Q: What should I know about the immobilizer system?

asked by on December 14, 2015

What should I know about the immobilizer system?

Your car is equipped with both an alarm and an anti-theft system called an immobilizer. While the alarm will sound and the lights will flash, it’s the immobilizer that actually prevents a thief from stealing the car. Your keys include computer chips programmed to work with the ignition and computer in your car. If an un-programmed key is put in the ignition, the car will not crank.

You can tell if the immobilizer system is working based on the presence of an indicator light in the dash. After you remove the key (for non-smart key systems), the light should flash periodically to tell you that the system is on and active (it automatically turns on).

For smart key systems, the indicator light will flash periodically after you turn the stop/start switch to off.

In both types of systems, the light should go out when you insert your key or turn the switch to on with the electronic key in the car.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

What’s the correct procedure for driving?
Whether you’re an old hand at driving or this is your first vehicle, it pays to know the specifics regarding getting your car out on the road. While it’s not terribly complicated, there are a few things that should be...
How do I program a remote keyless entry (RKE) transmitter when I have a recognized transmitter?
Programming a new remote keyless entry (RKE) transmitter is easy when you already have a recognized transmitter. Just follow these steps carefully: Gather all of the transmitters – the new ones, and the already programmed one – so that they’re...
clutch feeling softer
Hello! This can depend on a variety of factors, but specifically, your driving style can cause this. If you tend to drive harder than normal - meaning you tend to transfer a lot of power through the clutch by releasing...
Possible fuel pump problems?
Assuming you have the stock equipment still in your truck, it should have come with throttle body fuel injection and not a carburetor. If this is the case, you likely have a low fuel pressure issue that is preventing the...
Will replacing your O2 sensor stop your car from vibrating at a stop?
Hi there, thanks for writing in. The replacement of the O2 sensor might help reduce engine vibrations, but if you're feeling the shaking in the steering wheel (https://www.yourmechanic.com/services/car-is-shaking-or-vibrating-inspection) when you slow down, it's most likely contributed to damaged brakes, wheel...
Driveline clunk and greasing the slip yoke
You can try using transfer case fluid (https://www.yourmechanic.com/services/transfer-case-fluid-replacement) as a lubricant. The transfer case fluid is just automatic transmission fluid. Using the lastest version of Dexron transmission fluid should work out fine. The service bulletin for drive line clunk instructs...
Ignition, Starter, or something else?
Hi there. I understand how frustrating things like this can be. Base on what you've described, the year, and mileage of the vehicle it sounds like your battery has gone weak or failed internally. A good battery test with a...
Car stopped while I was driving it; Check engine light is also on.
Have your computer checked to see if there is any pending or stored codes. This will lead you to a location on the engine for troubleshooting. There are many symptoms that can contribute to a stalling and no start condition...
No 3rd or 4th gears
Hi there. Typically when an individual gear is hard to shift into with a manual transmission, it's an internal gear failure inside the transmission case or linkage issue. When all gears are hard to shift, it's likely the clutch. Since...

Related articles

A Buyer’s Guide to the 2012 Infiniti EX
If If you’re in search of sport meets practicality, the EX may just be your perfect match. With the sedan-like driving of its G37 sibling combined with utility functionality and plenty of power under the hood, this is one SUV...
A Buyer’s Guide to the 2012 Subaru Impreza WRX
The The Subaru Impreza is already a popular and sporty model, but when you look at the 2012 Subaru Impreza WRX, it’s no wonder that people love it. This performance model adds a lot of features that help keep it...
2012 Ford Edge vs. 2012 Honda Accord: Which One Should I Buy?
Comparing a small SUV or a crossover to a sedan or coupe doesn’t quite seem fair: while the crossover is likely to cost more, it will also have a different skill set than the car as well as a completely...