How do I get my Honda Odyssey out of security mode?

To get your Honda Odyssey out of Security Mode, use the original key fob to unlock the doors and then turn the ignition with the proper key to disarm the immobilizer. If the system remains engaged, you’ll likely need help from a dealer or a qualified automotive locksmith to re-sync keys or reset the immobilizer.

Security Mode can be caused by a weak key fob battery, a faulty immobilizer transponder, a dead 12‑volt battery, or a fault in the vehicle’s security fuse or wiring. The steps below cover common, legitimate fixes you can try before calling for professional help. If issues persist, professional service is recommended to avoid lockouts or further security triggers.

Home checks and basic resets you can try

These checks help determine whether the issue is a simple battery or key recognition problem, or something more complex inside the immobilizer system.

• Verify the key fob battery is fresh and functioning. Replace the fob battery (often CR2032) and test the remote.


• Try a spare key to rule out a damaged or worn transponder in the primary key.


• If your Odyssey uses a traditional ignition key, insert the key into the ignition and turn to ON, then back to OFF. Do not crank the engine if the immobilizer is active.


• If your model has a push-button start, ensure the key fob is inside the vehicle and within range as specified in your owner's manual. Try starting with the brake pedal pressed.


• Check the 12-volt car battery and connections. A weak or recently disconnected battery can trigger immobilizer issues or dashboard warning lights.


• Inspect obvious fuses related to the security/immobilizer circuit; a blown fuse can prevent normal disarm/start behavior.


• Look at the security/immobilizer indicator on the instrument cluster. A flashing or steady light can indicate immobilizer status and guidance in the owner’s manual.

These steps address the most common root causes (fob battery, key recognition, or battery health). If any of these resolve the problem, you can proceed to normal driving. If not, proceed to professional options described below.

When to contact a dealer or automotive locksmith

Call for professional help when basic checks don’t exit Security Mode or if you can't safely access the vehicle. A qualified technician can diagnose immobilizer faults and re-sync keys using Honda’s diagnostic tools.

• Your key is not recognized by the immobilizer even after trying a spare key and replacing the fob battery.


• The security light remains on or flashes after attempting to disarm, and the engine won’t start.


• The vehicle recently had a battery replacement, electrical repair, or has intermittent security warnings.


• You need re-learning of keys or reprogramming of the immobilizer, which requires professional equipment and authorization codes.

Note: Attempting to bypass or bypass-reset the immobilizer yourself can trigger additional security responses or render the vehicle undriveable. Seek authorized service to ensure proper re-learning of keys and security codes.

What a dealer or locksmith will typically do

Key re-learning and immobilizer diagnostics

Technicians will use Honda-specific diagnostic tools to read immobilizer fault codes, verify key transponder communication, and re-learn keys if necessary. This process ensures the vehicle recognizes your keys again and disables the security lockout correctly.

Electrical and fuse inspections

Service personnel will inspect the security circuit, wiring harnesses, and related fuses for damage or corrosion that could cause intermittent immobilizer behavior. Any faulty components are replaced or repaired.

IMM module considerations

In rare cases, the immobilizer (IMM) module itself or related control units may need replacement or reprogramming. This work is typically done at a dealership or a certified automotive locksmith with Honda-endorsed tools and software.

Summary

Security Mode in a Honda Odyssey is designed to protect the vehicle, but it can be triggered by simple issues like a weak key fob battery or a low 12-volt battery. Start with basic at-home checks—fob battery, spare key, and ignition procedure—and verify battery health. If the issue persists, contact a Honda dealer or qualified automotive locksmith for immobilizer diagnostics and key re-learning. Avoid attempts to bypass the security system, as improper handling can lock the vehicle or trigger additional protections. Keeping up with routine maintenance and having a spare key on hand helps prevent future lockouts.

How to reset Honda security system?

One two three it's going to reboot this system yes we're going to wait for this to power back up. Okay we're rebooting. Now. Okay it's all rebooted.

How to get Honda Odyssey out of anti-theft mode?

So you have to wait for the system to calibrate with your satellite. Then the screen will turn back on then you click okay. And there you go you're back to your home screen.

How to reset Honda Odyssey immobilizer?

To reset the Honda Odyssey immobilizer, try the following methods: use the key fob to hold the panic button for five seconds, then press the lock button twice and wait about 10 minutes. Alternatively, turn the key to the "ON" position without starting the engine and wait for the immobilizer light to stop blinking (about 10 minutes). If these fail, try disconnecting the battery for about 10 minutes to reset the system, or have a dealer use a diagnostic tool for a professional reset.
 
Method 1: Key fob reset

1. Hold the panic button on your key fob for five seconds.
2. Press the lock button twice.
3. Wait about 10 minutes before trying to start the car. 

This video demonstrates how to reset the immobilizer system in a Honda Odyssey: 57sMotor MatchupsYouTube · Jun 28, 2025
Method 2: Ignition and wait reset

1. Insert the key into the ignition and turn it to the "ON" position without starting the engine. 
2. Leave it in this position until the immobilizer light stops blinking, which may take up to 10 minutes. 
3. Turn the ignition off, wait a few seconds, and then try to start the engine normally. 

Method 3: Fuse or battery disconnect 

1. To reset with a fuse, locate and remove the fuse for the anti-theft system for one minute, then put it back in. 
2. As a last resort, disconnect the car's battery for about 10 minutes. This may help clear software glitches. 

If other methods don't work

• Check the key fob battery and signal strength. 
• Inspect the antenna ring around the ignition cylinder for damage or loose wires. 
• If the problem persists, a dealer may need to perform a professional reset or key programming using a diagnostic scan tool. 

How do I get my car out of security mode?

Try Unlocking the Door with the Physical Key
Sometimes, using the actual physical key (not the remote) to unlock the driver's side door can reset the anti-theft system. Insert the key, turn it to unlock, and hold it for a few seconds. This method works on many vehicles that use key-based security sensors in the door.