August 2011Volume 13, No.8

The New 2012 Sonic . . . . . . . . . . . . . . . . . . .1SI Screen Characters . . . . . . . . . . . . . . . . . . .1SRX Reprogramming Updates . . . . . . . . . . . .3Compress Natural Gas Fuel Systems Training . . . . . . . . . . . . . . . . . . . . . .3Two-Mode Hybrid Electronic Brake Control Module DTCs . . . . . . . . . . . . .4Brake Pad Wear and Fit . . . . . . . . . . . . . . . . .4Coolant Leak from HVAC System . . . . . . . . .4Intermittent No Start Condition and Illuminated MIL . . . . . . . . . . . . . . . . . . . .5Air Trapped in Brake System . . . . . . . . . . . . .5Insufficient Windshield Washer Spray . . . . . .5Instant Update of the Ambient Temperature Sensor . . . . . . . . . . . . . . . . . . . .6Inoperative Fuel Gauge . . . . . . . . . . . . . . . . .6Sunroof Sunshade Relearn . . . . . . . . . . . . . . .7Inside Rear View Mirror Automatic Day-Night Feature . . . . . . . . . . . . . . . . . . . . .7Fog Lamp Operation . . . . . . . . . . . . . . . . . . .7Service Know-How . . . . . . . . . . . . . . . . . . . . .7Car Issues – Fix It Right the First Time . . . . .8Truck Issues – Fix It Right the First Time . . . .9

Customer Care and Aftersales

Contents

TECHLINEnews

Service Information (SI) users may notice improperly formatted screen characters when viewing diagnostic repair procedures. Screen character issues may be present when using eitherInternet Explorer (IE) 7 or 8. This issuemay cause screens to appear incompleteor confusing.

Review #PI0135A for some screen com-parisons to determine if your PC exhibitsthese symptoms using either versions ofInternet Explorer. Adjusting the settingsin Windows or the browser will enablethe information to be displayed properly.

At this time, General Motors doesnot recommend the use of Internet

Explorer 9. Techline applications will require some changes in order to sup-port IE 9. An announcement will be sentto dealerships when IE 9 is compatiblewith Techline software.

To view the GM Service InfrastructureGuidelines for the latest hardware andsoftware requirements, go to thewww.gmdesolutions.com website andselect the tab to "Techline IT Solutions"and the link "GM IT Standards." Dealersin Canada should refer to the GMCanada Dealer Infrastructure Guidelinesin the Service Library of GlobalConnect.

Thanks to Lisa Scott

SI Screen Characters

The New 2012 Sonic

The 2012 Chevrolet Sonic will be arriving in dealerships soon as a replacement for the Aveo. It’s an all-new entry in the sub-compact market.

The Sonic will be offered in two body styles — a four-door sedan and a five-door hatchback.

Powertrains

Both Sonic models are powered by efficient Ecotec 4-cylinder engines — a standard 1.8L engine and an optional 1.4L turbo engine — the same engines used in the new Cruze.

continued on page 2

The standard Ecotec 1.8L 4-cylinder engine is paired with the M26five-speed manual transmission or the Hydra-Matic 6T30 six-speed automatic transmission.

The naturallyaspirated 1.8Lengine gener-ates an esti-mated 135horsepoweralong with 125lb.-ft. of torqueat 3,800 rpmand features ahollow-framecast-iron cylin-der block anddual overheadcamshafts withvariable valvetiming for dura-bility and efficiency. Its two-stage variable intake manifold allowsapproximately 90 percent of peak torque to be available from2,400 rpm to 6,500 rpm.

A sportier option is the available Ecotec 1.4L turbocharged enginewith the M32 six-speed manual transmission.

The 1.4L turboengine is ratedat an estimated138 horse-power and 148lb.-ft. of torquebetween 1,850rpm and 4,900rpm. Premiumfeatures of theengine includedual overheadcamshafts withvariable valvetiming, chain-driven cams,roller-fingercamshaft followers, piston-cooling oil jets and integrated oil cooler,and a variable-flow oil pump.

The 1.4L engine’s turbocharger is integrated within the exhaust manifold, for reduced weight andgreater packaging flexibility.

Models with a manual transmission also feature Hill Start Assist(HSA). When stopped on a hill, HSA prevents the vehicle fromrolling before driving off, whether facing uphill or downhill, by holding the brake pressure (for up to two seconds) during the transition between when the driver releases the brake pedal andstarts to accelerate.

