There's a light that appears only when my car is off. it's a red symbol of a little car with a padlock over it. what does this mean?

The yellow car and lock symbol that appears on the dashboard of your Pontiac G6 indicates that the vehicle's security system has detected a problem. This symbol may appear if there is a malfunction with the system or if the system has been triggered by an event such as a collision or attempted break-in.
If the security system is functioning properly and the yellow car and lock symbol is still displayed, it is possible that there is a problem with the security system sensor or wiring. It is recommended to take the vehicle to a mechanic or a Pontiac dealership for further diagnosis and repair.
In the meantime, you can try pressing the unlock button on the remote or using the key to unlock the doors and see if the symbol disappears. If the symbol remains displayed, it is possible that the security system will need to be reset by a professional.

This is your car immobilizer light

Security Lock ? What do you mean ? Anti-theft - car an padlock symbol or SECURITY light lit on instrument cluster ? If one of of these not you can do , need to take it to a qualified repair shop.

Is the security light lit - anti-theft ? symbol of car an a padlock . No fire ? you mean it has no spark ? Or it cranks an won't start an run ,which means you have no clue if it has spark from the ignition system . Battery Disconnect or Replacement Problems

What make vehicle ? Do you have a SECURITY light lit on the dash or a flashing red light , padlock an car symbol light lit ? If your having a anti-theft system advent your best to take to the dealer because the odds of it being a fuse is zip O .... Unless you have a factory scan tool forget it an have it towed to the dealer .

if you have a manual that came with your truck it should have all the icons and there meaning

check the manual and see what that indicator means, red is always bad.

does it have a nice little symbol in it ?? whats the symbol

SOUND PASS LOCK SECURITY PROBLEMS.MOST OF THE TIME WHEN YOU SEE PAD LOCK SYMBOL YOUR CAR WILL NOT CRANK.YOUR PASS KEY CYLINDER IS WORN OR THE CAR KEY IS WORN ENOUGH WHERE THE BCM AND PCM DONT RECOGNIZE IT THINKS IT THEFT..

The vehicle is equipped with a security system. The light means it is armed.