Jeep Wrangler 2018-2026 Owners Manual / STARTING AND OPERATING / REFUELING THE VEHICLE — DIESEL ENGINE (IF EQUIPPED) / Diesel Exhaust Fluid / Diesel Exhaust Fluid Storage

Jeep Wrangler: Diesel Exhaust Fluid / Diesel Exhaust Fluid Storage

Diesel Exhaust Fluid (DEF) is considered a very stable product with a long shelf life. If DEF is kept in temperatures between 10° and 90°F (-12° and 32°C), it will last a minimum of one year.

DEF is subject to freezing at the lowest temperatures. For example, DEF may freeze at temperatures at or below 12°F (-11°C). The system has been designed to operate in this environment.

NOTE:

When working with DEF, it is important to know that:

Any containers or parts that come into contact with DEF must be DEF compatible (plastic or stainless steel). Copper, brass, aluminum, iron or non-stainless steel should be avoided as they are subject to corrosion by DEF.
If DEF is spilled, it should be wiped up completely.

System Overview

This vehicle is equipped with a Diesel Exhaust Fluid (DEF) injection system and a Selective Catalytic Reduction (SCR) catalyst to meet the emission requirements...

Adding Diesel Exhaust Fluid

The DEF gauge (located on the instrument cluster display) will display the level of DEF remaining in the tank. NOTE: Driving conditions (altitude, vehicle speed, load, etc...

Other information:

Jeep Wrangler 2018-2026 Owners Manual: Seat Belt Reminder Warning Light

This warning light indicates when the driver or passenger seat belt is unbuckled. When the ignition is first placed in the ON/RUN or ACC/ON/ RUN position and if the driver’s seat belt is unbuckled, a chime will sound and the light will turn on...

Jeep Wrangler 2018-2026 Owners Manual: Selec-Speed Control (SSC) — If Equipped

SSC is intended for off-road driving in 4WD Low only. SSC maintains vehicle speed by actively controlling engine torque and brakes. SSC has three states: Off (feature is not enabled and will not activate) Enabled (feature is enabled and ready but activation conditions are not met, or driver is actively overriding with brake or throttle application) Active (feature is enabled and actively controlling vehicle speed) Enabling SSC SSC is enabled by pushing the SSC switch, but the following conditions must also be met to enable SSC: The driveline is in 4WD Low...

Automatic Headlights — If Equipped, Lights-On Reminder

Automatic Headlights

This system automatically turns the headlights on or off according to ambient light levels. To turn the system on, rotate the headlight switch clockwise to the last detent for automatic headlight operation. When the system is on, the headlight time delay feature is also on. This means the headlights will stay on for up to 90 seconds after you place the ignition into the OFF position. To turn the automatic system off, move the headlight switch out of the AUTO position.