What Happens When You Run Out Of Diesel Exhaust Fluid

What happens if you run out of diesel exhaust fluid.

The reason they give you ample warning is that if you run out of diesel exhaust fluid completely then the consequences can leave you stranded. Used properly def is a good thing but used improperly it can cause serious and seriously expensive problems. You will get a lot of warnings to refill the def tank before you run out. In most vehicles before you run out completely the diesel truck will start running on a lower power mood.

This affects truck drivers more than it does drivers of passenger vehicles. Diesel exhaust fluid is used to reduce nox emissions. Def is essentially a mixture that is added to the vehicle s engine to reduce environmental harm by combining with the diesel gas. Diesel exhaust fluid is formulated with 32 5 percent urea and 67 5 percent deionized water.

In storage or when the engine is not in use def will freeze at 12 f 11 c. Also known as aus 32 and marketed as adblue is a liquid used to reduce the amount of air pollution created by a diesel engine. Back in the september 2014 issue of diesel world we talked about diesel exhaust fluid def which is used as an exhaust treatment in modern diesel emissions systems to reduce the levels of nitrogen oxide nox in the exhaust. It can be just like you ran out of diesel gas in your truck.

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Not to much further and action required message pops up with exhaust fluid empty refill now message alternating with 500 miles til 65 mph max speed. If you decide to ignore the warnings or the circumstances do not allow tank refill the engine is designed to limit its power and fuelling dramatically. Diesel exhaust fluid def. Inside the exhaust pipe the def vaporizes and decomposes into ammonia and carbon dioxide.

Specifically def is an aqueous urea solution made with 32 5 urea and 67 5 deionized water def is consumed in selective catalytic reduction scr that lowers the concentration of nitrogen oxides no. This does two things. For sure i hadn t traveled the 78 miles yet and it was 55 60 mph flat running so shouldn t have been using at a higher than typical rate. At this concentration level the urea and the water freeze and thaw at the same rate ensuring that you always have the correct amount of each.

The def diesel exhaust fluid light is a driver warning system that lets you know when your def tank is nearly empty.