Q: What is the immobilizer system?

asked by on

What is the immobilizer system?

A: The immobilizer system is an antitheft devi...

The immobilizer system is an antitheft device. It’s designed to prevent any key but one programmed for your car to start the ignition. If a key that isn’t programmed correctly (or that has lost its programming because of a dead battery) is inserted into the ignition, the fuel pump will be disabled and the car won’t start.

If your key is working, the green immobilizer light on your dash should light up briefly when you crank the engine and then turn off. However, if the light flashes and the engine won’t crank, it means the immobilizer system doesn’t recognize the key.

Remove the key from the ignition and try it again, but the key may need to be reprogrammed.

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Difficulty starting, occasionally there is no cranking

The security chip and the sensor ring that sees the chip can cause the issue. The first thing to try is another key that is not worn. If this works, then have more keys made; this should fix your issue....

Q: I emptied my oil and it came out way to fine and with gas.

Hello. If there is a lot of fuel in the oil, then you either have an injector that is leaking too much fuel into the engine or you have a compression issue. Most of the time this is caused by...

Q: Red light showing a car with a lock is on?

Hi, thanks for writing in. I'd be happy to help. This is your car immobilizer light that indicates the car is armed. The immobilizer, usually called Securi-Lock in Ford vehicles, is a passive anti-theft device that disables your vehicle’s ability...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...