order for your vehicle to comply with U.S. Environmental Protection Agency (EPA)
emissions regulations.
Diesel Exhaust Fluid (DEF) Lamp
Illuminated
An illuminated DEF Lamp is an indication that the DEF level is low. This can be corrected
by refilling the DEF tank with Diesel Exhaust Fluid.
Flashing
A flashing DEF Lamp indicates that the DEF level has fallen below a critical level. This can
be corrected by refilling the DEF tank.
Flashing DEF Lamp With Check Engine Lamp / Amber Warning Lamp
A flashing DEF Lamp combined with an illuminated Check Engine Lamp / Amber Warning
Lamp indicates that the DEF level is critically low and you will experience a power loss.
Normal engine power will be restored after refilling the DEF tank.
Flashing DEF Lamp With Check Engine Lamp / Amber Warning Lamp and Stop Engine Lamp
When your DEF gauge reads zero and the engine has been shut down, has idled for one
hour after the DEF tank has been run dry or if the vehicle's diesel fuel tank is refilled without
refilling the DEF tank, the Stop Engine Lamp will also be illuminated, along with the flashing
DEF Lamp and the illuminated Check Engine Lamp / Amber Warning Lamp. Engine power
will continue to be reduced automatically. The vehicle will also be limited to a speed of 5
miles (8 km) per hour. Normal engine power and vehicle speed will be restored after refilling
the DEF tank.
Diesel Particulate Filter (DPF)
The DPF is an integral component of the aftertreatment system on every 2007 and newer
vehicle. It captures Particulate Matter (PM) in a wall-flow ceramic filter. The exhaust system
periodically undergoes regeneration, raising temperatures to oxidize captured PM and
clean the system. Lamps alert the driver when a regeneration is needed.
High Exhaust System Temperature (HEST) Lamp
T300-1_T500-1_T780
Operating Instructions
214 P/N 12261-683
REVISED: January 2015
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