Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-16504481) - 2023 - CRC - 9/26/22
30 Driving and Operating
Trailer Towing
For more information, see "Trailer Towing"
in the owner's manual for the vehicle.
When towing at higher altitudes, engine
coolant will boil at a lower temperature
than at lower altitudes. If the engine is
turned off immediately after towing at high
altitude on steep uphill grades, the vehicle
could show signs similar to engine
overheating. To avoid this, let the engine
run, preferably on level ground, with the
transmission in P (Park) and the parking
brake applied for at least five minutes
before turning the engine off. If the
overheat warning comes on, see Engine
Overheating 0 56.
Caution
Exhaust gases are very hot. To help
prevent damage to the trailer, install heat
shielding to any parts exposed to exhaust
gases.
Conversions and Add-Ons
Power Take-Off (PTO)
If equipped, the Power Take-Off (PTO) is a
GM Upfitter integrated system that creates
an auxiliary power source for running
add-on equipment, such as salt spreaders,
snow plows, winches, and lift buckets.
It controls engine speed to values higher
than normal base idle, PTO integral clutch
engagement, and remote starting and
shutdown of the engine.
PTO Switch
If equipped, there is an available PTO switch
in the auxiliary switchbank in one of the
right side positions.
When installing PTO aftermarket equipment,
the PTO wiring and operation
recommendations provided by the service
manual and GM Upfitter documentation
must be strictly followed.
Refer to the bulletins in the GM Upfitter
Integration website www.gmupfitter.com for
the PTO Operating Description and
Application Guide.
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Warning
Engine exhaust contains Carbon
Monoxide (CO), which cannot be seen or
smelled. Exposure to CO can cause
unconsciousness or even death. Never
operate PTO in an enclosed area such as
a garage or building that has no fresh air
ventilation. See “Engine Exhaust” in the
owner’s manual.
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