Diesel Exhaust Fluid; Roadside Assistance; Program - GMC Terrain 2018 Owner's Manual

Cleaning the DPF (Exhaust
Filter)
While the DPF cleaning is
automatically controlled by the
engine computer, the vehicle will
need to operate continuously for
approximately 25 minutes and at
speeds greater than
50 km/h (30 mph) to clean the DPF
effectively.
Special DPF Driver Messages
If the vehicle is used for numerous
short trips or extended slow-speed
operation, the engine computer may
not be able to clean the DPF
effectively. If this happens, a Driver
Information Center (DIC) message
will display.
If the vehicle continues to be driven
in a manner that prevents effective
DPF cleaning, the DPF will become
plugged. If this occurs, the engine
computer will turn on the
malfunction indicator lamp in the
instrument cluster and a DIC
message will display.
See Diesel Particulate Filter 0 193,
Fuel for Diesel Engines 0 233 and
Engine Oil 0 263.

Diesel Exhaust Fluid

Diesel Exhaust Fluid (DEF) is used
with diesel engines to reduce the
amount of regulated emissions
produced. The DEF system must be
maintained for the vehicle to run
properly. It is normal to hear the
DEF system purge fluid back into
the tank after the vehicle is shut off.
Locating Diesel Exhaust Fluid
DEF can be purchased at a GMC
dealer. It can also be purchased at
authorized vehicle dealerships.
Additionally, some diesel fueling
stations or retailers may have DEF.
For vehicles with an active OnStar
subscription, OnStar can help to
locate a DEF retailer. See Customer
Assistance Offices 0 363 for phone
numbers to assist you in contacting
a GM dealer. See Recommended
Fluids and Lubricants 0 353.
In Brief
As the DEF tank becomes low on
fluid, warnings begin with
approximately 1 600 km (1,000 mi)
of remaining range. These warnings
will increase in intensity as the tank
becomes empty. Once the tank is
empty, the vehicle speed will be
limited. If there is an issue with the
quality of the fluid or the exhaust
fluid system, warnings will be
displayed in the Driver Information
Center (DIC). See Diesel Exhaust
Fluid 0 194.

Roadside Assistance

Program

U.S.: 1-888-881-3302
TTY Users (U.S. Only):
1-888-889-2438
Canada: 1-800-268-6800
New GMC owners are automatically
enrolled in the Roadside Assistance
Program.
See Roadside Assistance Program
0 365.
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