STARTING AND OPERATING 169 DEF is subject to freezing at the lowest temperatures. For example, DEF may freeze at temperatures at or below 12°F (-11°C). The system has been designed to operate in this environment. There is an electric heater inside the DEF tank that automatically works when necessary. If the DEF supply does freeze, the truck will operate normally until it thaws. DEF system, the gauge may not update to the new level. See an authorized dealer for service. The DEF gauge may also not immediately update after a refill if the temperature of the DEF fluid is below 39°F (4°C).
The DEF tank heater will possibly warm up the DEF fluid and allow the gauge to update after a period of run time. Under very cold conditions, it is possible that the gauge may not reflect the new fill level for several drives. DEF FILL PROCEDURE NOTE: When working with DEF, it is important to know that: NOTE: For the correct fluid type Ъ page399. Remove cap from DEF tank (located on drivers side of the vehicle or in fuel door). Any containers or parts that come into contact with DEF must be DEF compatible (plastic or stainless steel). Copper, brass, aluminum, iron or non-stainless steel should be avoided as they are subject to corrosion by DEF.
At 40°F (4°C) you could see some increase in the DEF gauge due to the tank thawing. The gauge and level sensor are working properly and are just updating with proper thawed DEF. 4 If DEF is spilled, it should be wiped up completely. Adding Diesel Exhaust Fluid (DEF) Excessive overfilling of the DEF tank can result in a MIL lamp/fault code and inaccurate level readings. The DEF gauge (located on the instrument cluster) will display the level of DEF remaining in the tank Ъ page81. Refilling With Nozzles You can fill up at any DEF distributor. NOTE: DEF Filler Cap And Fuel Fill Chassis Cab Models Proceed as follows:
Driving conditions (altitude, vehicle speed, load, etc.) will effect the amount of DEF that is used in your vehicle. 1 — Diesel Exhaust Fluid (DEF) Fill Location 2 — Diesel Fuel Fill Location Insert the DEF nozzle in the filler tube, start refilling and stop refilling at the first shut-off (the shut-off indicates that the DEF tank is full). DO NOT proceed with the refilling, to prevent spillage of DEF. Another factor is that outside temperature can affect DEF consumption. In cold conditions, 12°F (-11°C) and below, the DEF gauge needle can stay on a fixed position and may not move for extended periods of time. This is a normal function of the system. NOTE:
The DEF gauge may take up to five seconds to update after adding a gallon or more of DEF to the DEF tank. If you have a fault related to the Extract the nozzle.