit PIN you recorded in Step 2. If the PIN is incorrect, the tool will reject it immediately. Double-check each digit. If you’re unsure, cancel the procedure and re-run the Read PIN function. Some Honda models (especially 2018+ Civics) use a dynamic PIN algorithm that changes if you restart the process—so read it again fresh.

Step 5: Program the New Keys

Now the actual programming begins.

Insert the first new key into the ignition and turn it to the ON position (the dash lights up, but do not crank the engine).
Tap OK on the X431 screen. Wait. You may see the dashboard flash or hear a beep. This indicates the ECU has learned the first key.
Remove the first key and immediately insert the second key. Turn it to ON and tap OK again.
Repeat for any additional keys (most Honda models accept 4–6 keys total).
The tool displays “Programming Complete” after a few seconds.

One nuance I’ve learned from doing this on multiple Hondas: keep the pace steady. If you wait too long between keys (more than 10–15 seconds), the ECU may time out and exit learning mode. If you rush too fast, the tool might not confirm each key. Aim for about five seconds between key swaps.

Step 6: Test All Keys

Turn off the ignition, remove the last key, and test each programmed key by attempting to start the engine. The engine should crank and start normally. Also verify remote lock and unlock functions if the keys include remote fobs. If a key starts but the remote doesn’t work, you may need to sync the fob separately (see troubleshooting below).

Troubleshooting Common Issues

Problem	Likely Cause	Solution
Tool cannot connect to ECU	Dead 12V battery or weak Wi-Fi	Connect battery charger. Move VCI closer to OBD port. Reboot tablet.
PIN reading fails	Incompatible model (e.g., early 2000s Honda)	Check vehicle compatibility on LAUNCH website. Use manual PIN extraction via security code sheet.
“Key Not Learned” error	Transponder type mismatch	Verify key chip type (e.g., use Honda 48-bit chip for 2016+ models). Try a different brand of key blank.
Engine starts then dies	BCM still remembers old key	Re-run “All Keys Lost” procedure from scratch. Ensure no other key fobs are near the vehicle.
Remote functions not working	Battery disconnected during programming	Re-sync remotes: Lock/unlock driver door manually, then press lock on remote 5 times rapidly.

Let me expand on that last issue. A power interruption during programming can desync the remote keyless entry codes even if the immobilizer chip was learned. To re-sync, sit inside the car with all doors closed. Manually lock and unlock the driver’s door using the interior door lock button. Then, within 10 seconds, press the lock button on the remote five times quickly. The door locks should cycle to confirm sync. This trick works on most 2017–2023 Hondas.

Topical Depth: Understanding the Context

Why All Keys Lost Requires Specialist Tools

Honda immobilizers use a rolling-code challenge-response system. Each time you insert a key, the ECU generates a random number and sends it to the transponder chip. The chip must reply with the correct encrypted response. Without a programmed PIN—stored securely inside the BCM or ECM—the ECU will not authorize fuel injection or ignition.

The LAUNCH X431 IMMO Elite communicates directly with the vehicle’s secure CAN bus to retrieve that PIN. It doesn’t guess or brute-force; it uses the same diagnostic protocols that Honda dealership tools use. That’s why the tool needs an active internet connection: it downloads the latest security tables from LAUNCH’s servers to match your specific vehicle.

Common Honda Models Supported

Civic (2016–2023)
Accord (2018–2023)
CR-V (2017–2023)
HR-V (2019–2023)
Odyssey (2018–2023)
Pilot (2019–2023)

Older models (pre-2016) may require a different procedure or a password from the original dealership. In those cases, you can sometimes find the PIN printed on a security code sheet that came with the vehicle’s owner’s manual. If the customer has that card, enter the code manually instead of using the Read PIN function.

The Role of the BCM vs. ECM

The immobilizer system involves two key modules:

BCM (Body Control Module) – Stores remote keyless entry codes (RKE). This module handles the lock/unlock and alarm functions.
ECM (Engine Control Module) – Stores immobilizer chip codes. This module authorizes the engine to start.

The LAUNCH X431 IMMO Elite handles both modules simultaneously during the All Keys Lost routine. It reads the PIN from whichever module stores it (usually the BCM on newer Hondas), erases all stored keys, and then writes the new keys into both modules. That’s why testing both the starting function and the remote function matters after programming.

FAQ: Honda All Keys Lost with LAUNCH X431

Can I program a Honda AKL without the original PIN?

Yes—the LAUNCH X431 IMMO Elite can read the PIN directly from the vehicle’s ECU or BCM. No need for dealer lookup.

How many keys can I program at once?

Most Honda models allow 4–6 keys. Program all available keys during the same session. If you re-enter the All Keys Lost mode later, it will erase the previously programmed keys, and you’ll have to start over.

Will this work on Honda motorcycles or ATVs?

No. This procedure is strictly for Honda automobiles equipped with a standard OBD-II port. Motorcycles and ATVs use a different immobilizer protocol that the X431 does not support.

Do I need an internet connection during the process?

Yes—an internet connection is required for the LAUNCH X431 to authenticate your subscription and download necessary vehicle data. The tool verifies your license online before allowing access to the IMMO functions.

What if the tool says “PIN not found” for my vehicle?

Try updating the LAUNCH software to the latest version. If the issue persists, the vehicle may use an older security protocol (e.g., Honda’s 8-digit PIN system) that requires manual extraction via a security code sheet. Check the glove compartment or owner’s manual for that card.

Can I use a generic transponder key, or must it be OEM?

Aftermarket keys work as long as they are compatible with Honda’s 48-bit system (e.g., Ilco, Keyless2Go). Always test one key before purchasing bulk. Avoid ultra-cheap blanks from unknown sellers—they often have inconsistent chip quality that leads to “Key Not Learned” errors.

Conclusion

Performing an All Keys Lost procedure on a Honda with the LAUNCH X431 IMMO Elite is a reliable alternative to dealership visits. By following the PIN-reading and key-learning sequence carefully, you can restore vehicle access and immobilizer functionality in under 20 minutes. Always keep a battery maintainer connected and use high-quality transponder keys to avoid failures.

Next Steps:

Check your LAUNCH subscription for the latest Honda updates.
Order pre-cut transponder keys specific to your vehicle’s year.
Practice on a junk yard ECU first if you are a beginner.

For more detailed guidance on using the X431 platform for other makes, check out our related guide on [link to related guide on Toyota smart key programming with LAUNCH X431]. And if you’re just getting started with diagnostic tools, read our beginner’s guide on [link to related guide on choosing the right OBD scanner for key programming].

Have you successfully programmed a Honda AKL with X431? Share your experience in the comments below!

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/

Honda All Keys Lost Programming With LAUNCH X431 IMMO Elite