Page 265 of 348

If you must replace your vehicle’s tires with those that
do not have a TPC Spec number, make sure they
are the same size, load range, speed rating, and
construction type (radial and bias-belted tires) as
your vehicle’s original tires.
Vehicles that have a tire pressure monitoring system
could give an inaccurate low-pressure warning if
non-TPC Spec rated tires are installed on your vehicle.
Non-TPC Spec rated tires may give a low-pressure
warning that is higher or lower than the proper warning
level you would get with TPC Spec rated tires.
SeeTire Pressure Monitor System on page 5-59.
Your vehicle’s original equipment tires are listed on
the Tire and Loading Information label. SeeLoading
Your Vehicle on page 4-24, for more information about
the Tire and Loading Information label and its location
on your vehicle.Different Size Tires and Wheels
If you add wheels or tires that are a different size than
your original equipment wheels and tires, this may
affect the way your vehicle performs, including its
braking, ride and handling characteristics, stability,
and resistance to rollover. Additionally, if your vehicle
has electronic systems such as, anti-lock brakes,
traction control, and electronic stability control, the
performance of these systems can be affected.
{CAUTION:
If you add different sized wheels, your
vehicle may not provide an acceptable
level of performance and safety if tires not
recommended for those wheels are selected.
You may increase the chance that you will crash
and suffer serious injury. Only use GM speci c
wheel and tire systems developed for your
vehicle, and have them properly installed by
a GM certi ed technician.
SeeBuying New Tires on page 5-68andAccessories
and Modifications on page 5-3for additional information.
5-69
Page 266 of 348

Uniform Tire Quality Grading
Quality grades can be found where applicable
on the tire sidewall between tread shoulder
and maximum section width. For example:
Treadwear 200 Traction AA Temperature A
The following information relates to the system
developed by the United States National Highway
Traffic Safety Administration (NHTSA), which
grades tires by treadwear, traction, and
temperature performance. This applies only to
vehicles sold in the United States. The grades are
molded on the sidewalls of most passenger car
tires. The Uniform Tire Quality Grading (UTQG)
system does not apply to deep tread, winter-type
snow tires, space-saver, or temporary use
spare tires, tires with nominal rim diameters
of 10 to 12 inches (25 to 30 cm), or to some
limited-production tires.
While the tires available on General Motors
passenger cars and light trucks may vary with
respect to these grades, they must also conform
to federal safety requirements and additional
General Motors Tire Performance Criteria (TPC)
standards.
Treadwear
The treadwear grade is a comparative rating based
on the wear rate of the tire when tested under
controlled conditions on a speci ed government
test course. For example, a tire graded 150 would
wear one and a half (1.5) times as well on the
government course as a tire graded 100. The
relative performance of tires depends upon the
actual conditions of their use, however, and may
depart signi cantly from the norm due to variations
in driving habits, service practices, and differences
in road characteristics and climate.
Traction – AA, A, B, C
The traction grades, from highest to lowest, are AA,
A, B, and C. Those grades represent the tire’s
ability to stop on wet pavement as measured under
controlled conditions on speci ed government test
surfaces of asphalt and concrete. A tire marked C
may have poor traction performance.
Warning
:The traction grade assigned to
this tire is based on straight-ahead braking
traction tests, and does not include
acceleration, cornering, hydroplaning,
or peak traction characteristics.
5-70
Page 270 of 348

Used Replacement Wheels
{CAUTION:
Putting a used wheel on your vehicle is
dangerous. You cannot know how it has been
used or how far it has been driven. It could fail
suddenly and cause a crash. If you have to
replace a wheel, use a new GM original
equipment wheel.
Tire Chains
{CAUTION:
Do not use tire chains. There is not enough
clearance. Tire chains used on a vehicle without
the proper amount of clearance can cause
damage to the brakes, suspension, or other
vehicle parts. The area damaged by the tire
chains could cause you to lose control of your
vehicle and you or others may be injured in a
crash. Use another type of traction device only
if its manufacturer recommends it for use on
your vehicle and tire size combination and
road conditions. Follow that manufacturer’s
instructions. To help avoid damage to your
vehicle, drive slowly, re-adjust or remove the
device if it is contacting your vehicle, and do
not spin your wheels. If you do nd traction
devices that will t, install them on the
rear tires.
5-74
Page 347 of 348

T
Tachometer....................................................3-22
Taillamps
Turn Signal, and Stoplamps..........................5-48
Theft-Deterrent, Radio.....................................3-68
Theft-Deterrent Systems...................................2-13
Content Theft-Deterrent................................2-13
PASS-Key
®III+...........................................2-15
PASS-Key®III+ Operation.............................2-15
Tilt Wheel........................................................ 3-6
Time, Setting..................................................3-50
Tire
Pressure Light.............................................3-31
Tires.............................................................5-51
Aluminum or Chrome-Plated Wheels,
Cleaning.................................................5-91
Buying New Tires........................................5-68
Chains.......................................................5-74
Cleaning....................................................5-91
Different Size..............................................5-69
If a Tire Goes Flat.......................................5-75
In ation - Tire Pressure................................5-58
Inspection and Rotation................................5-65
Pressure Monitor Operation...........................5-61
Pressure Monitor System..............................5-59
Tire Sealant and Compressor Kit...................5-76
Tire Sidewall Labeling..................................5-53
Tire Terminology and De nitions....................5-55Tires (cont.)
Uniform Tire Quality Grading.........................5-70
Wheel Alignment and Tire Balance.................5-71
Wheel Replacement.....................................5-72
When It Is Time for New Tires......................5-67
Winter Tires................................................5-52
Towing
Recreational Vehicle.....................................4-29
Towing a Trailer..........................................4-29
Your Vehicle...............................................4-29
Traction
Control System (TCS).................................... 4-6
Limited-Slip Rear Axle.................................... 4-9
Traction Control System...................................3-29
Transmission
Fluid, Automatic...........................................5-23
Fluid, Manual..............................................5-23
Transmission Operation, Automatic....................2-22
Transmission Operation, Manual........................
2-24
Trunk.............................................................. 2-9
Trunk Ajar Light..............................................3-36
Turn and Lane-Change Signals.......................... 3-8
Turn Signal/Multifunction Lever........................... 3-7
U
Uniform Tire Quality Grading............................5-70
Using this Manual............................................... iii
11