Dodge RAM 1500 2018 Diesel Supplement page 21

6. Instrument Cluster Display
• When the appropriate conditions exist, this display
shows the instrument cluster display messages. Refer
to "Instrument Cluster Display" in "Getting To Know
Your Instrument Panel" for further information.
7. DEF Gauge
• The DEF Gauge displays the actual level of Diesel
Exhaust Fluid in the DEF tank. Diesel Exhaust Fluid
(DEF) is required to maintain normal vehicle operation
and emissions compliance. If something is wrong with
the gauge, a DEF Warning Message or Malfunction
Indicator Light (MIL) will be displayed. More infor-
mation is available in the instrument cluster display
section under the heading of Diesel Exhaust Fluid
(DEF) Warning Messages.
NOTE:
• The DEF tank on these vehicles is designed with a large
amount of full reserve. So the level sensor will indicate a
full reading even before the tank is completely full. To put
it another way, there's additional storage capacity in the
tank above the Full mark that's not represented in the
gauge. You may not see any movement in the reading –
even after driving up to 2,000 miles in some cases.
GETTING TO KNOW YOUR INSTRUMENT PANEL 19
• The 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
your authorized dealer for service.
• The DEF gauge may also not immediately update after a
refill if the temperature of the DEF fluid is below 12F
(-11C). 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.
• 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.
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