Page 217 of 372

Object Detection
Systems
Ultrasonic Parking Assist
For vehicles with the Ultrasonic
Rear Parking Assist (URPA)
system, it assists the driver with
parking and avoiding objects while
in R (Reverse). URPA operates at
speeds less than 8 km/h (5 mph),
and the sensors on the rear bumper
detect objects up to 2.4m (8 feet)
behind the vehicle, and at least
20 cm (8 inches) off the ground.
{WARNING
The Ultrasonic Rear Parking
Assist (URPA) system does not
replace driver vision. It cannot
detect:
•objects that are below the
bumper, underneath the
vehicle, or if they are too
close or far from the vehicle
•children, pedestrians,
bicyclists, or pets.
If you do not use proper care
before and while backing; vehicle
damage, injury, or death could
occur. Even with URPA, always
check behind the vehicle before
backing up. While backing, be
sure to look for objects and check
the vehicle’s mirrors.The display is located in the center
of the rear seat back filler panel
trim and uses three color-coded
lights to provide distance and
system information.
Driving and Operating 8-41
Page 218 of 372

How the System Works
URPA comes on automatically
and the display briefly illuminates
to indicate the system is working
when the shift lever is moved into
R (Reverse).
If the vehicle is traveling faster
then 8 km/h (5 mph) in reverse,
the red light on the rear display
flashes.
Objects must be at least 20 cm
(8 inches) off the ground and below
trunk level, and within 2.4m (8 feet)
from the rear bumper to be detected.
The distance may be less during
warmer or humid weather.
A single beep sounds the first time
an object is detected between 1.0 m
(40 inches) and 2.4m (8 feet) away.
Beeping occurs continuously when
the vehicle is 0.6 m (23 inches) or
closer to an object.The following describes how the URPA display lights appear as the vehicle
gets closer to a detected object:
Description
MetricEnglish
amber light 2.4 m8 ft
amber/amber lights 1.0 m40 in
amber/amber/red lights
and continuous beeping for five seconds 0.6 m
23 in
amber/amber/red lights flashing and continuous beeping for five seconds 0.3 m
1 ft
PARK ASSIST OFF displays
on the Driver Information Center (DIC)
to indicate that URPA is off.
The message disappears after
a short period of time. See
Object Detection System
Messages on page 4-34 for other
URPA messages.
8-42 Driving and Operating
Page 219 of 372

When the System Does Not
Seem to Work Properly
If the URPA system does not
activate due to a temporary
condition, the message PARK
ASSIST OFF displays on the DIC
and a red light comes on the rear
URPA display when the shift lever is
moved into R (Reverse). This can
occur under the following conditions:
•The ultrasonic sensors are not
clean. Keep the vehicle’s rear
bumper free of mud, dirt, snow,
ice and slush. For cleaning
instructions, seeExterior Care
on page 9-88.
•A trailer was attached to the
vehicle, or an object was hanging
out of the trunk during the last
drive cycle, making the red light
come on in the rear display.
Once the attached object is
removed, URPA will return
to normal operation.
•A tow bar is attached to the
vehicle.
•The vehicle’s bumper is
damaged. Take the vehicle to
your dealer/retailer to repair the
system.
•Other conditions may affect
system performance, such as
vibrations from a jackhammer or
the compression of air brakes on
a very large truck that is near the
vehicle.
If the system is still disabled, after
driving forward at least 25 km/h
(15 mph), take the vehicle to your
dealer/retailer.
Fuel
Use of the recommended fuel
is an important part of the proper
maintenance of this vehicle. To help
keep the engine clean and maintain
optimum vehicle performance, we
recommend the use of gasoline
advertised as TOP TIER Detergent
Gasoline.
Look for the TOP TIER label on the
fuel pump to ensure gasoline meets
enhanced detergency standards
developed by auto companies. A list
of marketers providing TOP TIER
Detergent Gasoline can be found
at www.toptiergas.com.
Driving and Operating 8-43
Page 220 of 372

