2020 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.

The Stop/Start feature is enabled after every normal customer engine start. At that time, the system will go into STOP/START READY and if all other condi-

tions are met, can go into a STOP/START AUTOSTOP ACTIVE “Autostop” mode.

To Activate The Autostop Mode, The Following Must Occur:

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. Refer to “Instrument Cluster” in “Getting To Know Your Instrument Panel” for further information.

The vehicle must be completely stopped.

The shifter must be in a forward gear and the brake pedal depressed.

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

Refer to the “Stop/Start System” in the “Starting And Oper- ating” in this chapter for further information.

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. In the following situations, the engine will not stop:

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 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.

Other Factors Which Can Inhibit Autostop Include:

Accelerator pedal input.

Engine temp too high.

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

Steering angle beyond threshold.

ACC is on and speed is set.

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.

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

Conditions That Will Cause The Engine To Start Automat- ically While In Autostop Mode:

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.

Low brake vacuum (e.g. after several brake pedal applica- tions).

Stop/Start OFF switch is pushed.

A Stop/Start system error occurs.

4WD system is put into 4WD LOW mode.

Stop/Start Off Switch

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. Refer to “Instrument Cluster” in “Getting To Know Your Instru- ment Panel” for further information.

At the next vehicle stop (after turning off the Stop/Start system), the engine will not be stopped.

The Stop/Start system will reset itself back to an ON condi- tion every time the ignition is turned off and back on.

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

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. Refer to “Instrument Cluster Display“ in “Getting to Know Your Instrument Panel” for further information.

If the “SERVICE STOP/START SYSTEM” message appears in the instrument cluster display, have the system checked by an authorized dealer.