How to Shut Off the Anti-Theft Device in Your Car

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Anti-theft systems are designed to prevent your vehicle from being stolen. These systems are constantly evolving. Essentially, how they work is by an electrical circuit disconnecting to prevent power from flowing in some fashion so your car won’t start or to die immediately. An anti-theft system may also integrate a car alarm or it might be just an engine immobilizer.

It’s possible that the anti-theft system in your car won’t function correctly at some point. This may be for many reasons including a dead car battery that loses its key memory or a dead battery in your remote. It could also be that your immobilizer chip is damaged in your key or the car door lock is damaged.

If your car’s anti-theft system isn’t working correctly, you’ll need to find a way to shut the system off so your car will return to normal operation.

Method 1 of 2: Check your key and cylinder

opened key fob showing battery

Step 1: Check your key fob battery. A car’s anti-theft system may activate if your key fob battery is dead and hasn’t disabled the system.

Make sure the battery is installed correctly in your key fob. If the battery is correctly installed, replace it with a fresh battery and try again.

scratched door handle

Step 2: Check your door lock cylinder. If your car has been damaged in an attempt to steal it or break into it, the anti-theft system may have been engaged.

Check for damage to the lock cylinder itself or under the door handle where would-be thieves may have punched through with a screwdriver. If the lock is damaged, try using the passenger side cylinder if your car has one.

  • Note: While the driver’s side door lock is damaged, typically the passenger side won’t also be.

two types of keys shown

Step 2: Check that you are using the proper key to start your car. Many cars have a “valet” key or a door key that only performs certain functions such as unlocking the doors.

“Valet” keys are often distinguished by a “V” on the key shaft or a different-colored key head. The key you are using may not have the chip required to start your car.

Method 2 of 2: Turn the ignition on

If the anti-theft system has locked up your engine, you won’t be able to start it. You’ll have to disable it with these steps.

Step 1: Check for the anti-theft light. It’s located on your dash and will have a blue or red light.

close up of ignition with key inserted

Step 2: Turn the ignition to the "on" position. Insert the key into the ignition and turn it to the on position, which activates your accessories but not the engine.

Leave the key in position for about 10 – 15 minutes.

Step 2: Check the anti-theft light again. If it’s no longer blinking, turn the key back to the Off position and allow it to set for a minute or two.

This gives the system time to reset or you won’t be able to start your car.

Step 4: Start the engine. Attempt to start your engine.

If it still won’t start, check to make sure the battery hasn’t been drained.

Step 5: Repeat the process. Try the process over again to see if it will work.

Method 2 of 2: Use the key in your car door

Step 1: Insert your key in the lock on the door. Use the driver’s side door and the physical key even if your vehicle is equipped with a keyless entry system.

key inserted into door

Step 2: Turn the key. Turn the key to unlock your car door, but don’t release it.

Hold the key in this position for 20 to 20 seconds. This lets the system know you have the correct key, and it can allow you to bypass the alarm system. Some vehicles recognize the key simply by turning the key back and forth in the door lock key cylinder.

  • Tip: Try turning the key both ways fully to disable the anti-theft system.

Step 2: Try to start the engine. Remove the key and try to start the engine.

Be sure to leave the key cylinder in the unlocked position.

An anti-theft system that prevents your car from running properly is a nuisance, and while you may be thankful for it in the event of a crime, it is now causing you a great deal of inconvenience, which these steps have hopefully helped you resolve. If your car still won't start, you should consult with a professional from YourMechanic to determine if there is another issue that is preventing your car from starting.


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Damian

9 years of experience
364 reviews
Damian
9 years of experience
Ford Escape - Electric Problems - Palm Bay, Florida
Damian was very professional and courteous, he explained everything that he was doing. Found the door lock had corrosion and fixed it in a very timely manner. Will recommend him to friends and family.
Chevrolet Corvette - Electric Problems - Christmas, Florida
Was a wonderful experience we have a 1990 corvette had electrical issues Damian found the problem had it fixed within no time they come to you will definitely use them in the future for any mechanical issues

Bernie

50 years of experience
29 reviews
Bernie
50 years of experience
Ford Fusion - Electric Problems - Philadelphia, Pennsylvania
Great mechanic! Mr. Bernie Arrive in a timely manner. He was very professional and knowledgeable of his work. I would highly recommend Mr. Bernie to anyone.

Matt

13 years of experience
21 reviews
Matt
13 years of experience
Jeep Cherokee - Electric Problems - Tempe, Arizona
Great mechanic and dedicated to solving the problem the right way. Very friendly and came back to check two weeks later to make an adjustment at no charge. Also very willing to talk you through in layman's terms what he is doing and why it matters. Great guy all around!

Miguel

33 years of experience
238 reviews
Miguel
33 years of experience
Volkswagen Passat - Electric Problems - Ponte Vedra Beach, Florida
He was very courteous and nice. He fixed the problem very fast and cleaned up after himself, He explained everything to me so that I could understand. All in all he will be recommended to all my friends.

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