TIP: Hill Start Assist will not operate if StabiliTrak is disabled.

The electrical system of the Sonic features the Global A electricalarchitecture, which requires the use of the Global Diagnostic System (GDS) software and the Multiple Diagnostic Interface(MDI) tool.

Suspension

The ride and handling of the Sonic was a major focus for engi-neers. The body structure is designed to be one of the stiffest in

the segment, enabling the ride and handling to be tuned more precisely.

All models feature a MacPherson strut front suspension with coilsprings and a stabilizer bar, and a semi-independent, torsion beamaxle-mount compound link-type rear suspension with a robust, tubular V-shape beam and gas-charged shocks. The rear axle is astraight axle without contour for packaging restraints and reducednoise, vibration and harshness.

Electronic power steering and StabiliTrak electronic stability con-trol with rollover sensing are standard on all models. The column-mounted electronic power steering features a wear compensatorthat continually adjusts the system interaction with the steeringgear to ensure precise steering action over the life of the system.

On various models, 15-, 16- and17-inch alloy wheels are available.

Interior Features

The Sonic offers a number of convenience features, including a variety of ways for owners to stay connected. Available featuresinclude OnStar, XM satellite radio, USB and Bluetooth functional-ity and the MyChevrolet mobile application with OnStar Re-moteLink vehicle connectivity.

For operating portable audio devices, a 3.5mm auxiliary input jackis located on the radio. An optional second auxiliary input jack andUSB port are located in the instrument panel upper storage com-partment. Some supported devices can be recharged when con-nected to the USB port.

The instrument cluster continues the sporty styling theme witha motorcycle-inspired large, round analog tachometer set withinan asymmetrical LCD readout, with a large digital speedometerdisplay.

The Driver Informa-tion Center featuresa Trip/Fuel menu anda Vehicle Informationmenu, which includeitems such as tirelearn, remaining oillife and fuel econ-omy. Pressing theMenu button on theturn signal lever switches between the two menus displayed onthe instrument cluster. Rotating the arrow switch on the turn signallever displays the various items of each menu.

To reset the trip odometer, press the Menu button to display theTrip/Fuel menu and then rotate the arrow switch to highlight thetrip odometer. With the odometer flashing, press the reset stemon the tachometer on the instrument cluster to reset it.

Comprehensive safety features on the Sonic include 10 standardair bags, antilock brakes, electronic brake force distribution andbrake assist, and OnStar with Automatic Crash Response.

Service Training

Several service training courses on the Sonic will be available, including:

• 10211.13W – Chevrolet Sonic New Model Features (U.S.)

• 50535.09W – Chevrolet Sonic New Model Features (Canada)

Go to www.gmtraining.com (or www.gmprocanada.com in Canada)for more information.

Thanks to Hassan Abdallah

2 August 2011

The New 2012 Sonic – continued from page 1

1.4L 4-cylinder turbo

1.8L 4-cylinder engine

August 2011 3

Recent service updates on the 2010-2011 SRX require reprogramming the Sensing and Diagnostic Module (SDM) andEngine Control Module (ECM). The SRX has unique Global A programming characteristics. Review the following programmingtips and incorporate them in your programming best practices.To ensure a successful programming event, it’s important that nosteps are missed.

Before Programming

TIP: Ensure the vehicle to be programmed meets the bulletincriteria before beginning programming.

Proper battery voltage — Just because the vehicle was justdriven in, doesn't always mean it has adequate battery voltage.To maintain proper battery voltage during programming, connectthe Midtronics PSC charger or GR8 battery tester/charger tothe vehicle. Insufficient battery voltage can cause programming tofail or the Multiple Diagnostic Interface (MDI) to unexpectedly loseits connection.

Connectivity toTIS2Web, MDI andthe vehicle — TheTechline PC musthave a reliable con-nection to TIS2Weband the MDI must beproperly connected.A USB connectionmay be the bestchoice when pro-gramming multiplecontrol modules.

Proper ignitionswitch position —Be sure the ignition is

in the ON (or RUN) mode with the engine off. The SRX isequipped with a push button start ignition. Push button ignitionscan be difficult to put in the ignition ON, engine OFF mode.

TIP: Look for a full gauge sweep on the IPC, and lightsON warning.