The 8th digit of the Vehicle
Identification Number (VIN) shows
the code letter or number that
identifies the vehicle’s engine.
The VIN is at the top left of the
instrument panel. SeeVehicle
Identi cation Number (VIN) on
page 11-1.
Recommended Fuel
If the vehicle has the 3.6L V6 engine
(VIN Code V), use regular unleaded
gasoline with a posted octane rating
of 87 or higher. If the octane rating is
less than 87, you might notice an
audible knocking noise when you
drive, commonly referred to as spark
knock. If this occurs, use a gasoline
rated at 87 octane or higher as soon
as possible. If you are using gasoline
rated at 87 octane or higher and you
hear heavy knocking, the engine
needs service.
If the vehicle has the 6.2L V8 engine
(VIN Code W) or the 6.2L V8 engine
(VIN Code J), use premium unleaded
gasoline with a posted octane
rating of 91 or higher. For best
performance, use premium unleaded
gasoline with a posted octane
rating of 93. You can also use
regular unleaded gasoline rated at
87 octane or higher, but the vehicle’s
acceleration could be slightly
reduced, and you might notice aslight audible knocking noise,
commonly referred to as a spark
knock. If the octane is less than 87,
you might notice a heavy knocking
noise when you drive. If this occurs,
use a gasoline rated at 87 octane
or higher as soon as possible.
Otherwise, you could damage the
engine. If you are using gasoline
rated at 87 octane or higher and you
hear heavy knocking, the engine
needs service.
Gasoline Speci cations
At a minimum, gasoline
should meet ASTM specification
D 4814 in the United States or
CAN/CGSB-3.5 or 3.511 in Canada.
Some gasolines contain an
octane-enhancing additive called
methylcyclopentadienyl manganese
tricarbonyl (MMT). We recommend
against the use of gasolines
containing MMT. SeeFuel
Additives on page 8-45for
additional information.
8-44 Driving and Operating
Page 221 of 372

California Fuel
Requirements
If the vehicle is certified to meet
California Emissions Standards, it is
designed to operate on fuels that
meet California specifications.
See the underhood emission control
label. If this fuel is not available in
states adopting California emissions
standards, the vehicle will operate
satisfactorily on fuels meeting federal
specifications, but emission control
system performance might be
affected. The malfunction indicator
lamp could turn on and the vehicle
might fail a smog-check test.
SeeMalfunction Indicator Lamp
on page 4-19. If this occurs, return
to your authorized dealer/retailer for
diagnosis. If it is determined that the
condition is caused by the type of
fuel used, repairs might not be
covered by the vehicle warranty.
Fuels in Foreign
Countries
If you plan on driving in another
country outside the United States
or Canada, the proper fuel might
be hard to find. Never use leaded
gasoline or any other fuel not
recommended in the previous text
on fuel. Costly repairs caused by
use of improper fuel would not be
covered by the vehicle warranty.
To check the fuel availability, ask
an auto club, or contact a major oil
company that does business in the
country where you will be driving.
Fuel Additives
To provide cleaner air, all gasolines
in the United States are now required
to contain additives that help prevent
engine and fuel system deposits
from forming, allowing the emission
control system to work properly.
In most cases, you should not have
to add anything to the fuel. However,
some gasolines contain only theminimum amount of additive
required to meet U.S. Environmental
Protection Agency regulations.
To help keep fuel injectors and
intake valves clean, or if the vehicle
experiences problems due to dirty
injectors or valves, look for gasoline
that is advertised as TOP TIER
Detergent Gasoline. Look for the
TOP TIER label on the fuel pump to
ensure gasoline meets enhanced
detergency standards developed
by the auto companies. A list of
marketers providing TOP TIER
Detergent Gasoline can be found
at www.toptiergas.com.
For customers who do not use
TOP TIER Detergent Gasoline
regularly, one bottle of GM Fuel
System Treatment PLUS, added
to the fuel tank at every engine oil
change, can help clean deposits
from fuel injectors and intake valves.
GM Fuel System Treatment PLUS
is the only gasoline additive
recommended by General Motors.
It is available at your dealer/retailer.
Driving and Operating 8-45
Page 222 of 372

