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 Exhaust3-5-Reverse and 4-5-6 Clutch Housing Assemble (6T40/45/50 - Gen 2) Automatic Transmission Unit
Table 1: 4–5–6 Clutch Piston InstallationTable 2: 4–5–6 Clutch Fluid Dam InstallationTable 3: 3–5 Reverse Clutch Plates InstallationTable 4: Reluctor Wheel and Piston InstallationTable 5: 4–5–6 Clutch Plates InstallationTable 6: Turbine Shaft Installation4–5–6 Clutch Piston Install ...