To put the ignition in this mode, press and hold the Start/Stop button (without pressing the brake pedal) for a minimum of 10 seconds. The instrument cluster will turn on, with a full gaugesweep and the Cadillac crest displayed on the Driver InformationCenter. The green LED indicator on the Start/Stop button will illuminate. Once the ignition is ON, begin the module set-up procedure.

After Programming

Programming and Setup are two different procedures —After reprogramming the SDM, an SDM Setup procedure must be performed. Also, an ignition Power Mode cycle must be performedduring the SDM procedure. The ignition must be in the ON position; otherwise, the setup procedure will fail.

If programming stops or fails — In the event that programmingis interrupted or fails, DO NOT replace the control module. Thereare steps that can be taken in order to recover the control module.If unsuccessful, contact the Techline Customer Support Center(TCSC) at 1-800-828-6860 (French: 1-800-503-3222).

Before calling the TCSC, be sure to have:

• Dealer information (BAC Code)

• VIN of the vehicle being reprogrammed

• Reason for the reprogramming procedure

• Any displayed error messages

• Close proximity to the Techline PC and vehicle

Thanks to Mike Waszczenko

SRX Reprogramming Updates

Put the ignition in the ON mode with theengine off. The green LED indicator

on the Start/Stop button will illuminate.

Compressed Natural Gas Fuel Systems TrainingCompressed Natural Gas (CNG) Training course 16240.62W is nowavailable on www.gmtraining.com (U.S. only). The Web-based Train-ing (WBT) course covers the operation and service of the CNG fuelsystem available in the 2011 Express and Savana cargo vans.

The course reviews the information necessary for service techniciansto identify and describe the components, system operation and diagnostics of the CNG fuel system. In addition, proper refueling procedures are presented along with information related to CNG tank inspections, federal laws and government regulations for all GMCNG vehicles.

Updated Procedure

The fuel tank venting procedure in the course content instructs thetechnician to use the Tech 2 to energize the fuel pump relay. TheService Information has been updated since the course was releasedto the following more efficient procedure:

• Use a fused jumper wire to jumper the fuel pump relay terminals 30 to87 to begin the venting process.

The CNG fuel tank is completely vented when venting gas flow is nolonger audible from the vent stack.

CNG Training course 16240.62W

If ambient temperature is lower than 45°F (7°C), warm thefuel tank and vent assembly by placing in a warm environ-ment or spraying with warm water.

Thanks to Chris Graham

4 August 2011

DTC C0561 may be set in the Electronic Brake Control Module(EBCM) on some 2009-2011 Escalade Hybrid, Silverado Hybridand Sierra Hybrid models; and some 2008-2011 Tahoe and YukonHybrid models. These models feature the Two-Mode Hybrid System (RPO HP2).

A Service Stability message will be displayed on the Driver Information Center as a result of DTC C0561. It may be difficult toclear DTC C0561 sym4B or C0561 sym71 from the EBCM.

TIP: Do not replace the EBCM. Address any DTCs in all modules before trying to clear DTC C0561.

Brake BleedProcedures

If either of the DTCs are set-ting after the brake hydraulic system was opened or if theDTCs set on a vehicle that stillhas low mileage, run the Anti-lock Brake System AutomatedBleed procedure outlined inService Information (SI) Document ID: 2162047.

If the procedure was runonce already and DTC C0561sym4b resets, run the BrakeHydraulic and Assist System Diagnosis (Two-Mode Hybrid) procedure in SI Document ID:

2203427 prior to replacing any parts.The procedure mayneed to be run morethan one time if theprocedure is not followed completelyor if the incorrectbrake bleed equip-ment is used.

The recommended special tools are:

• J 35589-A BrakeBleeder Adapter, or equivalent

• J 29532 Diaphragm Pressure Bleeder or J-29532-A Brake Pressure Bleeder, or equivalent.

EBCM Relearn Procedure

If there are no longer any codes in any modules, perform theEBCM Relearn procedure outlined in #PIT4563F.

TIP: The Brake Pressure Modulator Valve (BPMV)/EBCM assembly must be at least 32° F (0° C) orwarmer before performing the set-up procedures. Use a contactthermometer or an infrared temperature gun to measure the temperature.

Thanks to Brian Ciaverella

Two-Mode Hybrid Electronic Brake Control Module DTCs

Brake Pad Wear and Fit

J 35589-A Brake Bleeder Adapter

J 29532 Diaphragm Pressure Bleeder

On some 2005-2010 Cobalt, 2005 Pursuit (Canada only), and2006-2010 G5 models, the inner rear brake pads may have unevenwear and/or the innerpad may not fit prop-erly. These conditionsmay occur after thevehicle has had therear pads replaced.

