RAM 1500 2020 Owner's Manual page 296

294 STARTING AND OPERATING
Diesel Exhaust Fluid (DEF) Fill Procedure
NOTE:
Refer to "Fluids And Lubricants" in "Technical
Specifications" for the correct fluid type.
1. Remove cap from Diesel Exhaust Fluid
(DEF) tank (located on drivers side of the
vehicle or in fuel door).
DEF Filler Cap And Fuel Fill
1 — Diesel Exhaust Fluid (DEF) Fill Location
2 — Diesel Fuel Fill Location
2. Insert DEF fill adapter/nozzle into DEF tank
filler neck.
NOTE:
The DEF gauge may take up to five seconds

to update after adding a gallon or more of
Diesel Exhaust Fluid (DEF) to the DEF tank. If
you have a fault related to the 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 12°F (-11°C). The DEF line
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.
CAUTION!
To avoid DEF spillage, and possible

damage to the DEF tank from overfilling, do
not "top off" the DEF tank after filling.
DO NOT OVERFILL. DEF will freeze below

12ºF (-11ºC). The DEF system is designed
to work in temperatures below the DEF
freezing point, however, if the tank is over-
filled and freezes, the system could be
damaged.
CAUTION! (Continued)
When DEF is spilled, clean the area imme-

diately with water and use an absorbent
material to soak up the spills on the ground.
Do not attempt to start your engine if DEF is

accidentally added to the diesel fuel tank
as it can result in severe damage to your
engine, including but not limited to failure
of the fuel pump and injectors.
Never add anything other than DEF to the

tank – especially any form of hydrocarbon
such as diesel fuel, fuel system additives,
gasoline, or any other petroleum-based
product. Even a very small amount of these,
less than 100 parts per million or less than
1 oz. per 78 gallons (295 liters) will contam-
inate the entire DEF system and will require
replacement. If owners use a container,
funnel or nozzle when refilling the tank, it
should either be new or one that is has only
been used for adding DEF. Mopar provides
an attachable nozzle with its DEF for this
purpose.
(Continued)