An Unfamiliar but Important Gauge - 2014 Ram 1500 EcoDiesel Long-Term Road Test

2014 Ram 1500 EcoDiesel Long-Term Road Test

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2014 Ram 1500 EcoDiesel: An Unfamiliar but Important Gauge

May 19, 2014

2014 Ram 1500 EcoDiesel

This unfamiliar gauge in our new 2014 Ram 1500 EcoDiesel is an important one. Much like the diesel fuel gauge, if the DEF goes to 0% the truck won't start. So what is it?

DEF stands for Diesel Exhaust Fluid. It's injected into the exhaust stream to help this truck pass emissions requirements. Without it, the 3.0-liter EcoDiesel engine is illegal to run.

Thankfully, it doesn't run out nearly as quickly as diesel fuel. We have nearly 2,500 miles on the truck and it's not even to 50%. Top it off at each oil change and you would probably be fine.

According to the owner's manual, there are a series of warning lights that come on to remind you that the truck won't start if the DEF reaches zero. That should be enough to get even the biggest procrastinator to the dealer on time.

Ed Hellwig, Executive Editor @ 2,489 miles

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