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 1,000 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!
  1. Home
  2. Questions
  3. green security light doesn't come on all the time

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: Leak from under dash

Hello. It is likely the heater core causing the leak because it is on the passenger side and when they leak the passenger floor becomes wet. It may also be a heater core gasket that is leaking but the heater...

Q: Car doesn't start even after jumpstart.

We need to determine if the engine is turning over or if nothing is happening when you turn the key. If it is turning over but not starting then you will need to check the ignition system or the fuels...

Q: All pipes and hoses are rusted and need replacing underneath car all around, I was quoted $900 in parts to replace. Worth it?

Investing money in an older car is a bit subjective. Some people would rather invest in keeping an older car running versus having new car payments. Others prefer having a newer car with the perception of better reliability and a...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...