March 2012
Volume 14, No. 3
All-New 2013
As the first Chevrolet to feature e
­ Assist
electric technology, the all-new 2013
­Malibu Eco delivers outstanding fuel
­efficiency without compromising ride,
­performance or comfort.
Combined with a 2.4L Ecotec 4-cylinder
engine, the eAssist system (RPO HP6)
uses a lithium-ion high voltage battery,
electric induction motor-generator and
regenerative braking to provide added
Malibu Eco
v­ ehicle performance when needed while
also enhancing fuel economy.
To be introduced later in the model year in
other Malibu models will be an all-new 2.5L
4-cylinder engine.
All Malibu models are based on GM’s
Global Architecture (Global A), which requires use of the Global Diagnostic System
2 (GDS 2) and the Multiple Diagnostic
Interface (MDI) tool.
eAssist Powertrain
Malibu Eco’s eAssist system is mated to
an Ecotec 2.4L direct-injection four-cylinder engine (RPO LUK) and Hydra-Matic
6T40 six-speed automatic transmission
(RPO MHH). The lightweight aluminum engine is rated at 182 horsepower and
170 lb.-ft. of torque.
continued on page 2
New GDS 2 Graphing
Compares Multiple Parameters
The graphing capabilities of the Global
­Diagnostic System 2 (GDS 2) were
recently updated. The new software
package makes it easier to manipulate
and view data, and is available for both
live data and stored data.
One of the enhancements included
in this update is the ability to overlay
graphs in order to compare multiple
­parameters. A new line format provides easy-to-read values. Plus, it allows data
to be sorted by parameter, ECU or the units.
The overlay feature can be used by simply selecting specific data parameters
in the Diagnostic Data Display tab and then clicking the Lock icon. Once the
continued on page 2
All-New 2013 Malibu Eco . . . . . . . . . . . . . . . . . . . . 1
New GDS 2 Graphing Compares
Multiple Parameters . . . . . . . . . . . . . . . . . . . . . . . . 1
Service Bolts for Camber Adjustment. . . . . . . . . . . 3
Inside Rearview Mirror Adjustment Points . . . . . . . 3
Upgraded Special Tool Organization
Website Features Tool Instructions and Images. . . 4
Trunk Lid Not Opening Completely. . . . . . . . . . . . . 4
Steering Gear Replacement Guidelines. . . . . . . . . . 5
Double-Check Wheel Alignment Specifications . . . 5
Blank Back-Up Camera Display . . . . . . . . . . . . . . . 6
Trailer Brake Switch and Fretting Corrosion. . . . . . 6
Intermittent Low Fuel Light. . . . . . . . . . . . . . . . . . . 7
No Radio Reception, OnStar Fades while Driving. . 7
Transmission Control Module Connector Terminals.7
Car Issues – Fix It Right the First Time. . . . . . . . . . 8
Truck Issues – Fix It Right the First Time. . . . . . . . . 9
Service Know-How . . . . . . . . . . . . . . . . . . . . . . . . . 9
Customer Care and Aftersales
All-New 2013 Malibu Eco – continued from page 1
The eAssist system uses power stored in
the air-cooled 115V lithium-ion battery to
provide needed electrical boost in various
driving scenarios. Fuel economy also is
increased through:
• Automatic engine start-stop functionality
that uses electricity instead of gasoline
when stopped
• Aggressive fuel cut-off during deceleration
down to zero mph for added fuel savings
• Regenerative braking, which provides
up to 15 kW of electricity to charge the
lithium-ion battery
• A standard active shutter system located
in the lower grille that automatically closes
airflow through the lower intake opening
when it’s least needed. The shutter is
open or closed based on engine coolant
temperature and speed
• Four underbody panels that cover approximately 50 percent of the lower portion
of the vehicle, providing a cleaner airflow
path beneath the vehicle
The 65 pound (29 kg) lithium-ion battery
power pack is located in a compartment
between the rear seat and trunk. An electric fan cools the power pack, drawing air
from a vent located in the package tray,
behind the rear seat.
The induction motor-generator bolsters
the engine with approximately 11 kW
(15 horsepower) of electric power assist
during heavy acceleration and 15 kW of
regenerative braking power.
For more information about the operation
of the eAssist system, refer to the July
2011 edition of TechLink.
