Borrow, rent or buy an automotive code scanner and see what it says. Most likely you'll be getting something like a low voltage warning, but when the light comes on like that it's telling you that there's a problem. When the light goes out the computer thinks the problem is solved.
I'd suspect the battery but I'd also connect the code scanner before I replace anything.
.You can reset the antitheft system, on your 2003 Chevrolet Cavalier, by removing the fuse. Keep the fuse out for 10 seconds. Replace the fuse to its original slot
The easiest way to reset your 1998 Chevrolet Cavalier theft system is to remove the fuse. Keep the fuse out for 10 seconds and replace it to its original slot.
The duration of The Gay Cavalier is 1800.0 seconds.
crank senser....
Turn the ignition switch to the auxiliary position. Do not start the engine. Leave the ignition switch in the auxiliary position for 30 seconds. This will reset your alarm system.
restart the video or rewind for 5 seconds to 10 seconds then play
The duration of The Chevrolet Tele-Theatre is 1800.0 seconds.
5 seconds
Get the Engine Checked Don't waste your money getting your engine checked. Just disconnect your negative side of your battery for 10 seconds. Reconnect it and your done, no more check engine light.
Hold the center button and the menu button for about five seconds.
Chevrolet Cobalt SS Supercharged = 14.6 seconds Chevrolet Cobalt SS (Non Supercharged 2.4L motor) = 15.6 seconds Chevy Cobalt LS Sedan (Auto) = 16.6 seconds
Between 4.5-5 seconds