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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.
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Page 303 of 384

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.
If a Tire Goes Flat
Your vehicle has a tire in ator kit. There is no
spare tire, no tire changing equipment, and
no place to store a tire.
It is unusual for a tire to blow out while you are
driving, especially if you maintain your tires
properly. SeeTires on page 284. If air goes out
of a tire, it is much more likely to leak out slowly.
But, if you should ever have a blow out, here are
a few tips about what to expect and what to do:
If a front tire fails, the at tire will create a drag
that pulls the vehicle toward that side. Take
your foot off the accelerator pedal and grip the
steering wheel rmly. Steer to maintain lane
position, and then gently brake to a stop well out
of the traffic lane.
A rear blow out, particularly on a curve, acts much
like a skid and may require the same correction
you would use in a skid. In any rear blow out,
remove your foot from the accelerator pedal.
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Page 378 of 384

Light (cont.)
Highbeam On.......................................... 142
Low Fuel Warning.................................... 143
Malfunction Indicator................................ 138
Oil Pressure............................................. 141
Passenger Airbag Status Indicator............ 131
Passenger Safety Belt Reminder.............. 130
Safety Belt Reminder............................... 129
Security................................................... 142
Traction Control System........................... 136
Trunk Ajar................................................ 142
Lighting
Entry/Exit................................................. 120
Limited-Slip Rear Axle................................. 200
Loading Your Vehicle................................... 225
Locks
Automatic Door Lock................................. 68
Automatic Door Unlock.............................. 68
Delayed Locking........................................ 67
Manual Door.............................................. 66
Power Door............................................... 67
Loss of Control........................................... 208
Low Fuel Warning Light............................... 143M
Maintenance Schedule
Additional Required Services.................... 338
At Each Fuel Fill...................................... 341
At Least Once a Month............................ 341
At Least Once a Year.............................. 342
Introduction.............................................. 334
Maintenance Footnotes............................ 339
Maintenance Record................................ 349
Maintenance Requirements...................... 334
Normal Maintenance Replacement Parts.... 347
Owner Checks and Services.................... 340
Recommended Fluids and Lubricants....... 345
Scheduled Maintenance........................... 336
Using....................................................... 334
Your Vehicle and the Environment............ 334
Malfunction Indicator Light........................... 138
Manual Seats.................................................. 8
Manual Transmission
Fluid........................................................ 254
Operation................................................... 85
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Traction
Control System (TCS).............................. 199
Limited-Slip Rear Axle.............................. 200
Traction Control System Warning Light........ 136
Transmission
Fluid, Automatic....................................... 254
Fluid, Manual........................................... 254
Transmission Operation, Automatic................ 82
Transmission Operation, Manual.................... 85
Trunk............................................................ 68
Trunk Ajar Light........................................... 142
Turn and Lane-Change Signals................... 112
Turn Signal/Multifunction Lever.................... 111
U
Understanding Radio Reception................... 189
Uniform Tire Quality Grading....................... 299
V
Vehicle
Control..................................................... 196
Damage Warnings....................................... 5
Loading.................................................... 225Vehicle (cont.)
Parking Your.............................................. 89
Symbols...................................................... 5
Vehicle Data Collection and Event Data
Recorders................................................ 363
Vehicle Identi cation
Number (VIN).......................................... 324
Service Parts Identi cation Label.............. 324
Vehicle Personalization
DIC .......................................................... 152
Ventilation Adjustment.................................. 126
Visors........................................................... 72
W
Warning Lights, Gages and Indicators......... 127
Warnings
DIC Warnings and Messages................... 147
Hazard Warning Flashers......................... 110
Other Warning Devices............................ 110
Safety and Symbols..................................... 4
Vehicle Damage.......................................... 5
Wheels
Alignment and Tire Balance..................... 300
Different Size........................................... 298
Replacement............................................ 300
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