Engine Alarm And Automatic Shutdown - GMC 2003 GMT560 T-Series Owner's Manual

Cold Weather Starting
The following tips will help you get good starting in cold
weather.
Use the recommended engine oil when the outside
temperature drops below freezing. See Engine Oil
(DURAMAX™ Diesel) on page 5-9 . When the outside
temperature drops below 0°F (−18°C), use of the engine
coolant heater is recommended.
If you experience longer cranking times, notice an
unusual amount of exhaust smoke or are at higher
altitudes (over 7,000 ft. or 2 135 m), you may use your
engine coolant heater. See Engine Coolant Heater
on page 2-13 .
See What Fuel to Use on page 5-5 for information on
what fuel to use in cold weather.

Engine Alarm and Automatic Shutdown

If your vehicle has this feature, your check gages light
will come on if the system senses high engine
temperature or low engine oil pressure. If high engine
temperature or low engine oil pressure is detected, you
will also hear a tone alarm at two beats per second.
The alarm and the light will remain on until the condition
is fixed. If the engine temperature or oil pressure
condition worsens, the tone alarm will go to five beats
per second.
If the system senses low engine oil coolant, the alarm
and the low coolant warning light will come on.
The alarm means that your engine will shut down. See
Engine Shutdown Warning Light on page 3-31 for
more information.
Pull off the road and shut off the engine. Don't start it
until the vehicle is repaired. If the engine shuts
down when you are still in traffic, you can restart the
engine and get another 25–30 seconds of operation.
Notice: If you try to operate the vehicle after
the engine automatically shuts down, you may
damage the vehicle. Have your vehicle repaired as
soon as possible.
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