It is better not to park with the vehicle running. If the vehicle is left while running, follow the proper steps to be sure the vehicle will not move and there is adequate ventilation.
See Shifting Into Park and Engine Exhaust.
If the vehicle is left parked while running and the Remote Keyless Entry (RKE) transmitter is outside the vehicle, the vehicle will turn off after one hour. If the vehicle is left parked while running and the RKE transmitter is inside, the vehicle will turn off after two hours.
The timer will reset if the vehicle is taken out of P (Park) while it is running.
Shifting out of Park
Engine ExhaustHorns System Description and Operation Horn
System DescriptionThe horn system consists of the following components:HORN fuseUnderhood fuse block (contains PCB horn relay)Horn switchHorn-low noteHorn-high noteBody control module (BCM)K84Keyless Entry Control ModuleS33Horn SwitchK73Telematics Communication Interface Control ModuleK9Body Control ...