Several eAssist parts are currently on
restriction through the GM Technical
­Assistance Center. Refer to #PIP4920D
for more information.
The Malibu Eco’s aerodynamically
­optimized exterior was designed to
stand out with an aggressive, substantial
­appearance. It has
a 4.5-inch (114 mm)
shorter wheelbase
and the 62-inch (1,574
mm) front and rear
tracks are more than
two inches (51 mm)
wider than the model
it replaces.
A. Electric motor-generator
B. 2.4L Ecotec 4-cylinder engine
C. 115V lithium-ion high voltage battery
­ arameters are locked in, they can
be displayed as a line graph as well
as individual parameters. To view the
graphs of individual parameters, click
the Graphical Data Display tab. The
parameters can be manipulated several
ways, including moving the timeline,
zooming in and out, and moving the
graph data.
In addition, the tool bar functions on
the side of the screen can be used to
change the settings of the graph. Data
Chassis control technologies include fourchannel anti-lock brakes, full-function traction control, four-corner electronic stability
control (StabiliTrak), electronic brake
force distribution, brake assist, corner
brake control, panic brake assist and drag
torque control.
Additional safety features include eight
standard air bags — including knee air
bags and full-length side curtain air bags
— and available rear thorax/pelvis air
Customer Convenience
Ride and Handling
The suspension includes a MacPherson
strut front and a multilink rear setup with
aluminum components
and a hollow stabilizer
bar to reduce unsprung weight.
discs and 11.5-inch (292 mm) solid rear
discs with ­aluminum rear calipers.
The braking system
has 11.7-inch (297
mm) ventilated front
continued from page 1
of the entire graph or just one parameter can be manipulated. Functions
include adding or removing data
­capture indicators, expanding or
­condensing the data points, and adding
or removing graph gridlines.
To view a demonstration of the new
graphing capabilities of GDS 2, check
out the February Emerging Issues
seminar (10210.03D) on
Thanks to Matt Singer
The Malibu Eco color touch radio features
the available MyLink system.
The new optional MyLink system available on the Malibu Eco uses Bluetooth®
or USB to connect a smartphone or other
portable device, such as an iPod®, to the
7-inch LED high-resolution touch screen
display. System control is enabled via
voice activation control and streaming
­online services like Pandora® Internet
Radio and Stitcher SmartRadio® are
seamlessly integrated.
For more information about the MyLink
system, refer to the February 2012 edition
of TechLink.
In addition to entertainment information,
the touch screen also displays climate
control operation.
TIP: When the climate control system
is turned off, the SYNC (links all settings
to the driver’s setting) indicator on the
­passenger’s temperature control may
­remain illuminated.
Another available customer convenience
feature is the optional heated seats,
which can be linked with the remote start
feature. In temperatures lower than 45º
F (7º C), the heated seats automatically
activate during a remote start if enabled
through the Vehicle Settings menu.
continued on page 3
March 2012
All-New 2013
Malibu Eco –
Service Bolts for Camber
continued from page 2
When performing a wheel alignment on a 2012 Sonic, do not grind the front
strut bores for the bolts to allow adjustment of the front camber. There are
­service bolts available to allow the front camber to be adjusted, if needed.
TIP: The heated seats will turn off after a
remote start once the vehicle is started by the
driver using the key.
The Malibu Eco is fitted with a 5.4-mm acoustic-laminate windshield and 5-mm acousticlaminated front door glass, which reduce wind
noise by about three decibels when compared
to conventional tempered glass. Noise also is
reduced by 16 expanding-foam acoustic baffles
that are placed in cavities throughout the body
In order to adjust camber, replace the existing bolt, part number 11610469,
that has a 0.05 to 0.35 mm interference fit (no movement) with service bolt,
part number 11561297, that has a 2 mm clearance and service nut, part number 11516382, allowing movement of the strut to change the vehicle’s camber.
Thanks to these sound-reducing and soundabsorbing components as well as the aero-optimized exterior, the Malibu Eco is the quietest
Chevrolet in history.