The excessive wear onthe rear inner brakepads and the appear-ance of improper fitmay be due to thepads being incorrectly installed.

The inner and outer pads can be distinguished by an anti-rattlespring and the locatingpins. The inner pad hasan anti-rattle spring attached to it and the locating pins areplaced side-to-side.The outer pad doesnot have an anti-rattlespring and the locatingpins are placed top-to-bottom. Check thatthe correct pad is used before installation.

Thanks to Ernest Haller

Inner rear brake pad with the anti-rattle spring and the locating pins

placed side-to-side.Outer rear brake pad with the

locating pins placed top-to-bottom.

If there is an engine coolant odor in the interior, an engine coolant loss, or if the inside of the windshield is fogging on some2010-2011 Camaro models, there may becoolant leaking from the HVAC system.Follow the published Loss of Coolant

inspections as outlined in the Service Information to determine the origin ofthe leak.

TIP: Due to the complexity of heatercore replacement, it’s important to verify

that engine coolant is leaking from theheater core before beginning any heatercore repairs.

Thanks to Jeremy Richardson

Coolant Leak from HVAC System

August 2011 5

Intermittent No Start Conditionand Illuminated MIL

Air Trapped inBrake System

On the 2011 Cruze, some of the following conditions may be present:

• An intermittent No Crank/No Start condition

• Intermittent ABS, Traction Control System (TCS)/StabiliTrak Malfunction IndicatorLamp (MIL) illumination

• Intermittent Driver Information Center service messages being displayed: ServiceStabiliTrak or Service Traction Control.

Any of the following DTCs also may be set: C0186, C0196, C0035, C0040, C0045,C0050, C0710, C0800, U0073, U0121, U0125, U0126, U0140, U0155, U0173,and U0174.

If these conditions arepresent, check for excessive wire tension atthe Electronic Brake Control Module (EBCM)connector. Remove theEBCM harness connectorbody wire dress coverand inspect for sufficientwire harness length intoeach respective terminalcavity. This inspectionmust be performed by re-installing the connec-tor on the EBCM. Inspecteach respective circuitwire length. It should berelaxed entering the terminal cavity and not under any tension.

In addition, for a No Crank/No Start condition, inspect the EBCM connector for possible poor or low drag terminal tension on the High-speed Bus respective circuits(Terminals 9, 10, 11, and 12). Replace all terminals that are found to have low drag ortension.

For intermittent ABS, Traction Control System and StabiliTrak lamp illumination, inspectthe EBCM connector for possible poor or low drag terminal tension on all EBCM circuits (including Power & Grounds). Replace all terminals that are found to have lowdrag or tension.

Reference the Service Information Component Connector End Views – K17 ElectronicBrake Control Module for test probe and replacement terminal part numbers.

If the EBCM wiring harness passes all inspections, perform the same inspections onthe remaining High-speed Bus communication circuits 2500 & 2501, including the Engine Control Module (ECM), Body Control Module (BCM), Fuel Pump Control Module (FPCM), Power Steering Control Module (PSCM), and Transmission ControlModule (TCM).

Thanks to Christopher Hightower

On the 2006-2011 Impala and 2006-2007 Monte Carlo, it may be difficultto remove all the air from the brakesystem after a hydraulic componentdisconnect or replacement.

The brake lines between the mastercylinder and the ABS module arerouted higher than the master cylinder reservoir. If air gets intothese lines, due to a component disconnect or replacement, it will riseto the high point in the lines. Extrasteps must be taken to purge all ofthe air from the lines.

To purge air from the brake lines:

1. Carefully loosen the fittings on thelines between the master cylinderand the Brake Pressure ModulatorValve (BPMV) just enough to beable to rotate the lines temporarilybelow the fluid level of the reservoir,then tighten the fittings. There is aflexible portion in each of theselines, which makes repositioningpossible.

TIP: Loosen the fittings justenough to allow the lines to move, notenough to allow air to enter.

2. Perform the bleed procedure. Bleedthe left front/right rear diagonal pairof wheel cylinders, followed by theright front/left rear diagonal pair ofwheel cylinders. This increases fluidflow to assist in purging air fromthe lines.

TIP: Use a GM-recommendedpressure bleeder to bleed the brakes.

