Jeep Wrangler: Diesel Exhaust Fluid / 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.

The DEF injection system consists of the following components:

  • DEF tank
  • DEF pump
  • DEF injector
  • Electronically-heated DEF Lines
  • NOx sensors
  • Temperature sensors
  • SCR catalyst

The DEF injection system and SCR catalyst enable the achievement of diesel emissions requirements; while maintaining outstanding fuel economy, drivability, torque and power ratings.

NOTE:

  • Your vehicle is equipped with a DEF injection system. You may occasionally hear an audible clicking noise from under the vehicle at a stop. This is normal operation.
  • The DEF pump will run for a period of time after engine shutdown to purge the DEF system. This is normal operation and may be audible from the rear of the vehicle.

    Diesel Exhaust Fluid

    Your vehicle is equipped with a Selective Catalytic Reduction (SCR) system to meet the very stringent diesel emissions standards required by the Environmental Protection Agency...

    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...

    Other information:

    Jeep Wrangler 2018-2025 Owners Manual: Gear Ranges


    Do not press the accelerator pedal when shifting out of PARK or NEUTRAL. NOTE: After selecting any gear range, wait a moment to allow the selected gear to engage before accelerating. This is especially important when the engine is cold. PARK (P) This range supplements the parking brake by locking the transmission...

    Jeep Wrangler 2018-2025 Owners Manual: Service 4WD Warning Light — If Equipped


    This warning light will illuminate to signal a fault with the 4WD system. If the light stays on or comes on during driving, it means that the 4WD system is not functioning properly and that service is required. We recommend you drive to the nearest service center and have the vehicle serviced immediately...

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