On upcoming Malibu models without eAssist,
pushbutton engine start and passive entry will
be available. The Remote Keyless Entry transmitter must be in the vehicle to turn on the
When programming control modules, the
­ignition must be in the ignition On, engine Off
mode by pressing and holding the Start/Stop
button, without pressing the brake pedal, for
10 seconds. The green LED indicator on the
button will illuminate. This mode is different
from the Accessory mode, in which the Start/
Stop button is pressed without the brake pedal
To operate the passive entry system, the RKE
transmitter must be within approximately three
feet of the vehicle. Pressing the touchpad on
any door handle will unlock the door. Press it
again to unlock all doors (depending on Vehicle
Settings in the Configuration menu). Pressing
the touchpad on a front door handle will immediately lock the vehicle. The ignition must be off,
the RKE transmitter out of the vehicle, and all
doors closed.
Service Training
To view the training courses covering
many of the different Malibu systems, visit (or www.gmprocanada.
com in Canada).
There are several eAssist-related training
courses available, covering safety information,
diagnostics and service. Plus, to learn more
about the new entertainment system, check out
course Entertainment Systems 2, 19047.13W2,
which covers Bluetooth functions and features
(MyLink) as well as how to identify and diagnose connectivity concerns.
Thanks to Bob Wittman
Production camber bolt part number
11610469 with 0.05 to 0.35 mm
interference fit (no movement)
If unable to adjust the camber to specifications, inspect the vehicle closely and
replace any bent or damaged components.
Thanks to Ernest Haller
Inside Rearview Mirror
Adjustment Points
The inside rearview mirror of the 2013 Malibu features two adjustment points
— one at the mirror and one at the windshield. If the mirror is not adjusted
properly, the driver’s view through the mirror may be reduced by the headliner
or the auto-dimming feature of mirror may not darken automatically due to the
photo sensor being shaded by the headliner.
Check the positioning of the inside
rearview mirror
at both points of
­adjustment. If the
pivot at the windshield is up all the
way, when the mirror is adjusted for
viewing at the lower
pivot, the headliner
will be visible in the
mirror and will shade
the dimmer photo
sensor. Adjust the
pivot at the windAdjust the pivot at the windshield first (A), and then
shield downward
position the mirror (B)
first, and then position the mirror for
the desired viewing angle.
Thanks to Christopher Crumb
March 2012
Service camber bolt part number
11561297 with 2 mm
Upgraded Special Tool Organization Website
Features Tool Instructions and Images
Tutorial Video – An informative video that guides users through
the key functions of the website is available. It explains how each
screen of the website can be used to help organize the dealership’s special tool inventory.
The GM Special Tools Organization website managed by SPX
(Kent-Moore) is designed to help dealerships manage their
special tool inventory. Several updates have been implemented
recently to the website to increase the use and organization of
special tools.
Special Tool Information
The website also provides quick access to plenty of special tool
information. All monthly special tool shipment notices are posted
by year/month and a Special Tool list by franchise is updated
monthly. In addition, the website includes an electronic catalog of
all GM special service tools.
TIP: Never discard older special tools. GM and SPX continuously monitor the entire tool database to determine additional
­applications for current tools to avoid new tool releases.
The Tool Organization link is on the SPX home page
for GM Special Service Tools.
The website is accessed via the GM Special Service Tools Website link provided in GlobalConnect Service Workbench. On the
SPX home page for GM Special Service Tools, look for the GM
Tool Organization link on the left side of the page.
Tool Images and Videos
For 2012, new enhancements to the website include new images
and training videos on many special tools as well as updated tool
organization and inventory information.
Tool Use Images – Over 150 new images are available on the
website to help identify the special tools. In addition, by clicking
“Search Videos” and selecting a special tool number, a variety of
tool instruction training videos can be viewed.
The tool browser allows users to search for tool information.
Sales History Upload – To save time assigning existing tools
in the dealership, the current GM Special Tool sales history has
been uploaded to an account for every dealership. For dealerships
not currently using the website, contact SPX for the necessary
login information to obtain your uploaded tool history. Using the
Tool Location feature, tool storage locations can be assigned for
the dealership’s tool inventory to make it easier to find and use
the special tools needed for proper repairs.
To visit the Special Tool Organization website login page,
click here.
To obtain a user name and password, contact SPX at
1-800-GM TOOLS or [email protected]
Thanks to Russ Dobson
Trunk Lid Not Opening Completely
On some 2013 Chevrolet Malibu Eco models, the trunk lid may not rise by itself to the
full upright position when released. This may be caused by the trunk lift springs being in
the wrong position.
