STOP/START SYSTEM — MANUAL TRANSMISSION (IF EQUIPPED)
The Engine Start/Stop System (ESS) is designed to reduce fuel consumption. The system will automatically stop the engine when the vehicle is stopped, if the required conditions are met. Pressing the clutch pedal will automatically restart the engine.
ESS-equipped vehicles have been upgraded with a heavy-duty starter, a reinforced battery, and other upgraded engine components to handle the additional engine starts. Vehicles equipped with eTorque contain a powerful motor-generator and an additional hybrid electric energy storage battery to store energy from vehicle deceleration for use in engine restarts after a stop, as well as to provide torque-assist starting.
NOTE:
It is recommended that the Stop/Start system be turned off when using the vehicle off-road.
Secondary Battery
Your vehicle may be equipped with a secondary battery, used to power the Stop/Start system and the 12-volt electrical system. The secondary battery is located behind the front passenger-side wheel.

Battery Location
- Main Battery
- Secondary Battery
Test yourself
A quick Jeep Wrangler quiz: every answer comes with an explanation and a link to the manual page.