Low DEF Level Warning Indications and Vehicle Consequences
for Emergency Vehicles
DEF Tank Level
Indicator
Lamps
Consequence Remedy
Above initial
warning threshold
(Over 25% full).
None. None. None.
Below initial warning
threshold (25% full).
DEF solid
None.
Add 1 gallon
(3.8L) DEF to
5 gallon (19.0L)
tank or 2 gallons
(7.6L) DEF to
10 gallon
(34.0L) tank.
Critical warning
threshold (20% full).
DEF
blinking
None.
First vehicle
consequence (15%
full).
DEF
blinking
/
Amber engine
solid
Vehicle speed
limited to
55 mph
(88 km/h).
*
Final vehicle
consequence
(Empty) and engine
intentionally shut
down (key off) or in
extended idle for
one hour.
DEF
blinking
/
Amber engine
solid
/
Red engine
solid
Vehicle speed
limited to
25 mph
(40 km/h).
**
Add 1 gallon
(3.8L) DEF to
5 gallon (19.0L)
tank or 2 gallons
(7.6L) DEF to
10 gallon
(34.0L) tank.
Allow the
system to prime.
*
The vehicle speed restriction is suspended during pump operation when
using any of the following engine control modes:
• Power take-off
• Remote power take-off
• Remote throttle
• SAE J1939–commanded pressure governor.
**
Those installations using a transmission tailshaft-driven power take-off
or pump during a stationary operation are also limited to 25 mph
(40 km/h) equivalent tailshaft speed during a final vehicle consequence.
122 Fuel and Refueling
2013 F-650/750 (f67)
Owners Guide gf, 2nd Printing, March 2013
USA (fus)
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