What is DEF indicator?
The DEF (diesel exhaust fluid) light is a driver warning system that lets you know when your DEF tank is nearly empty. DEF is, essentially, a mixture that is added to the vehicle’s engine to reduce environmental harm by combining with the diesel gas.
How low can DEF get?
Does DEF Have a Low Freeze Point? The standard 32.5% solution of DEF will begin go crystallize and freeze at 12 F. The Urea and water in DEF, when mixed, will freeze at the same rate. This is beneficial to the user because when the fluid thaws the DEF solution does not become diluted or overly concentrated.
How many miles does a gallon of DEF last?
According to the owner’s manual, a full DEF tank should last 6,300 miles, but as everyone knows by now, your mileage will vary.
Can you run a diesel without DEF?
Modern trucks will not run without the DEF. Hence the need for diesel truck owners to check their fluid levels frequently. Reducing emissions should be everyone’s goal. Maintaining your vehicle would also reduce emissions and DEF consumption.
What happens if I run low on DEF?
In addition, they are equipped with a system of flashing lights to alert the operator well in advance when the DEF tank is getting low on fluid. If the reservoir is not replenished with DEF and runs low, vehicle speed will be limited, but as soon as DEF is added, the engine will resume normal speed levels.
What’s the low Def light on in my truck?
I just had my DEF doser and gasket replaced in my Freightliner M2. On the way home from the shop I did a test drive. Shortly after picking the truck up it started an active regen and about 5 minutes later the low DEF indicator lamp came on.
Is there a low Def warning with a 3 / 4 tank?
The ’12 T660 I’m in started this at 20K, and was low only one time. Finally it De-rated and got towed to the KW shop in Nashville. Turned out to be a sensor somewhere in the exhaust system. That was an early ’12, so you may not have to much trouble getting in and out of your dealer. Yeah, OK, good luck there!
How to check if DEF tank low indicator light is full?
Check your harness and connections at your sensor. you could possibly bypass the sensor for test purposes to see if the light goes out. Reply back if you need further help with this Customer: