If you do happen to run out of DEF while driving a Frazer, the good news is that you’ll still have access to independent, unrestrained generator power. So you should always maintain a proper DEF level in your vehicle. Regardless of the chassis, an empty DEF tank can activate the service mode and slow you down. ChassisĪ message is displayed in the message center when DEF level is low.ĭEF warning bar illuminates amber when DEF tank is very low Ford will be reduced to 50 MPH, but tampering with or disabling the exhaust system will cause the speed to dip to 5 MPH. A Chevrolet vehicle will be limited to 55 MPH at first and ultimately to 4 MPH. In a Chrysler product, such as a Dodge Ram, the speed drops to 5 MPH. This speed limit can vary from chassis to chassis. If the messages are ignored, a speed restriction protocol kicks in. Most vehicles will show several warnings to signal a low DEF tank. It should be extremely difficult to run out of DEF, given the ample warning strategies utilized in a modern fleet. Having an appropriate supply reduces emissions and extends refill intervals. Consequently, several engine manufacturers adopted selective catalytic reduction technology, which uses DEF to convert toxic nitrogen oxides into harmless nitrogen gas.ĭiesel exhaust fluid is stored in a special tank on board the chassis. In January 2010, the Environmental Protection Agency (EPA) introduced a DEF requirement for most diesel vehicles. SCR is a process that uses DEF to reduce emissions by cutting down on the amount of nitrogen oxides released into the air. This is where the aforementioned selective catalytic reduction comes into play. Nitrogen oxides are harmful air pollutants. But it also combines with nitrogen in the exhaust stream to create nitrogen oxides. The excess oxygen creates more heat, which burns the soot. This gives them a high air-to-fuel ratio. Soot is a harmful air pollutant, so modern diesels are designed to run lean. It’s used in Selective Catalytic Reduction (SCR) to help lower diesel exhaust emissions.ĭiesel engines create soot during the combustion process. Diesel exhaust fluid, however, is odorless and colorless. Some prefer the term “DEF” because urea sounds like a different type of fluid - the stinky kind. DEF is basically an industry term for aqueous urea. Diesel Exhaust Fluid (DEF) is a chemical compound that combines high purity urea with deionized water.
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