Skip the auto shop - Our mechanics make house calls

Q: green security light doesn't come on all the time

asked by on

green security light isn't dependable

Is the immobilizer not letting the green security light from coming on on the dash and letting the vehicle start? Is there anything else that could keep the green security key light from coming on ? It's on the key switch, which we have replaced. However, the key switch replacements come with the immobilizer. My car has 250000 miles. My car has an automatic transmission. It will crank every time tho. We can't really drive this vehicle since it is so undependable about the light.

My car has 250000 miles.
My car has an automatic transmission.

As you know, your car is equipped with an anti-theft system that is operated by sensors typically on the doors that allow the anti theft system to be set when the doors are shut. When you shut your car door and lock it, these sensors relay this information to the security system letting it know that it is now safe to arm the vehicle. Sometimes these sensors tend to wear out or become faulty causing them to relay the wrong signal or in some cases not work at all causing the security system to not be set properly. I would suggest having an expert from YourMechanic come to your home to take a look at your car to properly diagnose and repair the security system.

Was this answer helpful?

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・Fair and transparent pricing

Get a quote

What others are asking

Q: My dashboard instrument panel stopped working all of a sudden

Instrument panel failures were a problem with this model, largely caused by water leaks in the windshield/cowl area that found their way to the instrument cluster (Technical Service Bulletin 383318). There was even an informal customer satisfaction program early in...

Q: Battery not charging and car unable to start

The problem you are having sounds like a starter assembly failing, but this usually causes a click from the relay or the starter assembly which is fastened to the engine. I recommend having a local expert, like one from YourMechanic,...

Q: Did intake gasket. Car now bogs and stalls when started. Maf and misfire codes

Hello, thank you for writing in. Simply pulling the mass airflow sensor is not a good enough test. You will want to test it with a multimeter to get an accurate reading on how it is working. The symptoms you...

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 Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...