probably your security system . Search google for "Bypass GM Vats Security"
How to bypass security system on 1990 Chevy camaro
Short answer is you don't. Get the unit towed to a GM dealer for repair if required. The pass key system is integrated into the engine management computer and is nearly impossible to bypass successfully.
The easiest way to bypass your 1998 Chevy Cavalier factory security system is to remove the fuse. The security system fuse can be found in the fuse box.
1999 Chevy lumina, won't start, security light comes on ,can jump the starter but motor will only run for a short time , strong battery ? tried different keys , no good ? help
schematic of 1998 chevy lumina ltz 3.8l air conditioner
How do I change the clock setting on a 1997 Chevy Lumina with a CD stereo system?
when i got into the car to start it it wouldn't even try nothing it had power to everything else and a new battery it just flashed security what can i do to disarm the security system
Cant Its in the computer that runs the engine The vats system can be bypassed by matching the resistance in the key chip.
Clean the resister on the key with alchohol, dry and try to start the car.
Chevy Lumina has not the carborator.