120310002A

File in Section:
Service Bulletin
03 - Suspension
Bulletin No.:
12-03-10-002A
Date:
February, 2014
INFORMATION
Subject:
Proper Wheel Installation and Wheel Torque Techniques
Models:
2006-2015 GM Passenger Cars and Light Duty Trucks
This bulletin has been revised to add the 2014-2015 model years. Please discard Corporate
Bulletin Number 12-03-10-002.
Some customer may report vibration in the steering
wheel or the seat centered at a frequency of 10-14 Hz,
between 93-115 km/h (58-72 mph). First order tire/
wheel vibration may be misdiagnosed as tire/wheel
assembly imbalance or excessive tire Radial Force
Variation.
Inappropriate wheel torque methods may cause the
wheel and tire assembly to be offset when mounting.
This offset causes the mass of the tire and wheel to
"orbit" the axis of the hub and creates vibration similar
to a tire with high RFV or a tire with an imbalance.
Notice: Improper torque may cause distortion of the
brake rotor, and may result in variance in wheel
mounting that can cause smooth road shake vibration.
Proper Wheel Installation Information
Remove the tire and wheel assemblies from the
vehicle. Index them at least two stud positions from the
previous position and re-install them. Tighten using an
appropriate torque pattern technique in the three steps
below. Do not use torque sticks or an impact driver to
tighten wheel lug nuts.
Important: Do not use torque sticks or an impact
driver to tighten wheel lug nuts.
1. With the wheel off of the ground, install all lug nuts
hand tight using only a socket.
2. Snug all lug nuts using a star or "criss-cross"
pattern using a hand wrench. Refer to the
appropriate illustration for the number of lugs on
the wheel being installed.
Copyright 2014 General Motors LLC. All Rights Reserved.
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February, 2014
Bulletin No.: 12-03-10-002A
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3. Lower the vehicle until there is just enough contact
to provide resistance to complete torquing to
specification with a torque wrench.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
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