Chevrolet’s Silverado range of pickup trucks may include a factory-supplied security system. The system consists of an antitheft alarm coupled with an immobilizer. The alarm is operated with the vehicle’s remote transmitter, and the immobilizer is automatically, passively armed when the key is removed from the ignition. Problems with the two elements can include issues with keys and transmitters, and the system's not working as expected. These kinds of problems can be rectified through troubleshooting.
Use the remote transmitter to operate the alarm system if the 10-second pre-alarm is activated when you open the locked driver’s door with a key. The pre-alarm is telling you that you need to place the key in the ignition and turn it to the “Start” position. The pre-alarm consists of a chirping horn and flashing lights.
Change the batteries in the transmitter if the button presses don’t activate or turn off the alarm system, or if the doors don’t lock and unlock. Separate the transmitter by inserting a flat-head screwdriver along the center line and twisting. Insert a new battery.
Make sure that you are using the correct key, and turn the ignition off and try again if the engine won’t start and the security light comes on the instrument panel. The immobilizer works by starting the vehicle only with a key matched to the ignition electronically. Keep gasoline pass keys and other electronic payment keys away from the Chevy key to avoid interference. Try another ignition key, or have a new key programmed if you continue to run into problems.
