Q: Security light on car wont start

asked by on March 22, 2017

Security light on car won't start

Try another key if you have one. If the vehicle starts, then the first key is bad. The keys have a transponder in it that the ignition switch reads and allows the car to start. If you do have a second key and it does not start with either, try this relearn procedure:

The Passlock family has two basic relearn procedures—a ten-minute procedure and a thirty-minute procedure. Which one you use depends on the system and what components have been replaced.

The ten-minute procedure involves trying to start the engine. If nothing happens or the engine starts and dies, the security light will be flashing. Wait ten minutes. The flashing light should go off or illuminate without flashing. When it does, turn the ignition off, wait twenty seconds, and then try to start the engine. If it starts and runs, everything is okay. If you get the same result as previously—nothing happens or the engine starts and dies with the security light flashing—wait ten more minutes then see below.

You will now begin the thirty-minute relearn procedure, which is just the ten-minute procedure repeated three times. After turning the ignition off for the third time and waiting for twenty seconds, the engine should start and run. If it doesn’t, there may still be something wrong with the system.

After the learn procedure is completed and the engine is running, the security light may stay on steady for a few minutes and then go off—this is normal. Depending on the system, replacement of key components will necessitate that a relearn procedure be completed.

If this does not work, then your local dealership will have to perform further diagnosis as the ignition lock cylinder, Powertrain Control Module (PCM), Body Control Module (BCM), or Instrument Panel Cluster (IPC) can all be possible causes.

Was this answer helpful?
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

Get a quote

What others are asking

My housing holes on my 2013 chevy Cruze bust and overheated now it will not start

Anytime an engine is overheated then you may damage internal engine components. Since you state the engine is seized then you may have blown a head gasket and one of the cylinders are full of coolant causing the engine to...

I put the wrong key in my car and a few weeks later my car just shut down and it will not start I believe it's the computer but...

Hi there. What had happened is the wrong key set the security to the vehicle. This is to prevent the vehicle from starting with the wrong keys. Try removing the battery cables (+) and (-) for 13 minutes. During that...

Car accelarates to 3000 rpm in park or neutral.

The throttle position sensor (TPS) is most likely failing. Air leaks in the intake can also generate a high idle, but not usually this high. If you need to have this checked, have a local mechanic, like one from YourMechanic,...

Related articles

Understanding Chevrolet Oil-Life Monitor (OLM) System and Lights
Car symbols, or dashboard lights, are a car service reminder. The Chevrolet Oil Light Monitor system indicates when and what service your car needs.
The Best Used Cars to Buy If You’re Single
When When you’re buying a vehicle that needs to meet the requirements of all kinds of passengers the process can prove to be rather tricky. However, if you happen to be single, you’re the one in control, and your list...
The Top 5 Selling Cars in Georgia in 2012
Georgia Georgia offers drivers a mild climate with very little snow, but rain is a major factor. Previous best-selling cars in the area, such as the Escape, Fusion and Camry, have shown that residents prefer a mix of both SUV...