I have a 1996 chevy lumina and the security light came

EVAP solenoid control circuit YouTube

most likely the ignition key cylinder gotta get from dealer with ur vin

is the security light on when you try to start it

sound like pass key security system has failed
dealers the best bet

You have a chip on your key,Your ignition has wire that goes bad,You have to get a new ignition and key that has a new chip.

You need to check for power at the purple wire going to the solonoid while key is in the start position, if no juice then check starter relay-under hood- fuse ,and ignition switch

my lumina 1996 turns on the security light and 20 seconds after turns off the car. What can I do? Thanks!!!!!!!!!!!!!

check your inteior light switch. for a tempory fix remove the bulb

You will need to replace the valve body in the transmission.

you probably have a broken wire in the ignition that reads the resistance in the chip in the key. there are two wires that attach the ignition switch to the security system.I had the same problem and it can be easily fixed by putting a resister in place of the chip in the key.any garage that puts alarm systems in cars will be able to do this very easily and very economically.