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 Exhaust#07-03-10-015C: General Motors New Vehicle Wheel Warranty Coverage - (May 17, 2013) Wheels
Subject:General Motors New Vehicle Wheel Warranty CoverageModels: 2014 and Prior GM Passenger Cars and Light Duty Trucks This bulletin is being revised to add the 2013-2014 model years and remove the SaabWarranty Information. Please discard Corporate Bulletin Number 07-03-10-015B.The General Mot ...