Loosen the trunk trim to gain access to the lift springs. Check the position of each
spring. Both lift springs should be in the rear-most position in order for the trunk lid to
open completely when released.
Thanks to Christopher Crumb
Check that the lift springs are in
the rear-most position.
March 2012
Steering Gear Replacement Guidelines
When diagnosing a steering condition on 2007-2010 Outlook, 2007-2012 Enclave
and Acadia, and 2008-2012 Traverse models, there are several bulletins that should
be reviewed before replacing the steering gear assembly. In many cases, a component
in the assembly may be available and it is not necessary to replace the entire gear
Here’s a summary of possible steering wheel conditions:
• A squeaking/rubbing noise that sounds like it is coming from the steering column or
intermediate shaft. Check for proper intermediate shaft grommet orientation. Refer to
Bulletin #09-02-34-001B. If this does not correct the noise, replace the pinion shaft
housing. Refer to #PI0029F.
• A knocking/clunking noise from the steering gear, front suspension or front frame area.
Check for loose steering gear bushings. Refer to Bulletin #10-02-32-001A.
• A knocking/clunking noise at the end of the steering travel. This is a hydraulic knock,
which is considered normal when present at the end of the steering travel. No repairs
should be attempted for this condition.
Noise may be caused by the
alignment of the grommet on the steering
column intermediate shaft.
Any of these conditions should not require a complete steering gear assembly replacement. Review these bulletins to ensure that a steering gear is not being replaced to correct any of these conditions. If a steering gear
replacement is necessary for any reason, it is recommended to convert the steering system to the use of DEXRON VI as outlined in
#PI0620 to prevent future repairs for a steering gear squeak noise.
Thanks to Gary McAdam
Double-Check Wheel Alignment Specifications
Before performing a steering wheel angle/front toe set or wheel
alignment check/adjustment, be sure to verify the wheel alignment specifications for the vehicle. A number of complications may
occur if the incorrect wheel alignment specifications are used.
For additional information about wheel alignment service, equipment, and warranty administration requirements, refer to Bulletin
Using the wrong wheel alignment specifications may be the
result of:
• The vast variation in specifications depending on the type of
­vehicle, model year, and the RPO content — tire, suspension, and
engine options being some of the most predominant
• The wheel alignment rack does not contain up-to-date specifications, which may cause some alignment measurements to show as
out of specification, when they are really within specification
• Entering the VIN only into the wheel alignment equipment, which
does not allow the determination of the pertinent option content on
the vehicle — tire and suspension RPOs, for instance
• The frequency in which the wheel alignment rack specifications are
being updated
• Not verifying the specifications indicated on the wheel alignment
rack with the appropriate Service Information (SI)
Submitted warranty claims show several examples where the
vehicle was within specification when it was placed on the wheel
alignment rack and it was adjusted out of specification because a
source of information other than SI was used to verify the vehicle
The only recommended source of current, accurate wheel alignment specifications (both targets and tolerances) is SI. It is also
critical to ensure that the specifications selected correspond to the
option content on the vehicle.
Not using the correct specifications as shown in SI at the time of
repair may result in the warranty claim being subject to review. A
copy of the current specifications in SI should be submitted with
the claim.
Thanks to Dave McGillis
March 2012
Blank Back-up Camera Display
On some 2012 Equinox and Terrain models equipped with a back-up camera (RPO
UVC), the camera display may be blank
or the image may be fuzzy. A “Check
Surrounding Area” message also may be
This condition is typically found during PDI
or early in the life of the vehicle. No DTCs
are set. The poor image quality or blank
display may be caused by one or more of
the power, ground or video signal circuits
shorted or open due to a poor connection.
connection or video wires shorted behind
the radio. Printing the wire schematic
related to the camera circuits and the
­connecter end views for connectors X212,
X900, and X904 may be helpful.
The X212 connecter is located on the
right-side kick panel just below the glove
box. It contains the three camera video
signal circuits 6974, 6972 and 6973.
X904 connector
In addition, inspect the UBEC fuse #54
for the Rear CAM 5A for an open circuit.
