2021 GMC Sierra 1500 Owner’s Manual — Engine Exhaust
Driving and Operating
It is better not to park with the engine running.
If the vehicle is left with the engine running, follow the proper steps to be sure the vehicle will not move. See Shifting Into Park 0 234 and
Engine Exhaust 0 237.
If parking on a hill and pulling a trailer, see
Driving Characteristics and Towing Tips
0 287.
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