3. When the bleed procedure is com-plete, carefully loosen the fittings onthe lines repositioned earlier. Movethem back to their original positionsand retighten.

Thanks to Dave Eplin

Insufficient Windshield Washer SprayOn some 2002–2009 TrailBlazer, Envoy; 2002–2007 Rainier; 2002-2004 Bravada; and 2005–2009 Saab 9-7X models, the windshield washers may be inoperative or have insufficient fluidspray. This may be caused by plugged washer nozzles and a contaminated washer reservoir.

If debris is left in the reservoir, it may cause the system to becomeplugged. The source of the debris is typically from a loose or unfastened cap after a fluid refill.

If the system is plugged, first remove the washer reservoir, removeall fluid from the reservoir and wash it out. The nozzles also mustbe replaced. There is a filter in the nozzles, so blowing them outwill not clear them properly. Before installing new nozzles, fill thesystem and flush the system by activating the washer to clean outthe pump and lines.

Thanks to James Miller

K17 Electronic Brake Control Module connector

6 August 2011

The ambient temperature display may be slow to update the out-side temperature at times or the A/C compressor may not operate due to low ambient temperature on some 2008-2012 En-clave; 2009-2012 Traverse; 2007-2010 OUTLOOK; 2007-2012Acadia, Escalade, Escalade ESV, Escalade EXT, Avalanche, Silver-ado, Suburban, Tahoe, Sierra, Yukon, Yukon Denali, Yukon XL, andYukon Denali XL models.

The outside air temperature display utilizes a very specific filteringroutine of the Ambient Temperature Sensor signal so the displaywill update gradually without making large jumps in the reading.This is designed to eliminate the possibility of erratic readingsunder certain driving conditions.

The temperature display is always allowed to update quickly whenthe ambient temperature is getting colder while driving, but thedisplay takes much longer to update when the temperature is get-ting warmer. This prevents false updates to the temperature dis-play while driving in slow or stop-and-go traffic in hot weather.

The temperature display will always read the actual ambient tem-perature when the vehicle is started if the temperature hasdropped since the last key cycle. It will not immediately update tothe actual ambient temperature if it has gotten warmer since thelast key cycle unless the ignition has been off for at least 2.5hours.

Instant Update

If an owner has a concern with the function or accuracy of the ambient air temperature display, perform the instant update to

determine if the display will read an accurate temperature.

To perform an instant update of the Ambient Temperature Sensor,simultaneously press and hold the Recirculation button and A/Cbutton on the HVAC control head. It is also possible to performthe instant update by using a scan tool in the special functionmode and selecting instant OST update. Within a few seconds,the Driver Information Center should display the current tempera-ture.

If the instant update creates an accurate reading, do not replacethe Ambient Temperature Sensor.

Explain to owners how the system is designed to filter the ambienttemperature sensor reading to prevent erratic readings in temper-ature.

A/C Compressor Operation

Additionally, when diagnosing an HVAC system concern, keep inmind that the A/C compressor will not engage when the ambienttemperature is too low as determined by the Ambient TemperatureSensor.

The A/C compressor is disabled in temperatures below 36° F (2° C). Typically, this will occur when the vehicle is parked outsidein temperatures below 36° F (2° C) and then brought into the service center. Since the ambient temperature does not update instantly, it will be necessary to perform an instant update ofthe Ambient Temperature Sensor in order to proceed with any diagnostics.

Thanks to James Miller

Inoperative Fuel GaugeAn inoperative fuel gauge that is stuck on E (Empty) with a fulltank of fuel on some 2005-2010 Cobalt, 2005 Pursuit (Canadaonly), and 2006-2010 G5 models may be the result of overfillingthe fuel tank. With this condition, DTC P0461may set in the ECM.After clearing the code, the fuel gauge will begin to read correctly.

Do not replace any parts for this condition without verifying howthe fuel tank is being filled and how often the vehicle is refueled.Review this condition with owners. It can be induced in the follow-ing ways:

• If the owner overfills the fuel tank to the point where the ECM/PCM cannot indicate a 1.6% drop in fuel within 120 miles (193 km)of driving, the DTC will set and the fuel gauge will default to E.

• If the owner fills the vehicle too frequently (before the fuel gaugereading starts to drop), the ECM/PCM cannot indicate a 1.6% dropin fuel within 120 miles (193 km) of driving. The DTC will set andthe gauge will default to E.

