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Because the SECURITY light is a warning indicator for the ant-theft system . If the light is lit the PCM - engine computer disables the fuel injectors an or in some cases the starter . Your best bet have it towed to a qualified repair shop .
unhook battery 15 min hook back on lower driver window put key on ignition just bump the engine and wait until security lit stop flashing turn key off do it again 3 times once lit goes off crank engine an should start if lit wont go away or flash while cranking you have a security issue at switch or bcm now need a scanner capable to look at the security data
If it is a warning light shaped like a door key, it could be the warning light for the security system. Its telling you there is a problem with the chip in your key or the sensor in the lock cylinder. Your owner's manual should show all of the warning lights and what they mean.
A yellow explanation point symbol on the dashboard typically applies to the Tire Pressure Monitoring system. A thick ! inside a half drawn flat tire symbol to be complete and comes in yellow color when lit. Under normal vehicle set-up, if this indicator stays lit after the power-on selftest, you need to check your tires for any uneven pressures and adjust their pressures to correct specifications. Okay? : )
A red exclamation point inside a circle when lit indicates your parking brake is on, or your brake fluid level is low.
This light shows operational status of traction
control system. If it is constantly lit when engine is running, this
means that traction control system is off. If the light flashes during
driving, it means the loss of traction at the wheels, and traction
control system is operating- decreasing engine torque to stop exessive
That means the factory security is not arming, not being set. ( i.e. a door is not completely closed or the trunk/door lock has been vandalized ) It could be for other reasons but first check the obvious