What will make a 2000 grand am not start but just crank

check for spark , fuel pressure and see if injectors are firing , fuel pressure may have to be correct ,too high or low and it may not run, same with spark

Them cars have a passlock module in switch when they go bad they won't start until you put it in bypass mode. You can put it in bypass mode by turning switch on and off 3 times the 3rd time leave it on watch security light if it starts blinking its in bypass mode it takes about 10 to 15 minutes for it to complete when the security light quits blinking turn switch off and turn it back on go to start it if it starts its passlock module in switch