To prevent the fuel gauge from defaulting to E, inform the ownerto avoid overfilling the fuel tank by stopping the pump afterit clicks off. In addition, do not fill the vehicle until the fuelgauge drops below Full or the vehicle is driven more than 120 miles(193 km).

Thanks to Ernest Haller

Instant Update of the Ambient Temperature Sensor

August 2011 7

GM TechLink is a monthly magazinefor all GM retail technicians andservice consultants providing timelyinformation to help increase know ledgeabout GM products and improve theperformance of the servicedepartment.

Publisher:Thomas J. Arnold

GM Customer Care and Aftersales /Thomas.Arnold@GM.com

Editor:Lisa G. Scott

GM Customer Care and Aftersales /Lisa.G.Scott@GM.com

Technical Editor:Mark Spencer

/mspencer@gpworldwide.com

Production Manager:Marie Meredith

Desktop Publishing:5by5 Design LLC

/dkelly@5by5dzign.com

FAX number: 31-248-729-4704

Write to: *TechLinkPO Box 500Troy, MI 48007-0500

GM TechLink on the Web: :GM GlobalConnect

General Motors service tips are intendedfor use by professional technicians, not a“do-it-yourselfer.” T hey are written toinform those technicians of conditions thatmay occur on some vehicles, or to provide information that could assist in the properservice of a vehicle. Properly trainedtechnicians have the equipment, tools,safety instructions and know-how to do ajob properly and safely. If a condition isdescribed, do not assume that theinformation applies to your vehicle or thatyour vehicle will have that condition. See aGeneral Motors dealer servicing yourbrand of General Motors vehicle forinformation on whether your vehicle maybenefit from the information.Inclusion in this publication is not necessarily an endorsement of theindividual or the company.

Copyright© 2011 General Motors All rights reserved.

ServiceKnow-How

10211.08D Emerging Issues

To view Emerging Issues seminars:Log in to www.gmtraining.com, select Service Know-How/TECHAssist from the menu, select Emerging Issues, and thenSearchable Streaming Video to choose the current EmergingIssues seminar or past programs.

August 11, 2011

When attempting to close the sunroofsunshade on the 2010-2011 LaCrosse, ifit closes approximately half way and thenstops, it may need to be reprogrammed.

Using GDS 2, select Module Diagnostics> Body Control Module > Data Display.From the Select Data List Menu at the topof the page, select Sunroof Data from thedrop down menu. Review Sunroof Positionfrom the data list, which will indicate theactual position of the sunroof.

If the Sunroof Position from the data listdoes not indicate the correct position, perform the Sunroof Motor/Actuator Initialization/Teach Process (ExistingMotor) following Service Information Document ID: 2236268.

Once the relearn has been completed, thesunroof sunshade should close properly.

Thanks to Christopher Crumb

Sunroof Sunshade Relearn

The inside rear view mirror on the 2009-2012 Malibu has an automatic day-nightfeature that can be turned on or off.

To enable or disable the automatic day-night feature of the inside rear view mirror,with the ignition in the On position, depress and hold the on/off button on themirror for six seconds. A green indicatorwill illuminate on the mirror when the automatic day-night feature is enabled.

To disable the automatic day-night feature,depress and hold the on/off switch for sixseconds again.

Be sure to inform owners of the length ofthe button press in order to enable or disable the automatic day-night feature.Information in the Owner Manual may beincomplete.

Thanks to Chris Hightower

Inside Rear View Mirror Automatic Day-Night Feature

2010-2012 Camaro models equipped withHID Headlamps (RPOT4F) have Daytime Running Lamps (DRLs)in place of the fog lamps.This information is calledout in the Owner Manual.If an owner commentsthat the fog lamps are inoperative, before mak-ing any repairs, checkthat the vehicle isequipped with fog lamps,not the DRLs.

Owners who would like to have fog lamps added to a vehicle that was not originally builtwith fog lamps should be informed that GM does not offer an approved fog lamp kit forthese vehicles.

