Set alarm off. Car will not start.

Check for a hiden after market antistole module Under dash near steering colomb follow wire for a hiden cancel switch,you should have hit the switch by inadvertance

The alarm must of activated , the alarm is controlled by the locks, go to passenger door and use the key to lock and then unlock the door, this will shut down alarm, you may have to use the passenger door to shut down alarm due to a bad switch in drivers door, this will allow you to start the car, you can also not lock door and alarm may not arm. let me know if the passenger door lock works, good day.

shoud shut off by turning key in the ignition ... check the manual for your vehicle on how to resync your trasmitters

HOW DO I DISALRM ALRM CAR WONT START 04 IMPALA

you may have a bad door switch, theres a switch on the drivers door lock, when door is unlocked with fob or key the switch is activeated to shut alarm down,the lock moves to hit switch with key or fob,so if the switch is bad it will not shut down alarm, i would start there,door panel has to be remove,then latch has to be remove to get to switch, then test with a meter see if it opens and closes the connection, hope this helps.

This is the problem due to your anti theft alarm system. You have not mentioned which brand of anti-theft alarm system you have? Anyhow, most of the systems have a reset switch inside the kit, open the kit and on the main board, u will find the reset button, press that and hold for 5 sec, the system will be reset. Otherwise, there are 2 or 3 fuses with the wiring of kit, remove those fuses and ur engine will wake up but the anti-theft system wont work then, hope this will solve the problem

some alarms have kill switches, but most of them prevent the car from even starting. i would consider strongly getting the remote for the alarm or Completely disconnect the alarm module.

If the valet key is not programmed to the Immobilzer system, it should start the car, but it will shut off. This is only if the car has an Immobilizer system. If your locksmith unlocked the car without the door key, then use the key to unlock and disarm the alarm in the door. If you triggered the alarm, the starter will be disabled till a unlock signal from a remote or the door is actually unlocked with a key. If that cannot be done, your only solution right now is to tow it to the dealership and have them make a master key and check the door locks for proper lock/unlock commands so the alarm will arm and disarm correctly.

Do you have a chipped key {small black thing in the middle of the key} if not you need to take your registration into the dealer and order a new key.

try unhooking battery cable. hook back up and use key remote to unlock car and try to start if no remote use key to unlock