Tiffin Motorhomes PowerGlide 2019, Owner'S Manual

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C U M M I N S E N G I N E S
4-11
NOTE: The HEST lamp does not signify the need for any kind of vehicle or engine service; it
merely alerts the vehicle operator to high exhaust temperatures, it will be common for the HEST
lamp to illuminate on and off during normal vehicle operation as the engine completes regeneration.
Diesel Exhaust Fluid (DEF) Lamp
The DEF lamp is amber, and looks similar to this:
The DEF lamp indicates, when illuminated or flashing, that the diesel exhaust fluid level is low.
Diesel Exhaust Fluid (DEF) Lamp (cont.)
An illuminated DEF lamp indicates that the DEF level has fallen below the initial warning level. This can
be corrected by filling the DEF tank with diesel exhaust fluid.
NOTE: It is recommended that the DEF tank be filled completely full of diesel exhaust fluid in order to
correct any fault conditions.
A flashing DEF lamp indicates that the DEF level has fallen below the critical warning level. This can be
corrected by filling the diesel exhaust fluid tank with diesel exhaust fluid.
NOTE: It is recommended that the DEF tank be filled completely full of diesel exhaust fluid in order to
correct any fault conditions.
A flashing DEF lamp combined with an illuminated WARNING or CHECK ENGINE lamp indicates
that the DEF level has fallen below the initial derate level. The engine power will be limited automatically.
This can be corrected by filling the DEF tank with diesel exhaust fluid.
NOTE: It is recommended that the diesel exhaust fluid tank be filled completely full of diesel exhaust
fluid in order to correct any fault conditions.
If the engine has been shut down, idled for 1 hour, or if fuel has been added after the DEF tank has been
emptied, the STOP ENGINE lamp will also illuminated along with the flashing DEF lamp and
illuminated CHECK ENGINE lamp. The engine vehicle speed will also be limited to 5 mph.
NOTE: In order to remove the 5 mph speed limit, the diesel exhaust fluid tank must be filled to at least
10 percent volume of the tank.
NOTE: It is recommended that the DEF tank be filled completely full of diesel exhaust fluid in order to
correct any fault conditions.