TIP: Do not replace the back-up camera
for this condition. The blank screen with
a “Check Surrounding Area” message
indicates the back-up camera voltage has
reached the radio and is missing the video
Specific connector issues with the back-up
camera may include terminals that are not
seated or are bent, poor camera pigtail
X900 connector
Check for any broken wiring and bent or
backed-out terminals.
X212 connector
If no connection conditions are found, inspect circuit 6972, video positive, and circuit 6973, video negative, from connector
X212 back to the radio for an unwanted
ground or open condition. Also inspect the
wire harness routing for chafing and that
shield circuit 6974 is grounded only at the
camera end, not at the radio. Poor image
quality is usually caused by an ungrounded
shield wire for the video circuits.
Disconnect and inspect X900 (behind
the liftgate upper trim panel) and X904
(behind the liftgate lower trim panel) for
bent or backed-out terminals. Verify resistance is 5 Ohms or less to ground and
that voltage is 12V with the ignition off.
Press the key fob Unlock button to turn on
the Reverse lamps (circuit 24 powers the
Reverse lamps and is only active when the
engine is running and the transmission is
in Reverse. Using the key fob to turn on
the back up lamps/approach lighting is
easier for testing purposes.)
If the connections test OK, disconnect
the camera pigtail connection to check for
bent, backed-out or loose terminals. With
X904 connected, verify power, ground and
Reverse input voltage at the connecterside of harness call out 16.
Thanks to Gordon Baillod
Trailer Brake Switch and Fretting Corrosion
Some 2008-2011 Avalanche, Silverado, Suburban, Tahoe, Sierra,
Yukon, Yukon XL, Yukon Denali, and Yukon Denali XL models
equipped with a Trailer Brake Controller (RPO JL1) may have
DTC B3894 Symptom 5A (Stop Lamp Switch Circuit Plausibility)
set and a Service Trailer Brake message displayed on the Driver
Information Center.
• Micro motion
On low current signal circuits, this condition may cause high resistance, resulting in intermittent connections.
The failure of many of the stop lamp switches that have been
­returned to the Warranty Parts Center for inspection and testing has not been confirmed. DTC B3894 may be setting due to a
­wiring/terminal fretting corrosion condition at the brake switch.
TIP: Fretting corrosion looks like little dark smudges on electrical terminals and appears where the actual electrical contact is
being made. In less severe cases it may be unable to be seen or
identified without the use of a magnifying glass.
Prior to replacing any switches, inspect the terminals at the brake
switch. The fretting corrosion condition is caused by a buildup of
non-conductive insulating oxidized debris occurring between the
two electrical contact surfaces of the connection or connector.
To combat fretting corrosion, use a clean, one-inch nylon bristle
brush to apply dielectric lubricant to both the brake switch-side
and the harness-side of the affected connector. Reconnect the
­affected connector and wipe away any excess lubricant.
Fretting corrosion may be caused by any of the following:
TIP: Do not apply an excessive amount of dielectric lubricant to
the connector or hydro lock may result when attempting to mate
the connector.
• A connector, component or wiring harness not properly secured
­resulting in movement
• Vibration
• Thermal cycling
Thanks to James Will
• Poor connection/terminal retention
March 2012
Intermittent Low Fuel Light
GM TechLink is published for all
GM retail technicians and service
consultants to provide timely
information to help increase know­
ledge about GM products and
improve the performance of the
service department.
Diana Sancya
GM Customer Care and Aftersales
/ [email protected]
Lisa G. Scott
GM Customer Care and Aftersales
/ [email protected]
Technical Editor:
Mark Spencer
/ [email protected]
The low fuel light on some 2004-2011
Aveo, 2005-2009 Wave (Canada only)
and 2009-2010 G3 models may appear to
operate intermittently. It may be difficult
to duplicate this condition, or to locate any
diagnostic and/or description and operation information for the low fuel light in the
Service Information.
The low fuel light is operated by a
­thermistor in the fuel pump module. The
fuel keeps the thermistor cool. When the
fuel level drops below approximately 1.7
gallons (6.4 L), the thermistor is no longer
­submerged in the fuel and the voltage from
circuit 172 begins to warm the thermistor, decreasing the resistance. After approximately six minutes, the low fuel light
If the vehicle is turned off for a period of
time and then restarted, the low fuel light
may not come back on for approximately
six minutes, depending on the thermistor
Based on operating conditions, the operation of the low fuel light may be normal. Do
not replace any parts prior to testing the
fuel level thermistor and circuits.
