2021 Jeep Grand Cherokee Owners Manual - STOP/START SYSTEM — IF EQUIPPED

STOP/START SYSTEM — IF EQUIPPED

The Stop/Start function is developed to reduce fuel consumption. The system will stop the engine automatically during a vehicle stop if the required conditions are met. Releasing the brake pedal or pressing the accelerator pedal will automatically re-start the engine.

This vehicle has been upgraded with a heavy duty starter, enhanced battery, and other upgraded engine parts, to handle the additional engine starts.

AUTOSTOP MODE

The Stop/Start feature is enabled after every driver ignition start. At that time, the system will go into STOP/START READY.

The system must be in STOP/START READY state. A STOP/START READY message will be displayed in the instrument cluster display within the Stop/Start section page 81.

driving conditions are safe, pull over and let the

The vehicle must be completely stopped.

Alternate electric power steering efforts can be selected through the Uconnect System

page 171.

vehicle idle for a few moments until the icon and message turn off.

The gear selector must be in DRIVE (D) and the brake pedal pressed.

The engine will shut down, the tachometer will move to the zero position and the Stop/Start telltale will illuminate indicating you are in Autostop. Customer settings will be maintained upon return to an engine running condition.

POSSIBLE REASONS THE ENGINE DOES NOT AUTOSTOP

Prior to engine shut down, the system will check many safety and comfort conditions to see if they are fulfilled. Detailed information about the operation of the Stop/Start system may be viewed in the instrument cluster display Stop/ Start Screen. Situations when the engine will not stop, include (but not limited to):

Driver’s seat belt is not buckled.

Driver’s door is not closed.

Battery temperature is too warm or cold.

Battery charge is low.

The vehicle is on a steep grade.

Cabin heating or cooling is in process and an acceptable cabin temperature has not been achieved.

HVAC is set to full defrost mode at a high blower speed.

HVAC is set to MAX A/C.

Engine has not reached normal operating temperature.

The transmission is not in a forward gear.

Hood is open.

Vehicle is in 4WD LOW transfer case mode.

Brake pedal is not pressed with sufficient pressure.

Engine temp too high.

5 mph (8 km/h) threshold not achieved from previous AUTOSTOP.

Accelerator pedal input.

Steering angle beyond threshold.

Vehicle at a higher altitude.

Ambient temperature is outside operating range.

Gear selector in MANUAL (M) mode.

Stop/Start related system malfunction.

It may be possible for the vehicle to be driven several times without the Stop/Start system going into a STOP/START READY state under more extreme conditions of the items listed above.

TO START THE ENGINE WHILE IN

AUTOSTOP MODE 4

While in a forward gear, the engine will start when the brake pedal is released or the throttle pedal is pressed. The transmission will automatically re-engage upon engine restart.

The transmission selector is moved out of DRIVE.

To maintain cabin temperature comfort.

HVAC is set to full defrost mode.

HVAC system temperature or fan speed is manually adjusted.

Battery voltage drops too low.

Stop/Start OFF switch is pushed.

Stop/Start related system malfunction.

4WD system is put into 4WD LOW mode.

TO MANUALLY TURN OFF THE STOP/ START SYSTEM

Push the Stop/Start OFF switch (located on the switch bank). The light on the switch will illuminate. The “Stop/Start OFF” message will appear in instrument cluster display within the Stop/Start section, and the autostop function will be disabled page 81.

The Stop/Start system will reset itself back to an ON condition every time the ignition is turned OFF and back ON.

TO MANUALLY TURN ON THE STOP/ START SYSTEM

Push the Stop/Start OFF switch (located on the switch bank). The light on the switch will turn off.

SYSTEM MALFUNCTION

If there is a malfunction in the Stop/Start system, the system will not shut down the engine. A “SERVICE STOP/START SYSTEM”

message will appear in the instrument cluster display page 88.

If the “SERVICE STOP/START SYSTEM”

message appears in the instrument cluster display, have the system checked by an authorized dealer.

If a malfunction occurs during an autostop, the vehicle may not auto start and will need a key start.