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.


  • 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 2018-2024 Owners Manual: Care And Maintenance

    Do not press the touchscreen with any hard or sharp objects (pen, USB stick, jewelry, etc.), which could scratch the surface. Do not spray any liquid or chemicals directly on the screen! Use a clean and dry microfiber lens cleaning cloth in order to clean the touchscreen...

    Jeep Wrangler 2018-2024 Owners Manual: How To Use Remote Start

    If applicable, refer to the “Hybrid Supplement” for additional information. Push and release the Remote Start button on the key fob twice within five seconds. The vehicle doors and swing gate will lock, the turn signals will flash twice, and the horn will chirp twice...


    Remote Start system

    Jeep Wrangler. Remote Start system This system uses the key fob to start the engine conveniently from outside the vehicle while still maintaining security. The system has a range of approximately 300 ft (91 m).

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