Thanks to Jeremy Richardson

Fog Lamp Operation

8 August 2011

Car Issues – Fix It Right the First Time

ModelYear(s) Vehicle Line(s)/Condition Do This Don’t Do This Reference

Information/Bulletin

2011 CTS, CTS Coupe, CTS Sport Wagon –Differential gear whine or pinion gear whinefrom rear axle

Order the isolator kit P/N22822498

Order WPC 591 PI0350C

2010-2011 Malibu – Power steering or DIC Reduced Powermessage, DTC C0475 or P2138 set

Check that water leak is not thecause for DTC C0475 and/orP2138

Overlook water leaks as acause

PI0116A

2011 Acadia, Avalanche, Canyon, Colorado, Corvette,Escalade, models, Express, Impala, Malibu,Savana, Tahoe, Traverse, Yukon models – DTCsP0442, P0446, P0455 or P0449 set; Corrosion atEVAP CVS Valve electrical terminals, Fuel tankhard to fill

If corrosion is present inconnector, clean or replaceconnector and apply dielectricgrease

Repair without correctingcorrosion

PI0493

2011 Cruze – Intermittent trunk inoperative, DTCB3618

Replace rear license plate lampwire harness

Adjust or replace rearstriker or latch assembly

PI0492

2011 Impala – ABS and Traction Control light On Check wiring problem areas Replace EBCM PI0490

2006-2012 All Vehicles – Interior cleaning productavailability

Vacuum loose dirt as first step incleaning

Replace dirty parts thatcould be cleaned

06-00-89-029G

2009-2011 Lucerne – Noise when shifting from Park toReverse or Drive, Noise in power steeringsystem

Inspect/replace the front enginemount if separated. Inspectpower steering fluid reservoir forsigns of leaking

Replace the powersteering reservoirwithout looking at thefront engine mount forseparation

PI0487

2011-2012 Caprice PPV – USB Diagnostic Cable EL 50334-10 required when reprogramming radio

Purchase USB Cable and performradio programming

Replace radio forsoftware updates

PI0485

2011-2012 Corvette – Thin finish in lug nut recesses onoptional gloss black wheels

Brush paint the lug nut opening Replace the wheel PI0484

2010-2011 Malibu – Water leak into footwell or within IPand/or lower dash panel insulators

Review bulletin when diagnosinga 2010 or 2011 water leak

Overlook water leaks inthe roof ditch area

PI0096A

2011 Camaro – Wind noise from front door glass athighway speed

Reposition the convertible topside tension cable

Replace the front railweatherstrip

PI0482

2008-2011 Camaro, Caprice PPV, Cruze, Equinox, G8,LaCrosse, Regal, Terrain, Volt – Key cuttingprocedure for obtaining replacement key

Information update only Information update only 09-00-89-029G

August 2011 9

Truck Issues – Fix It Right the First Time

ModelYear(s) Vehicle Line(s)/Condition Do This Don’t Do This Reference

Information/Bulletin

2008-2010

VUE – Information on air conditioningcompressor replacement from 1st design to 2nddesign

When installing a 2nd designA/C compressor,replace/modify allcomponents called out in thebulletin

Replace the compressorwithout additional partsrequired

11-01-37-002

2003-2009

Express, Savana – Release of steering linkageinner tie rod kit for service

Replace the inner tie rods Replace the complete rack PI0495

2007-2011

Acadia, Enclave, Outlook, Traverse – Lowercontrol arm bushing squeak when warm

Replace the bushing Replace the lower controlarm

PI0251A

2010-2011

Avalanche, Sierra, Silverado, Suburban, Tahoe,Yukon; Yukon Denali, Yukon XL, Yukon XLDenali – Reduced window clearing, non-responsive HVAC Control

Reflash HVAC module Replace module or actuators 11-01-38-001A

1999-2012

Sierra, Silverado – Noise from underbody overbumps

Replace with new designcable

Apply grease 11-08-61-002A

2005-2012

Canyon, Colorado – Excessive blower motornoise on low speed

Evaluate the source of thenoise. If the HVAC blowermotor has excessive noise,install the recommendedinsulator cover

Replace the HVAC blowermotor

06-01-38-001D

2011 Sierra, Silverado – Instrument panel clusterwarning lamps/MIL illuminated, DEF messagedisplayed, various DTCs set, transmission maynot shift or defaults to second gear

Repair wiring or connector Replace components PI0339A

2007-2010

Equinox, Torrent, VUE – Information onindividual steering column part componentavailability

Replace the steering columnassembly (minus motor andECU)

Replace the steering columnassembly kit

PI0440A

2008-2009

Escalade, Tahoe, Yukon – Transmission shudderor bucking feel

Replace the pressureregulator valve inner spring

Replace transmission 09-07-30-001C

Customer Care and Aftersales