On the Aveo, Wave and G3, the fuel pump
can be accessed without removing the
fuel tank by removing the rear seat. Jump
circuit 172 to 850 at the fuel pump module
connector on the body side of the harness.
If the low fuel light illuminates, the circuits
and instrument panel cluster are OK. If
the light does not illuminate, test the
­instrument panel cluster and circuits 172
and 850.
The thermistor resistance specification is
750 to 1100 Ohms at 77° F. As the thermistor warms up, the resistance drops. If the
thermistor is within specification, verify the
vehicle’s fuel level is below the thermistor.
If it is not, follow the current version of
#PIC3209C to verify the fuel level resistances and circuits from the sender to the
Engine Control Module (ECM).
Thanks to Ernest Haller
Production Manager:
Marie Meredith
Desktop Publishing:
5by5 Design LLC
/ [email protected]
FAX number:
A 2012 Sonic with XM and the OnStar
­tri-band antenna may not have any radio
­reception (AM, FM or XM) and OnStar
­service may fade in and out while driving.
Write to:
PO Box 500
Troy, MI 48007-0500
GM TechLink on the Web:
GM GlobalConnect
General Motors service tips are intended
for use by professional ­technicians, not
a “do-it-yourselfer.” T­hey are written to
inform those ­technicians of conditions
that may occur on some vehicles, or to
provide­information 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
information applies to your vehicle or that
your vehicle will have that condition. See a
General Motors dealer servicing your brand
of General Motors vehicle for information
on whether your vehicle may benefit from
the information.
Inclusion in this publication is not
­necessarily an endorsement of the
individual or the company.
Copyright© 2012 General Motors
All rights reserved.
No Radio Reception,
OnStar Fades while Driving
Inspect the antenna coaxial connections at
the tri-band antenna for proper routing. The
coaxial connections may be swapped at the
body side of the harness at the antenna
Thanks to Ernest Haller
Transmission Control Module
Connector Terminals
The 2008-2012 CTS equipped with a 6-speed automatic transmission may exhibit an
­intermittent no crank/no start condition along with an intermittently illuminated Service
Engine Soon lamp. DTCs U0100, U0121 and/or a U0101 may be set with no communication with the Transmission Control Module (TCM), Electronic Brake Control Module
(EBCM), and/or Engine Control Module (ECM).
If this condition is present, check the round connector at the Transmission Control
­Module (Control Solenoid Valve Assembly) for any high-speed LAN wires that may be
pushed out of the back of the connector.
After locating the high-speed LAN wires, gently pull on the wires to make sure they are
seated correctly. The terminals may be pushed out of the connector body with damaged
lock tabs on the terminal. Replace any suspect terminals and re-test.
Thanks to Stephen Jacob
March 2012
Check for the correct coaxial connections,
as shown.
Car Issues – Fix It Right the First Time
Vehicle Line(s)/Condition
Do This
Don’t Do This
Sonic — Incorrect information on underhood fuse
block label
The underhood fuse block label
incorrectly indicates the usage for
the TCM fuse location F20 (10A) as
not used. The label was not updated
after a harness circuit change during
DO NOT remove the fuse
thinking it’s not being used
Cruze, Equinox, LaCrosse, Regal, SRX, Terrain, Volt
— Steering wheel adjustment (tilt/telescope) lever
sticks, binds
Install thrust washer under the
steering wheel adjustment (Tilt/
Telescope) lever nut
Replace Steering Column
CTS, CTS Coupe, CTS Sport Wagon — Differential
gear whine, hum/whirring noise or pinion gear whine
from rear axle
Replace the prop shaft
Install the snubber kit
CTS, SRX, STS — Vibration felt in shifter handle if
resting hand on shifter
Replace the transmission shift linkage
Replace the shifter handle or
other parts
LaCrosse, Malibu, Regal — MIL On, DTCs P1B37,
P1B38 and P1B39 set
Move the 2-way radio antenna to a
trunk mounted location
Replace any parts
