Possible reasons the engine does not stop automatically

Before stopping the engine, the system checks many safety and comfort conditions to see if they are met. Detailed information on Stop/Start system operation may be displayed on the Stop/Start screen in the instrument cluster display. Situations in which the engine will not stop include (but are not limited to):

• The driver's seat belt is not fastened.
• The driver's door is not closed.
• Battery temperature is too high or too low.
• The battery charge is low.
• The vehicle is on a steep grade.
• Cabin heating or cooling is in progress and the desired cabin temperature has not been reached.
• The gear selector is in MANUAL (M) mode.
• HVAC is set to full defrost at high fan speed.
• HVAC is set to MAX A/C.
• The engine has not reached normal operating temperature.
• Engine temperature is too high.
• The transmission is not in a forward gear.
• The hood is open.
• The transfer case is in 4WD Low or N (Neutral).
• The brake pedal is not pressed with sufficient force.
• Accelerator pedal input.
• The vehicle speed threshold has not been reached since the previous Autostop.
• Steering angle is above the threshold (ESS models only).
• ACC is on and a set speed is selected.
• The vehicle is at high altitude.
• A system malfunction is present.

The vehicle may be driven several times without the Stop/Start system entering the STOP/START READY state under more extreme conditions than those listed above.