Jeep 2014 Grand Cherokee Limited key question, see below for detailed question.

From the shop manual: "The Sentry Key Immobilizer System (SKIS) is designed to provide passive protection against unauthorized vehicle use by disabling the engine after about two seconds of running whenever any method other than a valid Sentry Key FOB with Integrated Key (FOBIK) is used to start the vehicle. " That said, I don't know that the vehicle stalls out in 2 seconds. This is all I would suggest: 1) leaving your vehicle running while unlocked and unattended even without the key fob is not advisable and is not a method of preventing vehicle theft 2) It is not advisable to attempt driving the vehicle without the fob, as it will become unresponsive -- regardless of when. Hope this helps.