Gasolines containing oxygenates,
such as ethers and ethanol, and
reformulated gasolines might
be available in your area. We
recommend that you use these
gasolines, if they comply with the
specifications described earlier.
However, E85 (85% ethanol) and
other fuels containing more than
10% ethanol must not be used in
vehicles that were not designed for
those fuels.
Notice:This vehicle was not
designed for fuel that contains
methanol. Do not use fuel
containing methanol. It can
corrode metal parts in the fuel
system and also damage plastic
and rubber parts. That damage
would not be covered under
the vehicle warranty.Some gasolines that
are not reformulated for low
emissions can contain an
octane-enhancing additive called
methylcyclopentadienyl manganese
tricarbonyl (MMT); ask the attendant
where you buy gasoline whether the
fuel contains MMT. We recommend
against the use of such gasolines.
Fuels containing MMT can reduce
the life of spark plugs and the
performance of the emission
control system could be affected.
The malfunction indicator lamp might
turn on. If this occurs, return to your
dealer/retailer for service.Filling the Tank
{WARNING
Fuel vapor burns violently and a
fuel fire can cause bad injuries.
To help avoid injuries to you and
others, read and follow all the
instructions on the fuel pump
island. Turn off the engine when
refueling. Do not smoke near fuel
or when refueling the vehicle.
Do not use cellular phones. Keep
sparks, flames, and smoking
materials away from fuel. Do not
leave the fuel pump unattended
when refueling the vehicle. This is
against the law in some places.
Do not re-enter the vehicle while
pumping fuel. Keep children away
from the fuel pump; never let
children pump fuel.
8-46 Driving and Operating
Page 223 of 372

The fuel cap is located behind a
hinged fuel door on the passenger
side of the vehicle.
To open the fuel door, push the
rearward center edge in and release
and it will open.
When reinstalling the cap, turn it
clockwise until it clicks, otherwise
the Malfunction Indicator Lamp may
turn on. SeeMalfunction Indicator
Lamp on page 4-19.
{WARNING
Fuel can spray out on you if
you open the fuel cap too quickly.
If you spill fuel and then something
ignites it, you could be badly
burned. This spray can happen if
the tank is nearly full, and is more
likely in hot weather. Open the fuel
cap slowly and wait for any hiss
noise to stop. Then unscrew the
cap all the way.
Be careful not to spill fuel. Do not
top off or overfill the tank and wait a
few seconds after you have finished
pumping before removing the nozzle.
Clean fuel from painted surfaces as
soon as possible. SeeExterior Care
on page 9-88.
When replacing the fuel cap,
turn it clockwise until it clicks.
Make sure the cap is fully installed.
The diagnostic system can
determine if the fuel cap has been
left off or improperly installed.This would allow fuel to
evaporate into the atmosphere.
SeeMalfunction Indicator Lamp
on page 4-19.
{WARNING
If a fire starts while you are
refueling, do not remove the
nozzle. Shut off the flow of fuel
by shutting off the pump or by
notifying the station attendant.
Leave the area immediately.
Notice:If a new fuel cap is
needed, be sure to get the right
type of cap from your dealer/
retailer. The wrong type fuel cap
might not t properly, might cause
the malfunction indicator lamp to
light, and could damage the fuel
tank and emissions system.
SeeMalfunction Indicator Lamp
on page 4-19.
Driving and Operating 8-47
Page 224 of 372

Filling a Portable Fuel
Container
{WARNING
Never fill a portable fuel container
while it is in the vehicle. Static
electricity discharge from the
container can ignite the fuel vapor.
You can be badly burned and the
vehicle damaged if this occurs.
To help avoid injury to you and
others:
•Dispense fuel only into
approved containers.
•Do not fill a container while
it is inside a vehicle, in a
vehicle’s trunk, pickup bed,
or on any surface other than
the ground.
(Continued)
WARNING (Continued)
•Bring the fill nozzle in contact
with the inside of the fill
opening before operating the
nozzle. Contact should be
maintained until the filling is
complete.
•Do not smoke while
pumping fuel.
•Do not use a cellular phone
while pumping fuel.
Towing
General Towing
Information
Only use towing equipment that
has been designed for the vehicle.
Contact your dealer/retailer or towing
retailer for assistance with preparing
the vehicle for towing a trailer.
See the following trailer towing
information in this section:
•For information on driving while
towing a trailer, see Driving
Characteristics and Towing Tips.
•For maximum vehicle and trailer
weights, see Trailer Towing.
•For information on equipment
to tow a trailer, see Towing
Equipment.
For information on towing a disabled
vehicle, seeTowing the Vehicle
on page 9-87. For information on
towing the vehicle behind another
vehicle — such as a motorhome,
seeRecreational Vehicle Towing
on page 9-87.
8-48 Driving and Operating