See also:

Extreme Cold Weather (Below –20°F Or 29°C)
To ensure reliable starting at these temperatures, use of an externally powered electric engine block heater (available from your authorized dealer) is recommended. ...

Parksense System Usage Precautions
NOTE: • Ensure that the rear bumper is free of snow, ice, mud, dirt and debris to keep the ParkSense system operating properly. • Jackhammers, large trucks, and other vibrations could affe ...

SAFETY
The 2011 Grand Cherokee has been named a Top Safety Pick by the Insurance Institute for Highway Safety. To earn this safety nod, a car must receive the top score of Good in front-, side-impact, re ...