Pass key fault - 1996 Chevrolet Impala SS

Get a second ignition key, the one you are using is dirty or moisted, you need to turn on and off the car witha clean key, hapens to me once in a while.!!

Ya, this is a common and potentially expensive problem on GM vehicles like your cadillac. Go to this link for a rundown of how the system works and ways to fix it yourself

http://vatspasslockpasskeysecurityhelp.yolasite.com/

PASS KEY PROBLEM IS CAUSED BY FAULTY IMMOBILIZER READ COIL IN IGNITION SWITCH AND KEY LOCK CYLINDER OR THE KEY WORN OUT OR FAULT IN THE IMMOBILIZER CONTROL MODULE.

My light stays on

there is a micro chip inside the head of the igntion key, when you put the key in the igntion the sensor inside the steering colunm will read the resistance of the micro-chip. If there is a match the engine will start. If for some reason the sensor will not read the micro chip the system will think some is stealing the car. I would try another key 1st, if this persist, the module will need to be replaced. Start with a new key, its cheaper.
You'll need to go a GM store parts departement with the old key, drivers license & registration for the dealer to cut a new key.

i had the same prob in my 94 the ignition cylinder is bad change the ignition and i swear it will work perfect

WELL I HAD THE SAME PROB. ON A 95 CHEVY CAPRICE.I REMOVED THE IGNITION AND THE WIRE WAS BROKE.WHEN U TURN THE KEY THE PASS KEY WIRE TURNS WITH THE IGNITION,WHAT A FAULTY DESIGN.ANY HOW BUY A NEW IGNITION AND KEY THAT SHOULD SOLVE THE PROB. GOOD LUCK

If the car starts and dies right away you may have a pass key sensor fault.
Try to start the car,if the car dies right away just leave the key on and watch the security light in the insturment panel,if it begins to blink leave the key on until it stops blinking (apx 10 mins.) this will reprogram the pass lock to the pcm and may solve all your problems.if the car continues to die after running a min or so then you may have other faults,or if the car dies right after start the pass lock sensor may need to be replaced.

Please dont forget to rate this solution

NO, check oil pressure module. Bad module (red ligh of check engine on) or a bad cable can interrupt the fuel pump voltage. This is a security to device to induce car to turn off when the oil pressure drop near 0. and to protect the wholee engine

that means than your antitheft system is not operating right,
if your car has a tilt wheel steering system most likelly you need to replace the ignition lock cylinder
this will be also with intermitant wont star simptom