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, 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
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.
5-66
L
Labelling, Tire Sidewall....................................5-52
Lamps
Exterior Lighting Battery Saver......................3-19
Fog ...........................................................3-18
Reading.....................................................3-20
LATCH System
Child Restraints...........................................1-40
Securing a Child Restraint Designed for the
LATCH System........................................1-42
Level Control..................................................4-51
Liftgate..........................................................2-12
Light
Airbag Readiness........................................3-37
Anti-Lock Brake System Warning...................3-39
Brake System Warning.................................3-38
Charging System.........................................3-38
Cruise Control.............................................3-46
Engine Coolant Temperature Warning.............3-40
Fog Lamp..................................................3-46
Highbeam On.............................................3-47
Lights On Reminder.....................................3-46
Malfunction Indicator....................................3-42
Oil Pressure...............................................3-45Light (cont.)
Safety Belt Reminder...................................3-36
Security.....................................................3-46
Sport Mode................................................3-45
TCS Warning Light......................................3-40
Tire Pressure..............................................3-41
Traction Control System (TCS) Warning..........3-40
Lighting
Entry.........................................................3-19
Parade Dimming..........................................3-20
Limited-Slip Rear Axle.....................................4-10
Loading Your Vehicle.......................................4-45
Lockout Protection..........................................2-11
Locks
Central Door Unlocking System....................... 2-9
Delayed Locking........................................... 2-9
Door........................................................... 2-8
Lockout Protection.......................................2-11
Power Door.................................................. 2-9
Programmable Automatic Door Locks.............2-10
Rear Door Security Locks.............................2-10
Loss of Control...............................................4-16
Luggage Carrier..............................................2-48
Lumbar
Power Controls............................................. 1-3
7
Towing
Recreational Vehicle.....................................4-50
Towing a Trailer..........................................4-52
Your Vehicle...............................................4-50
Traction
Control System (TCS).................................... 4-9
Control System Warning Light.......................3-40
Limited-Slip Rear Axle..................................4-10
Magnetic Ride Control..................................4-10
StabiliTrak
®System.....................................4-11
Transmission
Fluid, Automatic...........................................5-22
Transmission Operation, Automatic....................2-25
Trip Odometers..............................................3-35
Turn and Lane-Change Signals.......................... 3-8
Turn Signal/Multifunction Lever........................... 3-7
U
Ultrasonic Rear Parking Assist (URPA)...............3-20
Understanding Radio Reception.......................3-113
Uniform Tire Quality Grading............................5-66
V
Vehicle
Control........................................................ 4-6
Damage Warnings........................................... iv
Loading......................................................4-45
Symbols......................................................... iv
Vehicle Data Collection and Event Data
Recorders..................................................7-10
Vehicle Identi cation
Number (VIN).............................................5-93
Service Parts Identi cation Label...................5-93
Vehicle Personalization
DIC ...........................................................3-66
Memory Seat and Mirrors.............................2-53
Ventilation Adjustment......................................3-30
Visors...........................................................2-16
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