Enclave, Escalade, Escalade ESV, Escalade EXT, CTS,
CTS-V, CTS Sports Wagon, SRX, Impala, Avalanche,
Silverado, Suburban, Tahoe, Malibu, Traverse,
Equinox, Acadia, Sierra, Yukon, Yukon XL, Yukon
Denali, Yukon Denali XL, Terrain, G6, Aura, Outlook
— Low beam headlamp bulb diagnosis/replacement
Inspect the connector
Replace the entire headlamp
Regal — Center console door will not open or stay
Tie off the wiring harness so it doesn’t
interfere with the operation of the
Replace the ashtray
Impala — Engine wiring harness rubbing on
transmission, various DTCs set including P0641 and/
or P06A3, MIL On
Inspect engine harness rub condition
on transmission
Replace parts
Regal — Touch screen functions inoperable or radio
cycles through screens without user input
Shim bezel
Replace radio or display
Impala — Service StabiliTrak displayed in DIC
Align bracket and relearn BPPS
Replace parts
LaCrosse, Malibu, Regal — Groan, squeak or rubbing
type noise when turning steering wheel
Inspect steering boot installation and
Remove the boot assembly
Astra, Aveo, Cruze, G3, Sonic — MIL On, DTC P0341
or P0366 set after camshaft sensor replacement
Check air gap between sensor and
reluctor ring
Replace the sensor if gap
too large
Cruze, Sonic — Poor engine performance and/or
DTCs set after partial engine replacement
Swap reluctor ring from old engine
Install engine without
swapping all parts from old
March 2012
Truck Issues – Fix It Right the First Time
Vehicle Line(s)/Condition
Equinox, Terrain — Engine no crank/no start due to
discharged battery/parasitic current draw
Install the latest version HVAC
control module software
Replace the BCM or HVAC
control module
Avalanche, Canyon, Colorado, Denali, Envoy,
Escalade, Escalade ESV, Escalade EXT, Express,
H2, H3, Savana, Sierra, Silverado, Suburban, Tahoe,
TrailBlazer, TrailBlazer EXT, Yukon, Yukon Denali,
Yukon XL, Yukon XL Denali — Diagnosis and Repair
- MIL illuminated, reduced engine power message
displayed, DTC P2135 set
Replace the Throttle Body
cover and download the Service
Replace the throttle body
Avalanche, Escalade, Escalade ESV, Escalade EXT,
Sierra, Silverado, Suburban, Tahoe, Yukon, Yukon
Denali, Yukon XL, Yukon XL Denali — Park Assist
blocked see Owner Manual displayed in DIC
Reprogram Object Alarm Module
with revised calibration
Replace the module or the rear
park assist sensors
Express, Savana, Sierra, Silverado — Exhaust leak
or vibration/rattle noise at approximately 900 rpm,
fuel smell, white smoke, oily substance on exhaust
Realign or replace Turbocharger
exhaust pipe
Release truck without verifying
a good fix with a service
Sierra, Silverado — Brake pulsation, brake drag or
vibration felt in steering wheel
Follow procedure to identify the
source of the brake drag
Do not mistake the condition for
wheel/tire vibration
Sierra, Silverado — Rear brake (parking brake) does
not release, excessive noise, brake drag, brake dust
Replace backing plate with revised
Replace park brake shoes and/
or hardware without replacing
backing plate
Acadia, Enclave, Outlook, Traverse — Rust like
appearance of second and third row seat frame
Prep and refinish seat components
Replace seat frame
Avalanche, Escalade, Escalade ESV, Escalade EXT,
Sierra, Silverado, Suburban, Tahoe, Yukon, Yukon
Denali, Yukon XL, Yukon XL Denali — Revised HVAC
blower motor installation instructions
Modify HVAC blower case to
accommodate new motor and
cooling duct
Replace HVAC blower case
Suburban, Tahoe, Yukon, Yukon Denali, Yukon XL,
Yukon XL Denali — Deformed or dimpled liftgate
center appliqué, liftgate paint damage evident at
lower outer edge of appliqué
Replace the appliqué with the new
design and shim if necessary
Over tighten the attachment
10212.03D Emerging Issues
Do This
Don’t Do This
March 8, 2012
To view Emerging Issues seminars:
Log in to, select Service Know-How/
TECHAssist from the menu, select Emerging Issues, and then
Searchable Streaming Video to choose the current Emerging
Issues seminar or past programs.
Customer Care and Aftersales
March 2012

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